Specimens from the area of intergradation vary more individually in many features than do specimens from other areas.
Specimens from Pratt County are slightly darker than industrius thereby indicating intergradation between industrius and major.
Intergradation of this kind here is accepted as the criterion of subspecies, and lack of such intergradation as the criterion of species.
If so, the actual intergradation may be to the northwest via Pratt County since specimens from Barber County, immediately west of Harper and lying between Harper County and the range of industrius, do not have the occiput so inclined.
However, with only a skin available, we, too, would have used the name jugossicularis because the color is paler than in other specimens of industrius and this paleness indicates intergradation between the two named subspecies.
Therefore, the color and size probably are indicative ofintergradation between jugossicularis and major.
The reason for arranging all of the named kinds as subspecies of a single species is that intergradation has been found to occur between every pair of kinds having contiguous geographic ranges.
Detailed comment on specimens showing intergradation are to be found in the accounts of G.
Farther southward they become progressively smaller in eastern Kansas, and we interpret this as intergradation with the still smaller subspecies major, to the southwest.
Probably the appearance in dilute fashion of this character in Harper County is properly to be interpreted as intergradation with industrius.
In doing so we recognize that intergradation ultimately may be found between the two species C.
He remarked also that specimens of the House Finch from the Sierra del Carmen seem to show no intergradationtoward frontalis.
Specimens from different localities in the State represent various stages of intergradation between the two subspecies; generally those from northern Coahuila seem to be closer to T.
Saltillo seems to be "very close to castanogastris, suggesting that southeastern Coahuila is in the region ofintergradation between the two races.
More collecting is necessary for an understanding of the distribution and intergradation of these subspecies in Coahuila.
The specimen shows evidence ofintergradation with excubitorides.
These specimens of the Ladder-backed Woodpecker show signs of intergradation with D.
The distribution and intergradation of Boat-tailed Grackles in Coahuila is presently poorly understood.
The specimen is in worn plumage, but nevertheless suggests intergradation with D.
Coahuila are too few to show clearly the distribution and intergradation in Coahuila.
This suggestion of intergradation is not unexpected because symplectus occurs in northeastern Coahuila and cactophilus in the Chisos Mountains of Texas.
Intergradation with Zapus hudsonius alascensis is noted also in specimens from McIntyre Creek, Yukon.
There is intergradation with Zapus princeps idahoensis in color, shape and size of incisive foramina, and in the shape of the nasals in Idaho-taken specimens from Glidden Lakes and Enaville.
These workers remark that no intergradation was apparent between individuals of the two species obtained in the same trap line.
Intergradation with Zapus princeps idahoensis and Zapus princeps cinereus is discussed in the accounts of those subspecies.
Yukon Territory, and seems to be the result of intergradationbetween Zapus hudsonius hudsonius and Z.
Intergradation with Zapus hudsonius acadicus occurs in southeastern New York as indicated by a series of 25 specimens from Peterboro.
Intergradation is noted with Zapus hudsonius pallidus and is discussed in the account of that subspecies.
Intergradation occurs with Zapus princeps idahoensis at various localities in Montana, as is described in more detail in the account of idahoensis.
British Columbia, show intergradation in shape of auditory bullae, in breadth of pterygoid fossae, and in shape and size of antorbital foramina between Z.
S of the junction of the same rivers, three way intergradation occurs.
Intergradation occurs at almost all of the places where the range of Z.
The lines between these subspecies are difficult to establish because the zones of intergradation are broad.
But the skull from Miquihuana yielded measurements that suggest intergradation between F.
Intergradation between the two takes place at Soto la Marina.
This difference in color suggests intergradationat this place between C.
None of the specimens suggests intergradation in color between nivalis and longala, but some are slightly larger than specimens of the former from Veracruz.
The small size suggestsintergradation between the subspecies collinus and eremicoides.
In measurements, the Tamaulipan specimens agree closely with miradorensis; in color, some resemble miradorensis but others approach fuscus, possibly indicating intergradation between the two subspecies in the material at hand.
The measurements of nine birds which show intergradation between G.
In dealing with insular forms the criterion of intergradation as indicative of subspecies cannot be applied as it can in kinds of birds on the mainland which have geographically continuous distributions.
Until intergradation is actually demonstrated, it seems best to use the name D.
The shorter tooth-row at the lower elevation (TacAimbaro), we interpret asintergradation with Oryzomys couesi mexicanus.
No well-defined belt of intergradation exists, but the transition extends over more than a thousand miles, with local populations somewhat isolated and slightly differentiated along divergent lines.
Consequently one would expect no intergradation between the coastal and desert races in the San Gabriel Mountains.
Although I collected no specimens from Cajon Pass or the passes at the west end of the range, it is in these places that intergradation might be expected to occur between the desert race C.
San Gabriel Mountains, with intergradation taking place in the Cajon Pass area and probably also at the west end of the Mountains.
Intergradation in color between the two subspecies levipes and beatae is seen in specimens from Jalapa and Zacualpan (3 km.
Intergradation between these two subspecies possibly will be found elsewhere along the Sierra Madre Oriental.
Intergradation undoubtedly connects the four races of the Mountain Chickadee into a continuous series of forms.
It is clear that intergradation between Penthestes gambeli gambeli and any one of the other three subspecies is less well established than between any two of these other three.
The line of intergradation extends to the coast, and birds showing various combinations of the two types from the Calcutta district exist in collections.
The only example I have met with of the phenomenon of anything like a complete intergradation between local types really distinct in kind is that provided by the butterfly Pararge egeria.
Animals from Toulon, Nevada, in the inflation of the auditory bullae, the vault of the braincase, the color and the total length show intergradation with D.
In specimens from 5 miles east of Abiquiu, New Mexico, three-way intergradation occurs.
Intergradation with Dipodomys ordii utahensis is noted in color and intermediacy of body size of specimens from Clover Creek.
Intergradation occurs in animals from the southern end of Pyramid Lake, Big Smoky Valley and near Toquima Peak, Nevada; these animals, although typical of D.
Although intergradation is not known to occur with other kinds, differentiation has not progressed far enough for these animals to be recognized as a distinct species.
Specimens taken at Lynndyl and Hinckley show intergradation in size of body, length and configuration of the nasals and the degree of inflation of the auditory bullae between Dipodomys ordii celeripes and D.
This intergradation is noted between Dipodomys ordii monoensis and D.
Ten miles southwest of Quemado and at Riley, New Mexico, intergradation with Dipodomys ordii ordii occurs in the shape of the nasals and the intermediate size of the skull.
Consequently it is unlikely that intergradation with other populations could exist at the present time.
Possibly it is noteworthy that the specimens from Las Animas are larger than Hooper's holotype and one topotype; this larger size is indicative of intergradation with G.
In this area, therefore, the zone of intergradation between the smaller lowland shrew and the larger montane shrew is more gradual and gradually intergrading populations are found over a relatively large area.
West of the Cascades no evidence of intergradation has been found and the two kinds occur almost side by side and maintain their distinctness.
Idaho to British Columbia; no intergradation and complete sympatry with all the other races of Sorex vagrans from the Cascades to the coast and south to San Francisco Bay.
In the deer mouse, Peromyscus maniculatus, the geographic ranges of several pairs of subspecies meet at certain places without intergradation of the two kinds.
Different degrees of differentiation thus obtain between the subspecies vagrans as here defined and the surrounding subspecies of Sorex vagrans to wit: complete intergradation and allopatry in Utah with S.
This intergradation is seen in populations from several localities in Utah.
Some specimens of obscurus from western Montana show evidences of intergradation with S.
In Utah, as previously pointed out, complete intergradation occurs.
Where some intergradation has occurred the result often has been increased size of the lowland shrews, although they usually retain the reddish summer pelage rather than acquiring the more grayish pelage of obscurus.
In Montana extensive intergradation occurs in a broad zone of transitional habitat.
In areas where individuals of obscurus show intergradation with vagrans, Sorex cinereus is absent or rare.
In western British Columbia, Washington, and Oregon no evidences ofintergradation between S.
Owing to the abrupt change in elevation, the zone of intergradation is rather narrow horizontally.
Perhaps there is intergradation between pallidus and hartwegi in the intervening streams.
For convenience, all softshells having locality data from states east of the Mississippi River are referred to spinifer, recognizing that intergradation occurs with hartwegi over a broad area paralleling the Mississippi River.
There is no evidence of intergradation or hybridization.
In the early stages of this study, I thought that the pattern on the carapace differed in eastern and western populations, and that the zone of intergradation was in Alabama.
Actually, they are from an area of intergradation between those subspecies (see comments concerning intergradation under the accounts of the subspecies pallidus and guadalupensis).
There are no specimens that indicate intergradationbetween calvatus and muticus; calvatus is expected in streams that drain into Lake Pontchartrain, Louisiana.
Intergradation does not occur between these two species, for, low-lying terrain, inhospitable to chipmunks, isolates E.
I suppose there is no intergradation but in the absence of precise information, I choose not to modify the current taxonomic arrangement of E.
Uncommon resident in the pinon-juniper association of southern Idaho.
Crosshatching indicates the area of intergradation between the eastern and western subspecies.
The two kinds obviously are closely related and intergradation eventually may be demonstrated between them.
But, for the present, we adopt a conservative course and treat evotis as a full species owing to its distinctive features, restricted geographic distribution, and the lack of evidence of intergradation between it and crawfordi.
There is thus a broad zone of intergradationin color and the line separating the subspecies must be drawn somewhat arbitrarily.
If intergradation occurs in Arizona between the species Sylvilagus floridanus and Sylvilagus nuttallii, as Nelson (op.
The lateral inflation of the tympanic bullae can be interpreted as intergradation with the geographically adjacent S.
These animals show definite evidence of intergradationwith the larger subspecies, S.
Some of the specimens taken between Summit Pass and Toad River show evidence of intergradation between the paler and grayer E.
Specimens from the vicinity of Haines, Alaska, are slightly darker indicating intergradation with P.
The pallor of some shrews from east-central Alaska (Chatanika River and Salcha River) suggests intergradation with the pale S.
Glave) show evidence of intergradation with the coastal subspecies, S.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "intergradation" in a variety of sentences. We hope that you will now be able to make sentences using this word.
