These moths have rudimentary mouth organs, and eat no food in the imago state.
Defn: Of, pertaining to, or designating, a condition assumed by the imago of certain Neuroptera, after exclusion from the pupa.
Defn: The pupa of insects which undergo only a slight change in passing to the imago state.
Near the close of the last century, John Abbot went from London and spent several years in Georgia, rearing the larger and more showy butterflies and moths, and painting them in the larva, chrysalis and adult, or imago stage.
This egg-parasite passes its early life in the eggs of Pieris brassicæ, and two or three live to reach the imago state, though about six eggs are deposited by the female.
Here it is necessary to disabuse the reader's mind of the prevalent belief that the terms larva, pupa and imago are fixed and absolute.
The pupa state lasts for five or six days, and when the imago appears it eats its way through a small round opening in the end of the skin of its host, the Agrion larva.
The imago is produced beneath the surface of the water, its fine silky covering serving to repel the action of the water.
Other insects hibernate in the adult or imago form, either as beetles, butterflies or certain species of bees.
When full-fed and ready to pass through their transformations to attain the beetle state, instead of at once assuming the pupa and imago forms, as in the Trichodes represented in fig.
So slight are the differences between the different stages that it is difficult to say where the larval stage ends and the pupa begins, so also where the pupal state ends and the imago begins.
By turning the stubble with the plough in the autumn and early spring, its imago may be destroyed, and thus its ravages may be checked.
Here we shall conclude the external anatomy of the insect, in the imago state.
But in the imago state the pulse appears to move much quicker: and it is easy to make an insect's beat extremely fast, by exciting or provoking it.
Six is the true number of legs which belong to the insect in the imago state.
Hence it follows that our pulse beats about twice as fast as that of an insect in the larva state: in the imago state it is probably, as a general rule, at least in winged, active insects, higher than ours.
All perfect insects are provided with compound eyes, and a large number with simple eyes too; but no imago or perfect insect has simple eyes alone.
Schirach asserts, that in cold weather the disclosure of the imago takes place two days later than in warm: and Riem, that in a bad season the eggs will remain in the cells many months without hatching.
The workers also clean the cells and prepare them to receive another egg, after the imago is disclosed and has left it.
With this, however, strictly accords their hybernation in the larva and imago states, in which their abstinence from food is solely owing to the torpor that pervades them, and the consequent non-expenditure of the vital powers.
As has already been stated, the imago of the rare D.
The imago of Smerinthus Juglandis differs considerably from S.
Thus, a few species can be found in which the larva and pupa are constant and the imago variable.
Cases in which the variability depends entirely upon the pupa, while the larva and imago are extremely constant, are of great rarity.
To this class, for example, belongs Smerinthus Tiliæ, of which the larva and imago are very variable, whilst the pupa is quite constant.
But much weaving of destiny, many encounters, and an abundance of ordeals will be requisite, ere the multicolored and impressive imago will emerge from the obscurity of these first intimations.
Through all these long years his cloistered labors represented the hidden stage of the chrysalis, from which the imago is to issue in winged glory.
It is the full-grown larva, however, which corresponds most nearly to the adult Myriopod, while the pupa and imago are stages peculiar to the Insect.
Enough interest was excited by the Traité Anatomique to call for the fulfilment of a promise made in the preface that the description of the pupa and imago should follow.
But these remarkable changes are surely secondary, adaptive, and peculiar, like the footless maggot itself, whose conversion into a swift-flying imago renders necessary so complete a reconstruction.
This species probably hibernates in the imago state during the winter months, as we may often observe specimens abroad on mild evenings, at that season.
Imago with fore-wings more or less elongate-triangular, hind-wings ovate, often rather small.
Imago with fore-wings usually relatively broader and less elongate than in the Caradrinidae, body often more slender.
It appears to pass the winter in both the pupa and imago states.
This interesting species is seldom seen as an imago in the natural state, although the cases constructed by its larva are of common occurrence.
Its extreme abundance and great variability, in both the larval and imago states, would render it a good subject for a series of experiments, resembling those conducted by Messrs.
Imago usually with a horny apical hook on anterior tibiae.
Imago with fore-wings and hind-wings more or less semi-oval, termen and dorsum forming a nearly uniform curve.
Imago with fore-wings more or less broad-triangular; hind-wings broad-ovate.
Both larva and imagoare protected by a strong nauseous scent, or taste, and are uneatable to birds.
Male imago with thinly scaled wings, without markings; flight strong and swift, sometimes in sunshine.
Butterflies are destroyed in the imagostate principally by three groups of enemies--predaceous insects, lizards, and birds.
Apart from man it is clear that only such mammals as are of arboreal habits are likely to cause destruction among butterflies in the imago state.
Imago has four scaly wings, and the mouth aglossate or antliate.
The larva from which a collector of Lepidoptera could expect to obtain such an imagowould be unicolourous, stouter in the middle, elevated in the penultimate segment, and more attenuated towards the head.
Illustration: Insects in theImago or perfect state.
THE WOLF and THE ASS are made to emblematize, “scelesti hominis imago et exitus,”—the image and end of a wicked man.
Fabricii, which emerges in the autumn, hibernates in the imago state, and lays eggs in the spring, as the winter form.
Somewhat further north this generation would be entirely suppressed, and the third brood would hibernate, either in the imago state or as pupæ or caterpillars.
From these we know that the eggs, caterpillars, and pupæ of all the seasonally dimorphic species experimented with are perfectly similar in the summer and winter generations, the imago stage only showing any difference.
Larva and Imago vary in Structure independently of each other, p.
The sacraments of the natural law were as the umbra veritatis; those of the written law as the imago vel figura veritatis; but those under grace are the corpus veritatis.
They were a mute insect, but probably the imago would make noise enough.
Here too it must be borne in mind, that by far the greater part of insects feed upon different substances in their different states of existence, eating one kind of food in the larva and another in the imago state.
The imago of the Cicada septemdecim is still eaten by the Indians in America, who pluck off the wings and boil them[569].
The imago he describes as being of a brown colour, and about the size of the common house-fly; so that it is a small species compared with the rest of the genus.
Probably, confounding the two species, he described the imago from the insect of the former, and the larva (if he did not copy from Reaumur or Linne) from that of the latter.
I have observed the imago devour these and also Diptera.
They are very active in their movements, and generally appear in the imago state about the end of summer or beginning of autumn.
Meyrick has done much to place the classification of the Lepidoptera on a sound basis, so far as the characters of the imago are concerned, but attention must also be paid to the preparatory stages if a truly natural system is to be reached.
The Eriocraniidae resemble the Micropterygidae in appearance, but the imagohas no mandibles, and the maxillae, though short and provided with conspicuous palps, have no laciniae and form a proboscis as in Lepidoptera generally.
The method of feeding of the imago by the suction of liquids has already been mentioned in connexion with the structure of the maxillae and the food-canal.
The contrast among the Lepidoptera between the suctorial mouth of the imago and the biting jaws of the caterpillar is very striking (cf.
The presence of circles of spines on the abdominal segments enables the "incomplete" pupa as a whole to work its way partly out of the cocoon when the time for the emergence of the imago draws near.
