. The American entomologist. Entomology. First form of trophi and antennas in Lithocolletis guttifini- tella (after Chambers). with either claws, or the circlet of tenta- cles. These differences of structure would seem to be correlated with the differences of habit above mentioned; but if so, what shall we say as to the larvK of the third group of the same genus, comprising the majority of the species, and in allusion to the form of the larvce called the " cylindric- al " group ? These larvae are flat in their first three stages, as are those of ornatella and the flat group, in their
. The American entomologist. Entomology. First form of trophi and antennas in Lithocolletis guttifini- tella (after Chambers). with either claws, or the circlet of tenta- cles. These differences of structure would seem to be correlated with the differences of habit above mentioned; but if so, what shall we say as to the larvK of the third group of the same genus, comprising the majority of the species, and in allusion to the form of the larvce called the " cylindric- al " group ? These larvae are flat in their first three stages, as are those of ornatella and the flat group, in their first five stages. But at their third molt they undergo the same changes of form and of trophi and feet that ornatella does at its fifth First form of trophi in Phyllocnistis vitifoliella (after Chambers). and are, therefore, structurally as capable of leaving the mine and crawling away as is the larva of ornatella. Yet, they not only do not do so, but continue to feed in the mine, and pupate there. This, however, is apart from my present purpose. The fact, however, indicates that the develop- ment of the jaws and feet is independent of the habit of leaving the mine, and is also independent of their habits in the mine. I have already referred to the form of trophi, shown in Fig. 126, as different from the form shown in Figs. 124 and 125. Fig. 126 represents what I call the first form in allusion to the time of larval life when it is exhibited; Figs. 124 and 125 represent in the same way the second form, and is, as be- fore stated, the form found in ordinary cat- erpillars when they leave the eggs; and, in- deed, in all caterpillars, so far as is known, except in the earlier stages of the larvae of the genera Fhyllocnistis, Lithocolletis, Leu- canthiza, Coriscium, Gracilaria and Ornix ; and it is found in the later stages of them. [Fig. 128.]. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colo
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