. The American entomologist. Entomology. THE AMERICAN ENTOMOLOGIST. 257 developed articulated feet on the thoracic segments, and its pro-legs are armed with the circle of hooklets, as in ordi- nary caterpillars. In the flat group of larvge, however, the jaws are not only greatly aborted and functionless in the last two stages of larval life, but the tho- racic feet, as well as the ventral ones, are membraneous, and neither set is armed [Fig. First form of trophi and antennas in Lithocolletis guttifini- tella (after Chambers). with either claws, or the circlet of tenta- cles. These diffe
. The American entomologist. Entomology. THE AMERICAN ENTOMOLOGIST. 257 developed articulated feet on the thoracic segments, and its pro-legs are armed with the circle of hooklets, as in ordi- nary caterpillars. In the flat group of larvge, however, the jaws are not only greatly aborted and functionless in the last two stages of larval life, but the tho- racic feet, as well as the ventral ones, are membraneous, and neither set is armed [Fig. 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 Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Metcalf Collection (North Carolina State University). NCRS. New York : Max Jaegerhuber
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectentomology, bookyear1
