. Annals of the New York Academy of Sciences. Science; Science -- New York (State). A Classification of Lepidopterous Lat^vse. 197 also on the legless abdominal segments (viz., segments 1, 2, 7, 8, and 9 of the abdomen) in the corresponding position. On the last two segments (segments 9 and 10) the number of tubercles is always less than the fundamental number, even in generalized larvae. This is due to the fact that these segments have been partly aborted, being without spiracles. The reduction of segment 9 has taken place on the anterior portion, while segment 10 has lost the lateral part.^
. Annals of the New York Academy of Sciences. Science; Science -- New York (State). A Classification of Lepidopterous Lat^vse. 197 also on the legless abdominal segments (viz., segments 1, 2, 7, 8, and 9 of the abdomen) in the corresponding position. On the last two segments (segments 9 and 10) the number of tubercles is always less than the fundamental number, even in generalized larvae. This is due to the fact that these segments have been partly aborted, being without spiracles. The reduction of segment 9 has taken place on the anterior portion, while segment 10 has lost the lateral part.^ Phylogeny of the Tubercles. In comparing the larvae of other orders of insects with the Lepi- doptera, we find but few which throw any light on the origin of the present arrangement of the tubercles. The Phryganidae, the imagos of which seem to suggest an affinity with the Lepidoptera, have larvffi without any tubercles, and also without any abdominal feet. They have, however, a dorsal shield on the mesothoracic segment, as well as on the prothoracic segment, a fact which is very interest- ing in connection with the structure of the Hepialidfe and Psychidse. In the larvse of the phytophagous Hymenoptera (Tenthredinidae) we find well-developed setiferous tubercles, apparently in a more generalized condition than in any Lepidoptera. They have the fol- lowing arrangement (see Fig. 1): Above the spiracle nine tubercles Fig. 1. Fiff. 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 New York Academy of Sciences; Casey, Thos. L. (Thomas Lincoln), 1857-1925; Van Ingen, Gilbert, 1869-; Poor, Charles Lane, 1866-; Hovey, Edmund Otis, 1862-1924; Tower, Ralph W. (Ralph Winfred), 1870-1926. New York, New York Academy of Sciences
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