Tiru 



Vol III, 



VOLl. NEW YORK, NOVEMBER, 1880, 



No. 11. 



PUBLISHED MONTHLY BY 



THE HUB PUBLISHING CO. of n. y. 



323 Pearl St., New York. 



TERMS Two dollars per annum, in advance. 



EDITED BY 

 CHARLES V. RILEY Washington, D. C. 



ON THE CHANGES THAT TAKE PLACE IN THE 

 MOUTH-PARTS AND LEGS OF SOME LEAF- 

 MINING LEPIDOPTEROUS LARVJl. 



BY V. T. CHAMBERS, COVINGTON, KY. 



In my address as President of the "Cin- 

 cinnati Society of Natural History," {vol. 

 2, p. 71 of the Journal of the Society), I have 

 given some facts as to the metamorphoses 

 of the mouth-parts of certain Tineid larvae; 

 and, at the request of the editor, I submit 

 these facts, together Avith some others, both 

 upon the mouth-parts and legs of these 

 larvse, to the readers of the American 

 Entomologist. 



If we examine the mouth-parts (or trophi, 

 as they are technically termed,) of any 

 ordinary caterpillar, whether of the macro 

 or micro-lepidoptera, we shall find that 

 they consist of an upper lip or labrum; 

 two strong jaws or mandibles; two weak 

 jaws or maxillae; and a labium; and the 

 maxillae and labium are each provided 

 with a pair of feelers or palpi; in other 

 words, it is a typical insect mouth, posses- 

 sing all of the parts of such a mouth 

 moderately developed. Differences in the 

 development of the different parts in differ- 

 ent species will be detected, but typically 

 the mouth-parts are the same. In addi- 

 tion to the parts above-named, the labium 

 will be found to be armed with a spinneret 

 which, however, with the silk glands, is 



believed to be only a special development 

 of the salivary glands and duct of other 

 larvae. Such trophi are represented in Figs. 

 124 and 125. In Fig. 124 the organs are 

 extended, and in Fig. 125 they are re- 



Larval head of Liihocolletis ornatella in seventh stage: 

 lettered parts as in Fig. 125 (after Chambers). 



Head of larv-a oi LithocoUetis guttifinitella : a, labium 

 and palpi ; i5, maxillae ; <r, mandibles ; </, antennae ; ?, labrum ; 

 y, ocelli (after Chambers). 



tracted. These figures are typical of the 

 ordinary form of Lepidopterous larval 

 trophi. 



