A Classification of LejndojJterous Larvae. 211 



Sesia tipuliformis Linujeus. 



The tubercles are small and the sette fine, arising from slight 

 corneous elevations. There is an elevation just behind the spiracle, 

 and TWO others on the substigmatal folds, without set^e, while tuber- 

 cle iv is very minute, though situated on the same elevation with v. 

 The general arrangement is somewhat deceptive at first sight, espe-^ 

 ciallv owino- to the minuteness of some of the tubercles. 



Melittia ceto Westwood. 



The tubercles are very small and obscure. In fact most of them 

 seem to have disappeared. I was able to locate the position of i 

 and ii, and there are traces of the corneous areas which the others 

 occupied; but they are all very degenerate. The larva is plump 

 and smooth, without any distinct annulets on the segments. 



Family Pterophoridae.^ 



We now come to a new line of modification, where the tubercles 

 have become converted into many haired warts. I could not obtain 

 any larvfe of this family, and my old notes are not sufficiently full, 

 though they indicate the conclusions expressed in my synopsis. A 

 careful study of this family would be full of interest, and I hope to- 

 be able to make it. 



Family Pyromorphidae.^ 



I take the following from my notes. It shows essentially the 

 same structure as in the two following families, though we have 

 no poisonous spines and the feet are normal. 



1 Mrs. Knopf has examined and sent me sketches of the tubercles of the 

 larvae of three European species, with the kind assistance of Mr. G. A. Poujade, 

 of the Natural History Museum of Paris. In all the species there are single 

 setje only, without any development of warts, and in two they are all very 

 degenerate. In the third, Leioptilus scarodactylus Hiibn., the setse are all quite 

 well developed, and tubercle i is wanting, as in the American form with warts, 

 referred to above. 



2 The European family Anthroceridse, Kirby :=( Zygaenidffi of authors), 

 should come just before the Pyromorphidse. I have examined the larva of 

 Anthrocera Jilipenduhe. The tubercles are converted into warts, but the warts 

 are greatly reduced, being represented by tufts of short hairs. Tubercle i is 

 absent, iv and v are consolidated, and vii is very distinct on the base of the 

 leg. Here we have direct evidence of the continuity of this series of families- 

 with the ancestors of the Pterophoridae and allies. 



