March 1897.] 



Dyar: Life-Histories of N. Y. Slug Caterpillars. 



Ill * IV, VI and VII, which illustrates the life history very well, 

 though it' is not a complete account of it, as it purports to be. The de- 

 scription and figure of stage I are in error in placing a lateral horn on 

 joint 5 In stage -IV" (=VI) the paired glandular dots (i) are 

 again called - warts," and in the last stage he says " these dots appear 

 to be modified surface dorsal pdiferous warts ..." I do not think 

 they are The appearance is glandular and I have seen in T. fascwla 

 a small drop of moisture in the location of each one of these depressed 

 spaces which I believe was the secretion, not at the time evaporated. 

 Besides, all the normal primary warts are situated elsewhere, and there 

 are no warts, primary or secondary, in the whole order Lepidoptera in 

 such a position (in the incisures). That they are not secondary warts 

 is indicated by the fact that they are not more distinct in the early 

 stages and never bear any set«, as would be expected if they were 



degenerate warts. 



Dr Packard regards Adoneta as one of the more generalized forms 

 of its group, and with this I agree, though I think it is not so generalized 

 as Enclea indetermina. He says: " This larva indicates in some points 

 of its structure its descent, and that of the group to which it belongs, from 

 the Attacin^ ; these points are the setiferous tubercles and the distinct- 

 ness of the segments from one another, the sutures being well marked. 



Recently Dr. Chapman also falls in with this view. He says 

 (Trans. Ent. Soc. London, 1896, p. 584): " My observations on the 

 spines of Limacodes and Backs, and again of these and Sphinges and 

 Saturnids . and the observations of Poulton and Weissman, on the 



larv^ of A^lia, Sphingids, etc., leave no room for doubt that all these 

 families ar^ related . . . . " The question of the relation between the 

 Sphingides and Saturniides, which Poulton, Weissman and Muller dis- 

 cuss, is aside from the present matter, and cannot be answered vvith the 

 same certainty till some more generalized Sphingid^ are found. But 

 the relationship which is claimed between the Eucleid^ and Saturniides 

 on account of the spines, seems to me of exactly the same nature as that 

 between the species of Apatela and the several families in which Mr. But- 

 ler once distributed them, based with equal probability on the similar 



structure of the hairs-t 



*l^r"BHdgh^l7^1^^^^^as stating that this stage was drawn "after the first 



molt ■' However, I imagine that the true first molt escaped his observation, as I do 

 not suppose he was looking for a molt before the larva had eaten anythu^g. 



+ The stinging spines of the Saturnians (HemUeuca, etc.) are not ancestr.al to 

 the whole gro^p. nor are they so in the Eucleid... which I expect to illustrate m a 

 genealogical tree to be given at the end of these articles. 



