March, is 9 8.] Dyar : Life-Histories of N. Y. Slug Caterpillars. 3 



This species has a northern range. I obtained it at Jefferson High- 

 lands, N. H., in the White Mountains, where only a few species of 

 Eucleidse are found. Its southern limit is not known, though it occurs 

 throughout New York. It is one of our rarer species, yet locally fairly 

 common. 



There are six or seven stages. The former number is here described. 

 When seven stages occur, the extra one is interpolated after stage V. 

 It resembles stage V closely, the white depressed spaces being a little 

 more distinct, setse large. The larva under observation fell behind in 

 length from the measurements given more and more in each stage, but 

 attained the same final size, owing to the extra stage. The young larva 

 possesses distinct urticating power, in spite of the absence of stinging 

 spines. The sharp setae, though not converted into true spines, proba- 

 bly function similarly. 



Criticism of Previous Descriptions. 



I have given the characters of the mature larva several times. I sup- 

 pose Dr. Packard's brief description of an unidentified form to have 

 been taken from this species, although the description is scarcely deter- 

 minate. It could hardly be anything else, however. 



In the present descriptions I have gone a little beyond my brief in 

 including in the synomymy the dark forms albipunctata, goodellii and 

 ocellata. Nothing but the pale form ge?ninata was bred from these larva?, 

 so that there is a possibility of another species. 



Description of the Several Stages in Detail. 



Egg. — Rather narrowly elliptical, flat as usual, translucent white on 

 glass, shining like a wet spot on the back of the leaf ; I.3X.7X- 1 mm - 

 Reticulations rather distict all over the egg, but much rounded, like cir- 

 cular shallow pits, varying a little in size. They hatch in 14 days. 



Stage I. — Rounded, thick, tail rounded ; spaces all of moderate 

 width, the subventral one small. Color translucent whitish. Spines 

 transparent, short, clubbed-tipped, the subdorsal ones on joints 5, 7 and 

 9, leaning out slightly and the lateral one of joint 5 leaning up. Joint 

 2 not much retracted, a large cervical shield with several fine seta?. The 

 subdorsal spines on joints 4-12 have just a trace of the side branch, seen 

 in certain lights as a small irregularity. Skin smooth ; slight segmental 

 hollows are present dorsally at the upper sides of the bases of the tuber- 

 cles. Arrangement of the setse (Plate I, fig. 2), as in Apoda y-invcrsa 

 except that there is only one middle seta on joint 4. The outer third 



