Dec, 1907.] Dyar : New York Slug-Caterpillars. 225 



base with some smooth slender hairs around seta ii without accompanying hairs. The 

 side horns are slender, over one third the length of the long subdorsal, with a 

 terminal tubercle bearing iii and a number of rather slender transparent hairs, some of 

 which, towards the tips are slightly shortspinulose. No pigmented areas. In 

 certain views, part of the side horns are visible from the dorsal aspect between the 

 long ones, but only with care. Length, 7.5 to II. 5 mm. (Chain Bridge) : 8.2 10 1 1 

 mm. (Rosslyn, No. 3) ; 9.5 to 12.5 mm. (Rosslyn, No. i) ; to 12 mm. (Tryon,N. C. ). 



Stage VI II. — Markedly different by the great increase in the number of hairs. 

 So dense as to almost completely obscure the structure. The top is even and flat, 

 many of the hairs directed straight upward, the whole resembling a fluffy disk with 

 even, broadly elliptical outline. Shape and structure essentially as before, but the 

 long horns are flexible and their tips bend backward or downward. Hairs nearly all 

 of the black-banded, white-feathered-tip type, except some long ones about the ends 

 of the long horns which are white, more slender, scarcely feathered and resemble 

 those that still persist about tubercle i. The hairs from the bulbs rise nearly erect 

 and all meet to conceal the dorsal groove. The surface is formed by the ends of the 

 hairs, consequently the bulbs themselves do not show in front or side view any 

 longer, and the outlines of the horns are obscured by the overlapping of the fringe 

 hairs. No shortened or aborted hairs, i. e., not more so than the usual feathered 

 hair is so. Green, whitish, somewhat opaque, glassy translucent ; the hairs look all 

 white, the black bands do not alter the appearance as the white feathered tips are 

 prominent, only seen with a lens. Head green, the eyes, labrum and a mark each 

 side brown. The horns on joint 12 are shorter than those on joint il, so the disk is 

 truncate behind ; horns of joints 4-5 are more proportionate but shortened. 



Later the larva became thicker, 6 mm. high, whiter and more glassy shining. 

 It is quite thick, the horns drooping to the leaf. The horns are slender, and from 

 side view the lateral horns are visible through the haze of hairs. Bulbs circular from 

 top view, higher than wide. There are furcate bases on the sides of the subdorsal 

 horns reaching to the holes that represent depressed spaces (4). These forks, both 

 in the dorsal and lateral spaces are the most glassy part of the larva. Side horns on 

 joints 6 to 12 slender, equal, sparsely haired above and toward tip (as those of joints 

 3 and 4 are all over), but below with dense white hairs that cover the spiracles. 

 Spiracle of joint 5 high up ; spiracles brown, round. Length, il to 15.5 ram. ( Rosslyn, 

 No. 3) ; 1 1. 5 to 15.5 mm. (Chain Bridge) ; 12. 5 to 17. 5 mm. (Rosslyn, No. i) ; 12 

 to 16 mm. (Tryon, N. C. ). 



On reaching maturity the larvae shed the long subdorsal horns and 

 entered the ground to spin. 



Cocoon. — Subspherical, hard, dark brown, with a round concealed lid at one 

 end, as usual. 



Pupa. — Formed in the Spring, after the hibernation of the larva. Thin-skinned, 

 pale colored, emerging from the lid of the cpcoon, as usual in the family. 



Explanation of Plate II. 



1. Larva, stage H, dorsal view. 



2. Larva, stage III. 



3. Larva, stage I V. 



