Dec, 1907. J Dyar : New York Slug-Caterpillars. 223 



Description of the Several Stages in Detail. 



AiT- — Elliptical, flat; shell white, evidently colorless and transparent, shining 

 like a drop of water as usual; reticulations faint, angular. Size, 1.4 X^'^ mm. 

 (Chain Bridge, Va. ) ; l.i X l.o mm. (Tryon, N. C. ). 



Stage I. — Elliptical, somewhat flattened dorsally, the anterior end thickened, 

 tail slightly tapering ; all smooth shining translucent whitish, the food giving a green 

 tint. Head small, white, concealed in joint 2. Spines long, tapered, single, with a 

 false central joint, three rows on the thorax, two on the abdomen (except joint 5), 

 as in Fhobetron pithecium ; colorless, whitish. The alternate ones on joints 7, 9 

 and 1 1 of the subdorsal row lean outward. Lateral row equally long and alike, uni- 

 form. The subdorsal ridge is a little more opaquely whitish than the rest. Length, 

 I to 1.6 mm. 



Stage II. — Elliptical, thick, flattened; subdorsal horns thickly conical, short, 

 placed around the subdorsal margin, of about equal length except three pairs, which 

 are very short and the posterior pair, which is intermediate. There are three long 

 horns before, then three short ones, alternating with two long ones, and last the inter- 

 mediate posterior pair. Bases of horns roundedly thickened, leaving a narrow dor- 

 sal groove. All sparsely covered with short, pale hairs. Lateral horns minute, con- 

 cealed. Translucent whitish green, like glass. Head whitish, within the hood of 

 joint 2. Length, 1.4 to 2.4mm. 



Stage III. — Elliptical, flattened ; dorsal space narrow, groove-like between the 

 bases of the horns; lateral and subventral spaces also small, mostly occupied by the 

 large bases of the subdorsal horns; these are situated on joints 4 to 12, long, blunt 

 and rather thick, a little tapering and projecting laterally, parallel to the leaf and not 

 far above it, of equal length except the fourth, sixth and eighth pairs which are about 

 two thirds the length of the others. Horns of joint 3, the lateral ones the whole 

 length and the subdorsal of 13 short, shaped like the subdorsal ones but about one 

 eighth their length and obscured from dorsal view. The subdorsals have at the base 

 above a round, button-like prominence, distinctly constricted off" from the horn and 

 as high as wide. Hairs moderately numerous, on all the horns, short, stift", color- 

 less, with tubercular bases. Color green, mostly in the tips of the horns. The skin 

 is thick and transparent, the pigment forming a small green core in the horns. Skin 

 with sparse flne clear granules. There are only smooth sette on the horns except the 

 terminal primary ones (ii) which are more slender and have a truncate conical base. 

 The subdorsal horns have a small cordate base dorsad of the rounded knob. Skin 

 glassy, shining. Length 2.4 to 3.7 mm. (Tryon, N. C. ) ; to 2.9 mm. (Rosslyn, Va., 

 No. i) ; to 3.2 mm. (Rosslyn, Va., No. 2) ; to 3.8 mm. (Chain Bridge, Va. ). 



Stage IV. — Subdorsal horns all long and equal (Rosslyn, Va., No. 3) or those 

 of joints 7, 9 and II still shorter than the others, about three fourths their length 

 (Rosslyn, Va., No. l); otherwise the same in shape and color. There are three 

 horns on joint 3, the upper one quite long, but subordinate to the others of the sub- 

 dorsal row and without the basal button, the middle one small, the lower very 

 small. Three horns on joint 4, the upper a functional horn, the others in a pair 

 below it. Subdorsals of joints 5-12 equal to the subdorsal of 4 and very nearly uni- 

 form ; subdorsal of 13 quite small, subordinated. Laterals of joints 6 to 12 small, 

 but all haired like the subdorsals. Basal buttons hemispherical with the same clear 

 spiny hairs. Skin finely setose-granular. Color green from the horn-cores as before. 



