Dec. 1896.] Dyar: Life-Histories of N. Y. Slug Caterpillars. 183 
with a central pale line and pale tip ; setae pale, simple as before, but 
supplemented by many very fine short curved hairs, also simple. The 
primitive setae may be distinguished, arranged as in the mature larva, i 
on the basal portion, ii on the apex of the subdorsal horns. Length 5 
to 7 mm. 
Stage VI .—Long horns longer, short ones shorter in proportion 
than before, the second, third and fifth pairs (joints 5, 6 and 8) curved 
backward, sickle-shaped the seventh pair (joint 10) forward. Nine pairs 
visible from above, first and eighth short, fourth and sixth very short. 
Each has a distinct constricted basal piece, the terminal setae of both 
portions arising from a round tubercle. Horns covered with large stiff, 
smooth, pale setae and also with fine, short, broadly branched hairs 
which become very dense at the apices of the long horns, giving the ap¬ 
pearance of rusty brown tips. On the short horns these fine setae are 
few or absent. A few dark hairs on the dorsum as before. Lateral 
horns and the lower ones of thorax short, conic, with many pale spines 
and a pale bare tip. Color brown, the horns darker with a white stripe 
up the middle. Subventral area broadly white. As the larva grows 
the bases of the subdorsal horns swell up on the lower side. Length 
6.5 to 8.5 mm. 
Stage VII .—Shape and proportions of the appendages much as in 
the mature larva, but slenderer and the posterior ones less closely applied 
to each other. The first, second, third and fifth pairs curve backward, 
the seventh and eighth forward, the tenth pair is just visible from above. 
Clothing of the horns more modified than before. The fine brown 
branching secondary hairs are thick, especially along the anterior edges 
of the long horns ; the coarse pale hairs are still present about as be¬ 
fore on the basal pieces and short horns, but on the long horns outwardly 
reduced in number and partly converted into long pale setae irregularly 
spinulated toward the tip on one side. Lateral tubercles with a bare 
tip, from which arises the primitive seta, surrounded by a circle of stiff 
hairs. Color brown, the horns darker, a pale gray line up the middle 
of each, furcate on the basal pieces ; subventral edge white. The long 
white hairs are on the posterior edge of the horns, away from the greatest 
number of fine brown hairs. Length 8 to 10 mm. 
Stage VIII. —All pale whitish brown with scarcely any marks. 
Hair clothing almost exactly as before, except for the addition of a few 
black, club-shaped spinulated hairs (Plate VIII, fig. 12) on the long 
horns. Seta ii of subdorsal row on the long horns arises from a bare 
cone surrounded by a brush of little black spines. Lateral row well 
