March, 1898] Dyar : Life-Histories of N. Y. Slug Caterpillars. 5 



skin. Lateral large areas (4) and (6), indicated by pigment under the 

 granules, the smaller ones not represented. Tubercles obsolete, setae 

 minute. The body is elongate, rather narrow, highest through joints 

 7-8. Color, whitish green, becoming whiter during the stage as the pig- 

 ment is slowly deposited. A dorsal green line interrupted by the dorsal 

 impressed spots, subdorsal lines straight, yellowish white, connected on 

 joint 3 and on the tail, edged above with dark green. A row of white 

 dashes on the lateral ridge, the large depressed spaces (4) becoming 

 whitish with dark centers like (1). Length, 7-1 1.5 mm. 



Cocoon and pupa as usual. 



Food-planls. — Wild cherry, white birch, black birch, oak, bayberry, 

 sour gum, hickory and Clethra alnifolia have been observed. 



Packardia elegans Packard. 



1864 — Cyrtosia elegans Packard, Proc. Ent. Soc. Phil. Ill, 342. 



1864 — Cyrtosia £usca Packard, Proc. Ent. Soc. Phil. Ill, 343. 



1881 — Fackardia nigripunctata GoODELL, Can. Ent. XIII, 30. 



1891 — Packardia elegans Dyar, Trans. Am. Ent. Soc. XVIII, 157. 



1894 — Packardia elegans Neumoegen & Dyar, Journ. N. Y. Ent. Soc. II, 76. 



Larva. 

 1864 — Packard, Proc. Ent. Soc. Phil. Ill, 343 (cocoon; no larva). 

 1881 — Goodell, Can. Ent. XIII, 31 (brief desc). 

 1890 — Packard, 5, Kept. U. S. Ent. Comm. 149 (quotes Goodell). 

 1891— Dyar, Can. Ent. XXIII, 277. 

 1893 — Packard, Proc. Am. Phil. Soc. XXXI, 100. 

 1894 — Dyar, Ann. N. Y. Acad. Sci. VIII, 222. 



Special Structural Characters. 

 Elongate elliptical, rounded before, joint 13 produced into a pointed 

 tail. Dorsal space rather narrow, diminishing a little at the ends, 

 slightly arched, highest at joints 6-7 ; lateral space broad, concave ; 

 subventral space broad, narrowly retracted in the middle. Ridges 

 moderate, the lateral the most distinct, subtubercular, setiferous; smooth 

 in the last stage. Skin rather coarsely clear granular, always without 

 secondary spines. Depressed spaces feebly developed, (1) and (4) 

 show faintly as pale rings, seen by transparency as if at the bottom of 

 pits with convergent sides. Pigment unusually scanty ; a band of green 

 color extends along the upper half of lateral area below the subdorsal 

 ridge, elsewhere the body is transparent, faintly colored greenish by the 

 blood. Dorsal vessel plainly seen and the contents of alimentary canal, 

 showing through the dorsal space. At the end of the last stage the 



