THE AMERICAN ENTOMOLOGIST. 



23 



Coloi'S— I'ea-grecMi, lilac, and yellow. 



grape-feediiigf species by having tlie third and 

 fourth rings immensely swollen, while the first 

 and second rings are quite small and retractile. 

 It is from this peculiar appearance of the fore 

 ])artof the body, which strikingly suggests the ftit 

 checks and shoulders and small head ot a blooded 

 hog, that it may best be known as the Hog cat- 

 erpillar of the vine. The color ot this worm 

 when fnll grown is pea-green, and it is wrink- 

 led transversely and covered with numerous 

 pale-yellow dots, placed in irregular transverse 

 rows. An oblique cream-colored lateral band, 

 bordered below with a darker green and most 

 distinct on the middle segments, connects with 

 a cream-colored subdorsal line, which is bor- 

 dered above with darker green, and which ex- 

 tends from the head to thehornatthe tail. There 

 are five and olten six somewhat pale yellow tri- 

 angular patches along the back, each contain- 

 ing a lozenge-shaped lilac-colored spot. The 

 head is small, with yellow granulations, and 

 four perpendicular yellow lines, and the stig- 

 mata or spiracles are orange-brown. When 

 about to transform, the color of this worm usu- 

 ally changes to a pinkish-brown, the darker 

 parts being of a beautiful mixture of crimson 

 and brown. Previous to this change of color 

 Mr. J. A. Lintncr, of Schoharie, N. Y., has ob- 

 served the worm to pass its mouth over the 

 entire surface of its body, even to the tip of its 

 horn, covering it with a coating of apparently 

 glutinous matter— the operation lasting about 

 two hours.* Before transforming into the pupa 

 or chrysalis state, it descends from the vine, and 

 within some fallen leaf or under any other rub- 

 bish that may be lying on the ground, forms a 

 mesh of strong brown silk, within which it soon 

 changes to a chrysalis (Fig. 13) of a pale, warm 

 • Proc. Eut. Soc. Phil., Ht, pp. Ofi.3. 



Colors — Yellowibli and brown 



yellow, speckled and spotted with brown, but 

 characterized chiefly by the conspicuous dark 

 brown spiracles and broad brown incisures of 

 the three larger abdominal segments. 



The moth (Fig. 14) which in time bursts from 

 this chrysalis, has the body and front wings of a 

 fleshy-gray, marked and shaded with olive- 



[Fig. U.] 



Colors — Gray, oUvc-groen and rnst color. 



green as in tlie figure, while the hind wings are 

 of a deep rust-color, with a small shade of gray 

 near their inner angle. 



This insect is in northerly regions one-brooded, 

 but towards the south two-brooded, the first 

 worms appearing, in the latitude of St. Louis, 

 during June and July, and giving out the moths 

 about two weeks after they become chry.'alids, 

 or from the middle of July to the first of August. 

 The second brood of worms are full grown in 

 September and,passing the winter in the chrys- 

 alis state, give out the moths the following May. 

 On one occasion we found at South Pass, 111., a 

 worm but i grown and still feeding as late 

 as October 20th, a circumstance which would 

 lead to the belief that at points where the win- 

 ters are mild they may even hybernatc in the 

 larva state. 



This worm is a most voracious feeder, and a 

 single one will sometimes strip a small vine of 

 its leaves in a few nights. According to Harris 

 it does not even contine its attacks to the leaves, 

 but in its progress from leaf to leaf, stops at 

 every cluster of fruit, and cither from stupidity 

 or disappointment, nips otf the stalks of the 

 half-grown grapes and allows them to fall to the 

 ground untasted. It is fortunate for the grape- 

 grower therefore that Nature has furnished the 

 ready means to prevent its ever becoming ex- 



