176 GEO. D. HULST. 



and variegated cervical shield. Principal hairs conspicuously long and slender. 

 The head is brown, with a lateral black blotch behind the eyes, smooth, much 

 darker on the slightly depressed frontal area, this bordered by depressed black 

 sutures, outside which, at a little distance, is a V-shai>ed fiue white line. An- 

 tenupe S-jointed ; first joint very large, broadly conical ; second, thick, oval, with 

 a very long stout hair at outer side of tip ; the third minute. Ocelli five, black, 

 placed behind the antennae, in a curve opening downward. Labruni broadly 

 emarginate, with rounded lobes. Maxillte and labrum pale beneath, with dark 

 sutures, strongly contrasting with adjacent parts of head. Mala and palpi brown. 

 Labial palpi minute. Maxillary palpi 3-jointed, large; first joint nearly as 

 thick as the palpiger, and about as broad as long; second joint cylindrical, width 

 two-thirds the length; third joint tapering, about two-thirds as long as the 

 second. Body with six conspicuous rows of long, pale hairs, longest on the pos- 

 terior segments, one hair of each row to each segment, each borne on a minute 

 black piliferous tubercle, scarcely as large as the spiracle. One row above spira- 

 cles, another equally distant below, and two subdorsal rows. Other smaller 

 hairs irregularly distributed. Cervical shield yellow, smooth, with a few scat- 

 tered hairs and two curved brown blotches, one on each side, separated by a 

 median spot. Anal plate coriaceous, brown, heart-shaped, with six long, stout 

 hairs at its posterior margin. Posterior segments without spines or tubercles 

 at hind margin, differing here from the peach borer. Spiracles black, nearly cir- 

 cular, anterior pair but little larger than the remaining eight, last pair not 

 exceeding the eighth in size. Thoracic legs pale reddish brown externally, 

 paler within, with dusky tips. Each proleg, except the last pair, with a complete 

 close circlet of large hooks, and several smaller ones besides, and also a horny 

 black central disk or tubercle within the ring. Last pair with a single half 

 circlet of very strong, close-set hooks. 



This is becoming a pest in Illinois, attacking and destroying Plum 

 trees. The larvpe are generally found near the forks of the trees, 

 but often at or a little beneath the ground. The smaller ones live 

 in the bark, often just below the outer skin; later they cut through 

 the whole bark often destroying trees. Kept in a breeding-cage and 

 supplied with twigs of Plum trees they, in the Autumn, spin small 

 webs, in which they i)ass the winter, pupating the next Spring and 

 emerging near the end of May. 



Other moths of this species were taken several times at the electric 

 light in 1886, 1887 and 1888, the dates of their occurrence ranging 

 from May 5th to August 24th. The greater part, however, were 

 collected in May and June, and this is doubtless the period of the 

 greatest prevalence of the winged form. The time and place of 

 oviposition are unknown. 



In brief, the species is apparently single-brooded; passes the Winter 

 as a larva in the tree; pupates in INIay; emerges in May and June, 

 and may continue to lay eggs through July and August. 



