TRANS. 8. D. Sociery NATURAL HISTORY 
42. Tollius setosus Van D. La Jolla and National City, June. 
43. Harmostes reflewulus Say. Common and very variable. 
44, Harmostes fraterculus Say. Mussey’s, April 1914. 3 ex- 
amples. 
45. Aufius impressicollis Stal. April to October; occasional. 
46. Corizus (Liorhysus) hyalinus Fabr. Common everywhere. 
47. Corizus (Arhyssus) validus Uhler. Found in great numbers 
on a weed, probably a Chenopodium, growing on the flats at 
Mussey’s in October. 
48. Corizus (Arhyssus) lateralis Say. What seems to be a red 
form of this species occurs in numbers on Eriogonum from 
April to July. 
49. Corizus (Arhyssus) scutatus Stal. Alpine, June, 1913, four 
examples. 
50. Corizus (Arhyssus) indentatus Hambl. Coronado and Sweet- 
water Valley, June. 
51. Corizus (Stictopleurus) crassicornis Linn.  Hurlburd’s 
Ranch, Descanso, October. 
Family LYGAEIDAE 
52. Oncopeltus fasciatus Dallas. June to October ; common on the 
narrow leaved milkweed. Young in July. 
53.  Oncopeltus sanguinolentus n. sp. 
Proportionately more siender than our other species; san- 
guineous, head in part, antenne, legs, and membrane black, the lat- 
ter with a transverse white spot. Belongs to Stal’s section “a.” 
Length 11 to 13 mm. 
Narrower and more elongated than in most species. Pro- 
notum less depressed than in varicolor, its nearest ally, sides 
straight, terete, the adjacent disk little depressed, behind the broad 
anterior margin more distinctly so; this area bounded behind by 
two crescentic impressed lines pointing forward. Median carina 
prominent across this depressed area. Posterior margin on either 
side of the scutellum compressed and foliaceous. Surface especial- 
ly of the head and pronotum distinctly hairy as in varicolor. Seu-- 
tellum strongly convex and carinate. Elytra but little widened 
toward their apex. Membrane long and narrow, surpassing the 
abdomen by not more than half its length beyond the tip of the 
corium. Antenne about as in fasciata, shorter than in varicolor; 
first joint surpassing the tylus by hardly half its length. Rostrum, 
second joint distinctly longer than the third. 
Color a uniform sanguineous marked with black as follows; 
antenne, legs, rostrum, apex of the tylus, a band on the base of 
the vertex triangularly interrupted in the middle, the cresentic 
impressed lines on the pronotum and sometimes a cloud between 
them, scutellum, or at least its base mesosternum and the mem- 
brane. The extreme tip of the abdomen is more or less fuscous 
and usually the disk of the meso and meta-pleura are blackish and 
normally there is a black spot on the middle of the costal margin of 
