144 Annals Entomological Society of America [Vol.1, 



Scutellum sharp pointed and not excavated. Lateral borders raised, except 

 at their middle points. 



Abdomen but little wider than prothorax. Genitalia: Dorsal plate in 

 female a little broader than long; apex pointed. Ventral plate widest at its 

 middle, and the posterior angles practically wanting. Dorsal plate of male some- 

 what produced and broadly rounded; ventral plate widest at the middle; pos- 

 terior angles rounded. Punctuations normal. Pubescence short and soft. 

 Wings about as long as the body. 



Color: Rather dark reddish or yellowish brown, frequently almost black. 

 Apex of head, and small spots between ocelli and eyes, black. Median line of 

 pronotum light, extending onto scutellum, the borders of which are also light 

 on the elevated portions. Disk of abdomen dark brown or black, with a light 

 spot, near its middle, in the form of an X. This spot may be much reduced, or 

 it may be enlarged to form a large irregular blotch. Last segment light, with 

 a black stripe very much enlarged laterally, enclosing two light spots at its an- 

 terior border. This enlargement is often obscure or wanting, especially in the 

 female. Connexivum, light, spotted with black. Beneath, uniform light yel- 

 low or reddish brown. Sternum black. Wing veins spotted with dark red or 

 black. Legs yellowish with dark spots. 



This Species is eastern in its distribution, and apparently 

 does not extend far south. Uhler has reported it from the east 

 and also from the south-west, Arizona, Texas, California, and 

 Lower California, but the species to which he refers here is 

 probably indentatus, which has a slight superficial resemblance 

 to nigristernum. Specimens are at hand from Canada, Ohio, 

 Pennsylvania, New York, West Virginia. Virginia, Maryland, 

 District of Columbia and Missouri. 



Signoret evidently had two extreme types of this insect 

 and hence described it twice as different species. 



Corizus punctatus Signoret. 



Corizus punctatus Sign., Ann. Soc. Ent. Fr. p. SI (1859) — Distant, Biol. Cent. 

 Am., pi. XVLfig. 8 (1881). 



Somewhat resembling nigristernum in general shape and color, 

 but with last segment of abdomen much more produced. Length 

 of female 5.5 mm., width 2.5 mm. Length of male 4.5 mm., 

 width 2 mm. 



Head: Eyes very prominent. Antenniferous tubercles short and broad, 

 rounded at the tips. Rostral lobes slender but reaching almost to the apex 

 of the head, but not clearly marked. First segment of antennae slightly passing 

 the apex. 



Pronotum much narrower in front than behind. Region of transverse su- 

 ture not tubercular. Scutellum rather sharp with a very small excavation at 

 the apex. 



Abdomen very little wider than the thorax. Sixth segment very long, 

 pointed. Both dorsal and ventral plates in the female are sharply triangular, 

 and the ventral is but little shorter than the dorsal. In the male the dorsal is 

 somewhat produced with apex rounded. Ventral plate much Avidest at its 

 middle point. Wrings about as long as the abdomen. Pubescence short 

 and soft. Punctuations norinal. 



Color, dark reddish brown or almost black above, and reddish yellow or 

 yellow, below. The eyes and ocelli are red, the latter bordered by a black spot. 

 The head has a blackish longitudinal line running throughout its length. Wing 



