1908] The Genus Coriziis 137 



Dakota, Iowa, Ohio, Bermuda and Hayti. It is reported by 

 Uhlcr from Lower California, New Mexico, and Grenada, W. I. 

 Oshanin in 1906 reports it from southern Russia, Caucasia, Turk- 

 estan, Japan and ChiH. (For further references and synonomy, 

 see Lethierry and Severin's General Catalogue.) 



Corizus crassicornis Linneus. 

 Cimex crassicornis Linneus, Syst. Nat., 10th Ed., I, p. 448; 12th Ed., I, p. 727; 



Faun. Suec, p. 254. 

 Rhopalus punctiventris Dallas, List. II, p. 526 (1852). 

 Corizus novaeborecensis Sign., Ann. Soc. Ent. Fr., p. 97 (1859). 

 Corizus borealis Uhler, Proceed. Acad. Phila., p. 284 (18G2). 



A large species easily recognized by its broad vertex and 

 spotted connexivum. Length of female, 7.5 to 8.5 mm., width 

 3 to 3.5 mm. Male, length 6 to 7 mm., width 2.5 to 3 mm. 



Head: Vertex broad, due to the thickened rostral lobes which extend 

 almost to the apex. Antenniferous tubercles prominent, angular, and extending 

 well forward. First segment of antennae passing beyond the apex of the head. 

 Eyes not so prominent as in hyalinus because of the more prominent antenni- 

 ferous tubercles. 



Pronotum rather sharply angled anteriorly. Transverse sutui-e terminating 

 at either side in a closed loop. Scutellum gently narrowing from base to near 

 the apex, where it expands slightly, and is rounded and excavated; borders 

 slightly raised. 



Abdomen rather abruptly widened at the third and fourth segments, espec- 

 ially in the female. Genitalia: Dorsal plate in female broadly triangular and 

 rounded at the apex. Ventral plate compressed laterally, posterior angles 

 i^ounded. Wings little, if any, longer than the abdomen. Punctuations small 

 and pubescence very short. 



Color: Above brownish gray, sometimes nearly black. Broad stripe on 

 first segment of antennae, spots between ocelli and compound eyes, transverse 

 suture on pronotum, black. The scutellum is usually much darker at its base 

 and has the small depression at its apex black. Wing nerves light with few 

 spots. 



Abdomen black with three light spots, one occupying the middle of the 

 third, fourth and hfth segments and two on the fifth, whose posterior border is 

 also light. These spots may vary in size and may be fused, forming an inverted 

 V-shaped spot. The sixth has two large j^ellow spots, one on either side, that 

 reach the extreniit}'. Connexivum light with a dark spot on each segment. 

 Under side and legs yellowish gray, the latter spotted over with black. Large 

 irregular black blotches on inner side of posterior femurs. 



The color of this species, as of others, varies greatly. The 

 ocelli may be entirely surrounded by a black spot which reaches 

 the thorax. The transverse suture may be brown or gray, like 

 the rest of pronotum. The black spots on wing nerves, depres- 

 sion at apex of scutellum, and spots on connexivum may be 

 light or reddish brown. In very dark individuals the head, pro- 

 notum and scutellum may be heavily spotted with irregular 

 blotches of black, and the black spots on connexivum may extend 

 to the underside, and there may be a few small black spots, one 

 on the posterior border on each side of the first, second and third 



