IQOS] 



The Genus Coriziis 139 



is not a variety of hyalinus, but is closely related to crassicornis, 

 from which it differs enough, however, to give it good specific 

 rank. It seems to be confined to the west. Specimens are at 

 hand from Colorado, Utah, California, Wyoming, Nebraska, 

 and Assiniboine, B. A. 



Corizus scutatus Stal. 

 Rhopalus scutatus Stal., Frcg. Eug. resa. Inst., p. 239 (1859). 

 Corizus jactatus Signoret, Ann. Soc. Ent. Fr. p. 81 (1859). 



Female, length 8 to 9 mm., width 3 to 4 mm. Male, 7.5 to 

 8 mm., width 3 to 3.5 mm. 



Head: Antenniferous tubercles broad but not long. Rostral lobes clearly 

 marked, narrow and not reaching the apex of the head. The whole upper sur- 

 face of the head is rough and tubercular. First segment of antennae just reaches 

 the apex of head. 



Pronotum: Transverse suture on a tubercular ridge which reaches quite 

 to the borders of pronotum. Scutellum broad and rounded at the apex which is 

 excavated. 



Abdomen prominently widened at third and fourth segments, especially in 

 the female. Genitalia: Dorsal plate in the female broadly triangular and gent- 

 ly rounded at the apex. Ventral plate widest at its middle and extending back- 

 ward almost as far as does the dorsal plate. In the male the middle part of ven- 

 tral plate is very narrow and the posterior angles rounded. Wings about as long 

 as the abdomen. Punctuations not prominent. The whole insect is covered 

 with a rather thick growth of short hair. 



Color: Dull reddish brown above and tinged with yellow below. The 

 median line on pronotum is usually lighter in shade and extends to the depres- 

 sion on the scutellum. In very dark specimens the apex of head and first three 

 segments of antennae are nearly black, and a black line is found between the eye 

 and ocellus. The scutellum may also be very dark except median line and 

 borders. In very light specimens the color is uniform throughout the whole 

 upper surface. Disk of abdomen black, with visually two small yellow spots on 

 anterior borders of second, fifth and sixth segments, and another in the middle 

 of the fourth. The sixth has two yellow stripes, one on either border, which 

 sometimes fuse with the spots. The connexivum is light with a large brownish 

 or reddish spot on each segment. This color sometimes approaches that of the 

 connexivum and they are then almost invisible. Sometimes there is a line on 

 each side of the abdomen below, dark reddish brown. Legs with a few small 

 black points. 



This species is not widely distributed, being, so far as known, 

 confined to the western United States. Specimens are at hand 

 from Oregon, Utah, Wyoming and California. 



Corizus indentatus n. sp. 



Somewhat resembling scutatus but smaller and more hairy. 

 Length of female, 4.5 to 6 mm., width 2 to 3 mm. Male, length 

 4.5 to 5 mm., width 2 to 2.5 mm. 



Head: Antenniferous tubercles small but rather sharp, very close to the eyes. 

 Rostral lobes short and obscure. First segment of antennae reaches a little 

 beyond the apex of the head. Upper surface rough and tubercular. 



Pronotum tubercular, especially in the region of the transverse suture which 

 is often difficult to trace on this account. This suture forms a rather deep 

 depression on either side of the median line. Scutellum rather broad and round- 

 ed at apex, with borders slightly raised near the end which is not excavated. 



