1 90S] The Genus Coriziis 143 



This species is widely distributed in tropical America. Berg, 

 ill his Hemiptera Argentina, p. 93 (1879), reports it from the 

 Argentine Republic, Patagonia and Brazil. Uhler in various 

 articles reports it from Texas, Indian Territory, Arizona, Mexico, 

 Brazil, Maryland (once only), and Lower California. Specimens 

 are at hand from Georgia, Florida and Arizona, in the United 

 States, and from Mexico, Guatemala, Cuba, Hayti, Trinidad and 

 St. Vincent. 



Corizus parvicornis Signoret. 

 Corizus parvicornis Sign., Ann. Soc. Ent. Fr., p. 301 (1859). 



Very small. Short and thick in appearance. Neck short. 

 Length of female 3.5 to 5 mm., width 2 to 2.5 mm. Male, length 

 3 to 4 mm., width 1.5 to 2 mm. 



Head: Antenniferous tubercles short and rounded. Rostral lobes small 

 and obscure. Antennae short. First segment reaching apex of head. Head 

 narrowing very abruptly behind the eyes, thus bringing the latter very close to 

 the angles of the prothorax. 



Pronotum short. Transverse suture much curved and bordered anteriorly 

 by a prominent ridge. Scutellum large, about one-third as long as the abdomen; 

 apex broad though rather abruptly drawn to a point; the borders about the 

 large excavation prominently raised. 



Abdomen a little wider than prothorax. Genitalia: Dorsal plate in the 

 female a little produced and broadly rounded. Ventral plate widest at its 

 middle with posterior angles broadly rounded. In the male the dorsal plate is 

 much produced, and the ventral is equal in width throughout. Wings, little 

 if any longer than the body, and sometimes not reaching the extremity of the 

 abdo:nen. The whole insect has a short thick appearance which is very charac- 

 teristic. It is thinly covered with rather long hair. Punctuations large. 



Color: Varying from gray to almost black, without distinctive markings 

 except on the disk of the abdomen, which is black or brown. There is a small 

 obscure light spot about the middle of the fourth segment, and two each on the 

 anterior borders of the third and fifth. The transverse suture, and a few spots 

 on the wing veins are black. The sixth segment has the common black spot in 

 the middle and sometimes the light borders may be divided by the enlargement 

 of this spot, thus forming two light spots at the anterior margin. Connexivum 

 spotted. The sternum is black and the legs are spotted with the same color or 

 with brown. These spots usually form pretty well pronounced rings. In very 

 dark specimens the whole under side is covered over with dark or black blotches. 



This is the smallest species of the genus and seems to be rather 

 rare. Specimens are at hand from California, Texas and Mexico. 



Corizus nigristernum Signoret. 

 Corizus nigristernum Sign., Ann., Soc. Ent. Fr., p. 100 (1859). 

 Corizus Bohemani Sign., Ann. Soc. Ent. Fr., p. 86 (1859). 



Very dark in color. Spot on abdomen above, in form of an 

 X. Length of female 5.5 to 6 mm., width 3 mm. Length of 

 male 5 to 5.5 mm., width 2.5 to 3 mm. 



Head: Eyes rather prominent. Antenniferous tubercles small and close 

 to the eyes. Rostral lobes short, clearly marked. 



Pronotuni decidedly narrower in front than behind. Transverse suture 

 a slender line bordered anteriorly by a slight elevation. Median line prominent. 



