iQoS] The Genus Coriziis 141 



This is a light colored species, red and yellow predominating. 

 Eyes prominent and apex of head sharp pointed. Length of 

 female, 5.5 to 6 mm., width 2.5 to 3 mm. Male, length 5 to 5.5 

 mm., width 2 to 2.5 mm. 



Head: Antenniferous tubercles very .small and close to the eyes. Rostral 

 lobes prominent though not reaching the apex. First segment of antennae just 

 reaching the apex of the head. Eyes prominent. 



Pronotum much narrower in front than behind. Transverse suture reach- 

 ing to the borders of the pronotum. Scutellum narrowing rather abruptly near 

 the base; slender near the apex which is rather sharp and somewhat elevated. 

 Borders of apical portion raised. 



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

 female broadly triangular with rounded apex. Ventral plate with posterior 

 angles evenly rounded. Dorsal plate in male produced and spatulate. Ventral 

 plate wider at the edges and middle, almost as long as dorsal plate. Wings as 

 long as or a little longer than the abdomen. Pubescence medium. Punctua- 

 tions coarse but not tubercular. 



Color: This species is so variable in color that little use can be made of 

 this character for the purpose of identification. Red and yellow predominate, 

 and black is usually wanting except on disk of abdomen and wing spots, and even 

 from here it sometimes disappears. The red varies from bright to pale. In some 

 cases the head and thorax are red and the under side of abdomen a bright yel- 

 low. Occasionally lateral reddish brown stripes are found on the under side of 

 the abdomen, especially in the males. The color scheme on the disk of abdomen 

 consists of a large transverse spot at the base, two lateral longitudinal areas about 

 the middle, the spot on anal segment and three small spots on the enclosed area, 

 black or reddish. These areas may increase in size until they cover the entire 

 abdomen except the anal segment, or they may entirely disappear. Connexi- 

 vum, except in very rare cases, without spots. Sternum black, reddish or 

 colorless. 



This is a widely distributed species in the U. S. and seems to 

 be more abmidant in the south. Specimens are at hand from 

 practically every part of the United States. 



Corizus validus Uhler. 

 Corizus validus Uhler, Proc. Ent. Soc. Wash. p. 370 (1893). 



Closely resembling lateralis in form and color. Very large. 

 Rare. Length of female, 7 to 8 mm., width 3.5 to 4 mm. Male, 

 length 7 to 7.5 mm., width 3 to 4 mm. 



This insect diflers so little from lateralis that it is doubtful if 

 it should be retained as a separate species. The head and thorax 

 characters are practically identical. The scutellum is a little 

 broader in the last third of its length, and the apex is a little more 

 sharply pointed. 



There is little difference in the genitalia, and what is notice- 

 able might disappear if sufficient material were at hand. In the 

 female the posterior angles seem to be rather more rounded than 

 in lateralis, and in the male the widening of the middle portion of 

 the ventral plate seems to be a little more pronounced, thus giving 

 it a longer and sharper point when viewed from the side. In the 



