274 THE CANADIAN ENTOMOLOGIST. 



Legs in great part pale ; pygidium, sides of the abdomen, and frequently 

 the elytra with cretaceous spots. 

 Prothorax nearly as strongly punctured at middle as at sides ; less 

 strongly narrowed from base ; elytra green, with testaceous 



margin Iwibnlis. 



Prothorax much more sparsely and finely punctate at middle than at 

 sides; more strongly narrowed from base; elytra uniform in color- 

 ation, varying from green to brownish yellow fiilgida. 



Legs concolorous with the lower surface ; cretaceous spots lacking ; 



scutellum less elongate Jiolochloris. 



Prionns he?os, n. sp. — Nearly black, the under surface and legs tend- 

 ing to castaneous in the female. Form very robust, prothorax nearly as 

 wide as in laticoUis, but distinctly more coarsely and densely punctate 

 than in that species, sex for sex ; lateral teeth more acute than in 

 laticollis, but less so than in Califoriiicus. Elytra moderately shining, the 

 raised lines sharply defined in the male, feeble in the female, punctuation 

 nearly as in Californinis in the female, coarser in the male, but not at all 

 rugose. Antennje 1 2-jointed, of the usual form. Prosternal process 

 strongly ascending at tip wiien viewed laterally, more inflated apically ' 

 and subhorizontat in laticollis. Metasternum moderately hairy in the 

 male, nearly glabrous in the female. Soles of hind tarsi densely spongy 

 pubescent, with a distinct median channel which is wider on the basal 

 joint, and evidently wider on all the joints than in laticollis. In the 

 female the median channel is still wider, and is well marked in the middle 

 tarsi, scarcely so in laticollis. 



Length, 40 ( (^ ) ; 48 mm. ( V ). 



Described from a single pair taken in Southern (?) Arizona. 



Heros should stand between laticollis and Califor/iicus, differing from 

 the former in its larger size, more coarsely punctate prothorax, with more 

 acute lateral teeth, smoother elytra, strongly ascending prosternal process, 

 and less completely pilose tarsal soles. From Californicus it differs in its 

 more robust form, wider prothorax and glabrous metasternum in the 

 female. There do not seem to be any Mexican species with which the 

 present one can be confused, both Flohri and Mexicaiius, the only species . 

 accredited to that region in the " Biologia," differing in the number of 

 antennal joints, thirteen in the former and fourteen in the latter. 



