166 AMERICAN COLEOPTERA. 



Legs entirely black, rufous spot large, apical. (Southern 



Arizona.) simulans Schf. 



Elytra entirely black. 

 Elytral pubescence uniform in color and distribution, surface with- 

 out trace of aeneous lustre. 

 Pygidium unicolorous. 

 Eyes flatter than usual, spur of hind tibia short, about half as 

 long as the width of the first tarsal joint, pubescence sparser, 



legs variable in color. (Middle States) nigriims Horn. 



Eyes normally convex and prominent, spur of hind tibia a little 

 longer than the width of the first tarsal joint, pubescence 

 denser, four anterior legs pale rufous, hind legs black. 



(Arizona, Southern California.) pruininus Horn. 



Pygidium with two or three basal white spots. (Southern Ari- 

 zona,) pygidialis Schf. 



Elytral pubescence variegated. 



Surface without aeneous lustre, eyes normally prominent, front not 

 carinate. (Brownsville, Texas, to Lower California.) 



sordidus Horn. 

 Surface lustre aeneous, eyes flatter, front carinate. (Texas.) 



subaeneus Schf. 

 B. ulkei Horn. 



This species of the same form as amicus of the following 

 group, with which it agrees in the peculiar glabrous impunc- 

 tate area of the vertex ; the eyes, however, are normally con- 

 vex. It looks much out of place in the present group, and 

 is tabulated here merely because of the dentation of the hind 

 thighs. 

 B. nig-riims Horn. 



Except for the absence of the red elytral spot, this could 

 not possibly be separated from cruentatus, and I believe it to 

 be only an immaculate variety as already hinted by Mr. 

 Schaeffer. The legs are quite variable in color, being either 

 entirely black with the front and middle tibiae rufescent, or 

 with the four anterior legs pale and the hind femora and 

 tibiae bicolored. 



B. auctus n. sp. 



Very close to and perhaps only a variety or race of bivulneratus, from 

 which it differs in the generally smaller size and bright rufo-testaceous 

 legs and antennas, the latter sometimes with the intermediate joints 

 somewhat infuscate. The pubescence of the pronotum is distinctly bi- 

 colored, being ochreo-fuscous at the middle of the disk, changing to 



