312 ACADEMY OF NATURAL SCIENCES 



a longitudinally oval rufous spot on the lateral margin, and a 

 transverse impressed line and spot at base : seutel rounded at tip: 

 elytra densely punctured, tip mucronate, and with an indented 

 spot : 00X33 and trochanters rufous : pectus rufous, a lateral, sub- 

 marginal black spot. 



Length about seven-twentieths of an inch. [248} 



Taken on the lower Missouri, near Fort Osage : closely allied 

 to the preceding species. 



[Afterwards described as Ptjrochroa infumata Hentz, and Pcd. 

 tnarginirolUs Ziegler. — Leg.] 



9. A. I.MPRESSUS. — Black : thorax rufous ; an indented spot 

 at the tip of each elytra. 



Inhabits Pennsylvania. 



Mouth, antennae, two basal joints, and palpi at base, dark rufous : 

 thorax rufous, with a longitudinal slightly impressed line : elytra 

 densely and irregularly punctured ; a large profound, indented, 

 oval iinpunctured spot at the sutural tip of each elytra. 



Length three-tenths of an inch. 



Resembles A. coUaris, but is distinguished by its somewhat 

 larger size, and the profoundly impressed spot at the tip of each 

 elytra. I found this species early in May, attached to the side 

 of a Mcloe angusfkoUis, which was perfectly at rest upon the 

 ground, not appearing to be in the slightest degree incommoded 

 by the weight of its temporary parasite, but seeming rather 

 pleased with its society. This species and the Iwjuhris, collaris, 

 t''rniinafi)>, and lahiatun, differ much from the other species of the 

 genus that have come under my observation ; but as they appear 

 to me to approach more closely to this genus than to any other, 

 I place them here for the present. 



ANTIIRIBUS Fabr. 

 L A. .NOTATUS. — Black; head, thorax each side before, and 

 elytra at base and tip, with a gray spot. 

 Anthribus notatus Melsh. Catal. 



Head entirely gray above : autennre piceous-black : [249] tho- 

 rax with an irregular gray spot each side before, connected by a 

 line of the same color, on the anterior margin; about four very 

 hmall obsolete gray spots, of which one is each side near the 



[Vol. V. 



