NORTH AMERICAN BTJPRESTID BEETLES 23 



and broadly, deeply, arcuately emarginate in front ; antennae slender, 

 extending slightly be}^ond middle of pronotum, serrate from the fifth 

 joint, and the outer joints about as wide as long; eyes large, elongate, 

 and about equally rounded above and beneath. 



Pronotum one-third wider than long, base and apex about equal in 

 width, and widest near middle ; sides feebly arcuately rounded, and 

 when viewed from the side the marginal and submarginal carinae 

 are slightly sinuate, narrowly separated anteriorly, and connected 

 to each other behind the middle; anterior margin strongly sinuate, 

 with a broadly rounded, median lobe; base acutely emarginate at 

 middle of each elytron, the median lobe broadly rounded, and feebly, 

 arcuately emarginate in front of scutellum; disk moderately convex, 

 with a broad, median groove extending from base to apex, and more 

 deeply depressed in front and behind the middle, a broad depression 

 on each side along lateral margin, extending obliquely backward 

 from apical angle to the base at acute emargination, and with sharply 

 defined, straight prehumeral carinae, extending from base to near 

 middle of pronotum; surface rather densely, coarsely punctate, 

 feebly rugose, and sparsely clothed with recumbent yellowish hairs 

 and whitish efflorescence, which are more densely arranged in the 

 depressions. Scutellum transversely carinate, and the surface feebly 

 reticulate. 



Elytra slightly wider than pronotum at base, and widest just 

 behind the humeri; sides slightly arcuate behind humeral angle, 

 feebly, arcuately constricted in front of middle, slightly arcuately 

 expanded behind middle, then obliquely narrowed to the tips, which 

 are feebly expanded, strongly serrate, and conjointly broadly, arcu- 

 ately emarginate at middle; sides of abdomen scarcely visible from 

 above; disk slightly depressed, with a distinct longitudinal costa on 

 each side, a rather deep depression along sutural margin, and with 

 broad, moderately deep basal depressions; surface feebly imbricate- 

 punctate, sparsely clothed with short, recumbent, yellowish white 

 pubescence, except on the longitudinal costae, and with four more or 

 less distinct, denuded spots on each elytron, one near base, one at 

 basal third, a broader one behind the middle extending nearly to 

 lateral margin, and an elongate one along lateral margin near the 

 apex. 



Abdomen beneath finely punctate, the punctures rather widely 

 separated on the median part, but becoming denser toward the sides 

 of the segments, and rather densely clothed with recumbent, yellow- 

 ish white hairs toward the sides; vertical portions of the segments 

 not more densely pubescent than ventral surface; first segment 

 -rongly convex and without a median depression; pygidium longi- 

 ldinally carinate at the middle, but the carina not projecting. 



