NORTH AMERICAN BUPRESTID BEETLES 175 



Abdomen beneath finely, sparsely punctate at the middle, becoming 

 densely punctate and transversely rugose at the sides, and sparsely 

 clothed with short, inconspicuous hairs ; first segment convex at mid- 

 dle, and without a median groove; last segment broadly rounded at 

 apex; vertical portions of the segments sparsely but not conspicu- 

 ously clothed with long, whitish hairs ; pygidium longitudinally cari- 

 nate anteriorly, but the carina not projecting. Prosternum sparsely, 

 coarsely punctate, and sparsely clothed with very short, inconspicuous 

 hairs ; prosternal lobe broad, strongly declivous, and broadly, deeply, 

 arcuately emarginate in front; prosternal process broad, the sides 

 parallel to behind the coxal cavities, then obliquely narrowed to the 

 apex, which is rounded. Tibiae slender, the anterior and middle 

 pairs feebly arcuate, and armed with a short tooth on the inner mar- 

 gin at apex. Posterior tarsi distinctly shorter than tibiae, and the 

 first joint as long as the following three joints united. Tarsal claws 

 similar on all feet, cleft near the middle, the inner tooth broader and 

 shorter than the outer one, and not turned inward. 



Length, 8.5 mm. ; width, 2.25 mm. 



Female. — Differs from the male as follows: More robust, head, 

 pronotum, and beneath cyaneous, elytra reddish cupreous, antennae 

 shorter, extending slightly beyond anterior margin of pronotum, and 

 the outer joints wider than long, eyes more elongate, abdomen more 

 broadly exposed above, and the tibiae unarmed at apex. 



Length, 10 mm.; width, 2.75 mm. 



Redescribed from a pair taken in coitu in the Huachuca Mountains, 

 Ariz., August 2, 1905, and in the collection of Alan S. Nicolay. 



Type locality. — Pinos Altos, State of Chihuahua, Mexico. 



DISTRIBUTION 



Arizona: Huachuca Mountains, August 2, 1905 (Nicolay collection), Carr Can- 

 yon, Conchise County, Huachuca Mountains, August 1905 (H. Skinner). 

 Mexico: Type locality. 



Variations. — No variation was observed in the three examples (two 

 males and one female) examined. The male specimen in the Nicolay 

 collection is abnormal, and has joints six and seven of both antennae 

 connate. 



Host. — Unknown. 



This species is remarkable for its sexual color dimorphism, which, 

 so far as known, is only found in one other North American species 

 {walsinghami Crotch). The species is allied to co-ncinnus Horn, but 

 can be easily separated from that species by the different coloration 

 of the sexes, sides of the pronotum not pubescent, and by numerous 

 other characters. 



