NORTH AMERICAN BUPRESTID BEETLES 157 



Female. — Differs from the male in having the front of head uni- 

 formly reddish cupreous, slightly wider, and sides nearly parallel 

 to each other ; first and second abdominal segments convex at middle ; 

 tibiae unarmed at apex ; and the tarsal claws similar on all feet, cleft 

 near middle, and the inner tooth much shorter than outer one. 



Redescribed from the male lectotype No. 3481 in the Academy of 

 Natural Sciences of Philadelphia. 



Type locality. — Massachusetts (probably from Tyngsboro). 



DISTRIBUTION 



Material examined : 



Maine: Wales, June 23; Monmouth. June 27 (C. A. Frost). Meddy hemps, June 



25 (R. J. Sim). 

 Massachusetts : No definite locality — probably Tyngsboro (Blanchard). 

 New Brunswick: Bathurst, July 2-24 (J. N. Knull). 

 New Hampshire: Bretton Woods, June 30 (Van Duzee). 

 New Jersey: Newfoundland, July 4 (A. S. Nicolay). 

 Nova Scotia: Greenfield, July 13-16 ( ). 



Port Medway, Aug. 14 (P. G. Bolster). 

 Pennsylvania: Charter Oak, July 5 (J. N. Knull). 



Variations. — The coloration is rather constant in the specimens 

 examined, but the depressions on the pronotum vary similar to those 

 in anxius. In some examples the prehumeral carinae on the pro- 

 notum are larger, strongly arcuate, and more distinct than in others, 

 and in some of the examples examined the costae on the elytra are 

 feebly indicated, whereas in others they are entirely obliterated. 

 Length 7 to 8.5 millimeters. 



Hosts. — The larval habits of this species are unknown, but C. A. 

 Frost has collected the adults on the foliage of alder (Alnus incana 

 Linnaeus) and Hop-hornbeam or ironwood (Ostrya virginiana 

 (Miller) Koch). 



This species is very closely allied to anxius Gory, and usually can 

 only be separated from that species by the coloration, which is red- 

 dish cupreous. The head is usually broadly depressed on the vertex 

 and the pubescence on the elytra has a tendency to form a spot on 

 each elytron at the middle and apical third. The groove on the 

 second abdominal segment, which was used by Horn (1891) for 

 separating the males from anxius, is of little use, as it is more or less 

 variable. On examining the lectotype of pensus, this groove was 

 found to be identical with the groove on some specimens of anxius. 



All of the specimens examined are rather uniform in coloration 

 and are from the northeastern part of the United States and Canada, 

 many of which are probably from the type series collected by Blanch- 

 ard. Chamberlin (1926) records it from Illinois, but I have not 



