STUDIES IN THE AMERICAN BUPRESTID^ 63 



the sides straight and parallel to apical two-fifths, thence rapidly 

 rounded and oblique to the rather obtuse apex, the humeral swelling 

 not conspicuous; disk without costa?, their positions indicated by greater 

 convexity and sparser punctures of the surface, which is evidently 

 striate suturally, finely and only moderately closely punctate even 

 sublaterally, the two apical spines unusually developed. Length 15.7- 

 21.0 mm.; width 5.7-7.8 mm. New Mexico (Demming). 



pistorius n. sp. 

 Lustre moderately shining, obscure greenish-metallic, the surface more 

 convex than in either of the preceding species and with the head decid- 

 edly smaller, the large polished rugosities more extensive than the 

 punctuation; antennae {d") with the third joint barely as long as the 

 fourth, the latter and succeeding joints moderately compressed, parallel 

 except basally; prothorax two-thirds wider than long, of the usual form, 

 much narrowed anteriorly, the basal angles abruptly everted, acute 

 and very prominent; surface covered with strong polished confused 

 elevations, the punctures of the interspaces rather coarse, fine along 

 the basal margin; elytra subparallel, the sides nearly straight for three- 

 fifths, thence rounding, oblique, and becoming nearly straight to the 

 apex; surface nearly even and almost equally convex throughout, the 

 sublateral punctures not very close-set; striae obliterated, except the 

 sutural and three more visible double striae on each, also a fourth visible 

 apically near the sides and more tumid; under surface irregularly and, 

 for the most part, finely and closely punctate. Length 20.0 mm.; 

 width 7.3 mm. Arizona (Winslow),— H. F. Wickham. 



acutangulus n. sp. 

 8— Surface metallic-green with feeble aeneous tinge, only moderately shining; 

 pubescence ashy as usual, rather distinct, feebly subvittate on the elytra; 

 head nearly as in pistorius but with fewer rugaj and greater extent of 

 dense punctures, particularly before the middle, closely and conspicu- 

 ously pubescent; antennae (c^) nearly as in pistorius but with the third 

 joint much more elongate, being decidedly longer than the fourth; 

 prothorax short, nearly four-fifths wider than long, rounded at the 

 sides, unusually narrowed but with arcuate sides to the apex, the basal 

 angles unusually feebly everted; surface nearly as in pistorius; elytra 

 evidently wider than the prothorax, the sides very feebly converging 

 and feebly arcuate for three-fifths, thence slightly more arcuate and 

 gradually strongly convergent but arcuate to the tip; surface nearly as 

 in pistorius; under surface more unevenly punctate. Length 22.5 

 mm.; width 8.7 mm. Arizona pimaUcus n. sp. 



Surface much more polished and pale brassy-green in color, generally not 

 at all cupreous, feebly pubescent, the pubescence inconspicuous and 

 scarcely at all vittate on the elytra; head in great part coarsely and 

 closely rugose, rather sparsely pubescent; antenna; (c?) with the third 

 joint slender but scarcely as long as the fourth; prothorax very trans- 

 verse ( 9) or much less so (c?), the sides more arcuate but rather less 

 converging anteriorly than in pimalicus, the hind angles much more 

 prominently everted and acute; surface nearly similar, except that the 

 Proc. Wash. Acad. Sci., April, 1909. 



