STUDIES IN THE AMERICAN BUPRESTIDif: I5I 



male of other species, the concavity limited only by a narrow ridge at 

 each side, the median apical tooth triangular but fmely aciculate. 

 Length (9) 17.5 mm.; width 6.2 mm. Lake Superior (Whitefish 

 Point) rigida n. sp. 



Form very stout, moderately convex, the lustre feeble, deep black throughout 

 above, feebly metallic at the side margins, bronzed beneath; head 

 coarsely, densely and subevenly punctato-rugose, the eyes moderately 

 developed but only slightly convex; prothorax in outline nearly as in 

 rigida but with the lateral inflation at the middle, the sulcus not quite so 

 broad but ending posteriorly in a similar large transverse cavity, the 

 central callus prolonged posteriorly in a fine line; surface from the 

 bounding ridges to the sides coarsely, very densely and confusedly but 

 evenly punctato-rugose, without callous spots and not obliquely im- 

 pressed behind the middle; elytra at least a third wider than the pro- 

 thorax, scarcely more than twice as long as wide, the sides rather ab- 

 ruptly rounding and strongly converging posteriorly in more than apical 

 two-fifths or from only slightly behind the middle, the prolongation 

 gradually formed, not very long and somewhat finely acuminate; sur- 

 face nearly even, with fine, unevenly punctured sulci throughout the 

 width, densely rugulose laterally, the elevations small, few in number 

 and inconspicuous; under surface ( 9 ) v^dth the prosternal concavity not 

 quite so broad as in rigida and more coarsely sculptured, the ridges of 

 the fifth ventral uniting at the apex, the latter narrow, wholly occupied 

 by the shallow sinus, the lateral lobes acute, the median tooth narrowly 

 triangular, very acute and extending beyond the lateral lobes. Length 

 ( 9) ig.o mm.; width 6.8 mm. Ontario (Port Hope), — C. J. S. Beth- 

 une) tetrica n. sp. 



I have identified as prolongata Lee, a female specimen from an 

 unrecorded locality in British America. It answers the description 

 very w^ell, except as to the proportions of the prothorax, the latter 

 being evidently less than twice as wide as long, but this is unimpor- 

 tant, since the width in terms of length was habitually overdrawn by 

 LeConte, as in the case for example of Spinthoptera valens, pre- 

 viously referred to. The elytra are somew^hat inflated behind the 

 middle, the sides gradually rounding and rather rapidly converging 

 in more than apical two-fifths, the attenuated apex much prolonged 

 and rather acuminate but gradually formed and very different from 

 the same part in divaricata and allies, w^ith vv^hich the species was 

 united in complete synonymy by Kerremans. The above description 

 of prolongata is wholly drawn from the characterization published by 

 LeConte in his monograph (1859). If we admit that tenehrica Kirby, 

 belongs to this group, and not near tenehrosa, of the next group, and 

 the few published characters seem to warrant this assumption, it 



