204 Trans. Acad. Sci. of St. Louis. 



that representatives of so widely distributed a genus should 

 be wanting in the true Pacific coast faunal region of the 

 United States, if we except the extreme southern part of 

 California, and this is rather conclusive evidence that the 

 genus migrated from America to Europe, or the reverse, by 

 way of Greenland, rather than by the usual Alaskan route and 

 probably indicates a European rather than American origin. 

 The species inhabiting our territory, known to me thus far, 

 may be distinguished by the following outline descriptions : — 



Elytra subequal to or longer than the prothorax 2 



Elytra more or less distinctly shorter than the prothorax 18 



2 — Male with a subparallel-sided, narrow notch at the apex of the sixth 



ventral segment, the bottom of the notch broadly and transversely 



rounded 3 



Male with a br^ad emargination occupying virtually the entire apex of the 

 sixth segment, the notch having the form of an incised cusp, the widely 

 diverging sides of the emargination being broadly arcuate 4 



3 — Form parallel, the lustre feebly shining, pale brownish-testaceous 



throughout, except the elytra, which are dusky and the abdomen 

 blackish-piceous; head moderate, convex, slightly longer than wide, 

 the sides parallel and straight behind the well developed convex eyes; 

 base broadly sinuato-truncate, the angles rather narrowly rounded; 

 occiput not impressed, the punctures minute but deep, dense; prothorax 

 distinctly though not very greatly narrower than the head, about a fifth 

 longer than wide, the anterior angles obtuse but very evident and at 

 apical fourth, the sides thence very feebly converging and almost 

 straight to the moderately rounded basal angles; surface more shining 

 than the head, the very minute punctures feebler and less close-set, 

 feebly bi-impressed at the basal margin; elytra nearly a fifth longer than 

 wide, parallel, two-fifths wider and about a third longer than the pro- 

 thorax, very minutely, closely, subasperately punctate; gular sutures 

 well separated. Male with a small subparallel-sided notch somewhat 

 deeper than wide at the apex of the sixth ventral, the bottom of the 

 notch broadly rounded with the edge beveled or concave. Length 

 2.6 mm.; width 0.45 mm. Texas (El Paso) and New Mexico, — Mr. 



Wickham texanus Csy. 



Form less parallel, the elytra relatively much wider, similar in coloration, 

 the lustre alutaceous, the minute sculpture rather denser; head well 

 developed, but little longer than wide, larger than in texanus but other- 

 wise nearly similar; prothorax relatively smaller and narrower, much 

 narrower than the head, fully a fifth longer than wide, similar to that 

 of texanus, except that the basal angles are more broadly rounded and 

 the two basal impressions more approximate ; elytra subquadrate, 

 parallel, only just visibly longer than wide, one-half wider than the 

 prothorax but only about a fourth longer; gular sutures more approxi- 

 mate, the punctures of the under surface of the head denser and more 



