The Pselaphid^ of North America. 287 



interval between the sutural strias of the elytra; behind the 

 intermediate coxa^ on the metasternum is a deep, sharply 

 defined fovea. * antenna? longer, elytra less convex, punc- 

 tuation and pubescence stronger, intermediate tibiae spurred, 

 first ventral near the posterior margin transversely impressed, 

 last ventral with a somewhat transverse, nearl}- circular, well 

 defined, but not deep impression. Length, 1.5 mm. 



Habitat. Canada. Differentials are: the strong punctua- 

 tion, the long, divergent and very approximate abdominal 

 striie. 



B. GEMMiFER, Acc. Ferruginous to red-brown or darker, 

 pubescence very fine and short. Head from base to frontal 

 margin as long as the width across the tempora, impunctate, 

 except on the antennal tubercles, fovea? equal in size, small, 

 mutually twice as distant as either from the eye and in a line 

 with them; frontal margin sHghtly convex, antennal tubercles 

 small, but well defined, space bearing the frontal fovea slightly 

 concave. Eyes longer than the tempora, gemmate. Anien- 

 ncB half as long as the bod}-, second joint as long as the first, 

 not as thick; third longer than the second, obconical-cylin- 

 drical, thinner; third to seventh cylindrical, subequal; eighth 

 as thick as the seventh, of equal dimensions; ninth little longer 

 and thicker, obconical; tenth subglobular, larger; eleventh 

 nearly double as thick as the tenth, in length equal to the 

 three preceding conjointly, from the middle strongly conical 

 and somewhat oblique. Prothorax more convex than in B. 

 riibicunda ; middle fovefe small, deep, conspicuous, lateral ones 

 not larger than the occipital foveae, not fully in view from 

 above, and situated one-third from the base. Disk conspic- 

 uously punctulate (magnified thirty diameters) ; base double 

 as wide as the anterior marcjin. Ehira across the shoulders 

 wider than the prothorax, sides arcuate behind the middle, 

 where the disk is one-fourth wider than the length of the 

 suture, convex; tip and sides very declivous, posterior margin 

 laterally slightly sinuate. Disk (magnified sixty diameters) 

 scarcely perceptibly punctulate, except on the posterior decliv- 



