The PselaphidvE of North America. 15 



angles of the pronolum are deeply roveate. Elytra without 

 visible punctures; shoulders prominent longitudinally, not acu- 

 minate; sutural lines parallel, interval with a row of very 

 small punctures; discal lines short, obsolete. Abdomen very 

 convex, the lateral basal pits very deep, feebly punctulate. 

 Sexual differences are the same as in B. zcfhyrinus\ the ven- 

 tral fovea very large, crater shaped, with evenly concave bot- 

 tom. 



Habitat. Eldorado county, California. 



B. ciCATRicosus, Brend. Male, umber brown, elytra, legs, 

 and last joint of the antennae red, pubescence long. Length 

 1.9 mm. Plate X., Fig. 83. 



^^«^/ quadrate, carinale at the sides over the eyes: vertex 

 moderately convex, the carina of the collar scarcely continued 

 to the base of the occiput, in the center inconspicuously com- 

 pressed and surrounded by a deep sulcus, which is posteriorly 

 continued to the base, running straight forward outside of the 

 deep, nude, fovea, and connects with the sulcus of the other 

 side by the deep transverse portion of the frontal impression; 

 the border separated by the sulcus is coarsely but not densely 

 punctured; front continuously declivous with the clypeus. 

 Eyes rather prominent, small, with a lunate base. AtiteiiiicB 

 as long as the head and thorax together; first joint cylindrical, 

 concave above, convex beneath, deeply emarginate above at 

 the tip; second shorter, as thick as the first, oval, longer than 

 wide; third to eighth sub-equal, conico-cylindrical, inconspic- 

 uously longer than wide; ninth and tenth not longer but 

 gradually wider, slightly transverse; eleventh nearly as long 

 as the three preceding together, scarcely truncate at the base, 

 with a tooth proceeding from the distal third, which, however, 

 is not erect; pubescence long. Prothorax impunctate, widest 

 across the anterior third; sHghtly longer than wade; sides 

 irregularly sinuate behind, basal margin elevated in the shape 

 of a sharp transverse carina; discal median sulcus a conspicu- 

 ous, merely impressed fine, originating in the deep, nude, 



