The Pselaphid^ of North America. 303 



Habitat. California (San Mateo Co.,) Plate IX., Fig. 17, 

 antenna. ,'. 



This may be identical with B. conipcir of Leconte, which is 

 described as having similar antenna;, densely punctured prono- 

 tum and brown color. 



B. TU^HDA, Lee. Clear brownish-yellow, pubescence fine, 

 very short, plentiful, appressed, elytra and dorsal surface of 

 the abdomen extremel}' fine, punctulate. Length, 1.2 mm. 



Head, exclusive of the eyes, as wide as the length from the 

 tip of the frontal margin to the base; front tubercles not 

 prominent, fovea; in a line through the middle of the eyes 

 about four times as distant as either from the eyes, occiput 

 evenly convex, frontal margin produced to a point, frontal 

 fovete very small, slightly impressed on the nearly flat inter-an- 

 tennal space. Antcnnce $ half as long as the entire body, joints 

 one to four rapidly decreasing in size, quadrate; first, one- 

 half the width of the fifth; fourth, one-third of the first; fifth 

 and sixth oval, longer than wide, and as wide as the length 

 of the eye; seventh and ninth, gradually increasing; seventh, 

 equal to fourth, and half as wide as ninth, which is slightly 

 transverse; tenth, larger, not as wide as fifth or sixth, the 

 last as wide as fifth, ovate, one-third longer. Clypeus and 

 labrum prognathous, the latter rounded with a small fovea 

 near the lateral margins. Prothorax as long as the head and 

 one-third wider, evenly convex, middle fovea; small puncti- 

 form, lateral ones in full view from above, not much larger 

 than the occipital fove^e, base w^ith a transverse row of small 

 punctures. Elytra one-half longer than the prothorax and 

 equal to the shoulder width; across the posterior fourth, one- 

 third w'ider, disk evenl}- convex, sutural lines straight, parallel, 

 interval not roof-shaped, discal lines arcuate, convergent, 

 obsolete in the posterior fifth. Abdomen, first segment one- 

 fourth as long as the width, lateral anterior corner roundly 

 depressed, carince including one-third of the segmental width. 

 Legs rather long and robust. 



5. Distinguishing marks are the above mentioned form of 



