300 CALIFORNIA ACADEMY OF SCIENCES. 



T. experta n. sp — Form rather slender, sides parallel; body b'ack 

 throughout, legs piceous, tarsi dark rufo-testaceous; antennae black through- 

 o\at; integuments polished; pubescence very fine, moderately dense, coarser 

 longer, more erect and more conspicuous, though moi-e sparse, on the abdo- 

 men. Head rather depressed, including the labrum rather longer than 

 ■wide; sides behind the eyes arcuate and rather strongly convergent; neck 

 broad; eyes rather large, not prominent, very finely granulated; front nearly 

 flat between the eyes, excessively minutely and rather sparsely punctate; 

 labrum prominent, wider than long; antennae distinctly longer than the head 

 and prothorax together; three basal joints slender, slightly decreasing in 

 length, joints four to ten equal in length, the former scarcely twice as long as 

 wide, the latter as wide as long, eleventh as long as the two preceding 

 together, slender, acuminate, slightly compressed. Prothorax widest at one- 

 third its length from the apex where it is slightly wider than the head, and 

 slightly wider than long; sides moderately convergent and distinctly arcuate 

 to the apex, and slightly less convergent and nearly straight to the base 

 which is broadly, evenly and moderately arcuate, but slightly narrower than 

 the disk, and distinctly wider than the apex; the latter nearly squarely trun- 

 cate; apical angles strongly obtuse and slightly rounded, basal less strongly 

 obtuse and very slightly rounded; disk moderately convex, nearly flat in 

 the middle, finely, evenly, sub-asperately and rather densely punctate. Scu- 

 tellum ogival, slightly wider than long, densely asperate Elytra at base 

 slightly wider than the pronotum; sides parallel and feel>ly arcuate, more 

 strongly so toward the apex; apical angles slightly produced, acute; together 

 a? long as wide, one-fourth longer than the pronotum, broadly and feebly 

 incur vate at apex; disk rather depressed, distinctly impressed on the suture 

 near the base, extremely minutely, evenly and rather sparsely punctate; 

 punctures much smaller and sparser than those of the pronotum. Abdomen 

 at base as wide as the prothorax; sides feebly divergent and straight to the 

 apex of the fifth segment where it is slightly narrower than the elytra; first 

 three or four segments deep'y and transversely impressed at base-, the bottom 

 of the impressions being very coarsely and closely punctate, remainder mi- 

 nutely and rather sparsely punciate; border rather narrow, deep and prom- 

 inent; underside very minutely, evenly and rather sparseley punctate; first 

 three segments rather strongly convex longitudinally. Legs and tarsi mod- 

 erate in length, very slender; first joint of the posterior tarsi much lunger 

 than the second, slightly shorter than the next two together; first four joints 

 decreasing nearly uniformly in length; claws extremely slender, moderate in 

 length. Length 3.4 mm. 



California (Gualala Riv., Mendocino Co., 2). 



The type is a male, and has the apex of the sixth segment 

 conspicuously bilobed at apex, the notch being triangular 

 in outline, nearly twice as wide as deep, and rather small in 



