350 A Pt'eliminary Monogra2)h of the 



23 T. diffusus n. sp. — Slender, deep black throughout the body, 

 legs, antennae, and oral organs; pubescence short, fine, and sparse; 

 integuments shining. Head very slightly narrower than the prothorax, 

 slightly wider than long, broadly convex, very coarsely and somewhat 

 sparsely punctate; prominences small, moderate; antennae robust, about 

 as long as the head and prothorax, abruptly clavate; second joint rather 

 robust, twice as long as wide, one-half longer than the third, the latter 

 very slightly longer than the fourth, which is scarcely as wide as long, 

 tenth slightly transverse; eyes small, very feebly convex, finely faceted; 

 tempora fully as long as the eye, broadly rounded and not very promi- 

 nent. Prothorax nearly one-half wider than long, widest at anterior 

 third, where the sides are moderately broadly rounded and nearly 

 coarctate to the apex, convergent and straight toward base; the latter 

 feebly arcuate, fully three-fourths as wide as the disk and rather dis- 

 tinctly narrower than the apex, which is transversely truncate; apical 

 angles obtuse, not rounded; basal distinctly rounded; disk with two 

 straight, feeble, longitudinal impressions, the entire surface finely retic- 

 ulate, but more strongly so in the impressions and near the sides, very 

 coarsely and sparsely punctate, the punctures round, very shallow, 

 variolate, nearly one-half as wide as the third antennal joint, and sepa- 

 rated by from once to twice their own diameters. Elytra distinctly 

 longer than wide, one-third wider than the prothorax, and about twice 

 as long; humeri right, very narrowly rounded; surface of each feebly 

 impressed along the suture, rather coarsely, deeply punctate; the punc- 

 tures impressed, much deeper, but not as large as those of the prothorax, 

 separated by nearly twice their own widths. Abdomen slightly nar- 

 rower than the elytra, parallel; sides very feebly arcuate; border thin 

 and rather deep; surface feebly convex, finely reticulate, minutely and 

 rather sparsely punctate. Legs short, slender; tarsi rather long. Length 

 2.5 mm. 



California (Truckee, Nevada Co. 1). 



No comparative remarks are necessary to distinguish this 

 very distinct species from any other here described. 



24 T. Iap§us n. sp. — Rather robust, feebly convex, piceous-black 

 throughout; antennae, legs, and trophi same; pubescence short, rather 

 coarse and very sparse; integuments polished. Head very slightly nar- 

 rower than the prothorax, wider than long, broadly convex, coarsely and 

 sparsely punctate; prominences moderate in size, strong; antennae very 

 robust, about as long as the head and prothorax; club strong; second 

 joint scarcely more than one-half longer than wide and very slightly 

 longer than the third, fourth slightly wider than long; outer joints 

 transverse; eyes rather small and moderately finely faceted, somewhat 

 convex, very slightly prominent; tempora nearly as long and almost as 

 prominent, broadly rounded. Prothorax one-third wider than long. 



