170 AMERICAN COLEOPTERA. 



finely reticulate, and with scattered moderately deep variolate punctures, tem- 

 pera subparallel, a little less prominent than the eyes, angles broadly rounded, 

 base truncate and sinuate, median impressed line short but distinct. Antennae 

 rather long, feebly incrassate, second and third joints subequal, a little longer 

 than those immediately succeeding, fourth to seventh maintaining nearly uni- 

 form size and shape, eighth to tenth proportionately broader and more constricted 

 at base, eleventh acorn shaped, nearly equal in length to the two preceding, con- 

 stricted as usual, the basal portion shorter. Prothorax barely wider than long, 

 widest and strongly rounded at apical third, sides behind rapidly arcuately nar- 

 rowing to about basal third, parallel only very near the base. Basal marginal 

 line distinct ; disk more coarsely and deeply punctured than the head. Elytra 

 near the base a little more than one-third wider than the prothorax, sides sub- 

 parallel, slightly broader behind the middle, thence again narrowing, tips dehis- 

 cent, subtruncate, angles rounded, the outer much more broadly, disk reticulate, 

 craterform punctures well developed in the males, irregularly and not very 

 closely disposed at middle but closer near the base and apex, pubescence directed 

 longitudinally. Abdomen beneath, finely and distinctly reticulate, but shining, 

 sparsely punctured and pubescent. Length 2.8-3.5 mm. 



The fifth ventral of the male is truncate behind, broadly, not 

 deeply sinuate at middle, the posterior margin finely beaded. The 

 characters given above indicate a species allied to salicola, but at 

 once distinguished by its color and by the much stronger craterform 

 punctures. 



Numerous specimens were taken by me on the flats adjoining 

 Owen's Lake, California. They were commonest quite close to the 

 water where the drift and wind had formed cakes of scum, com- 

 posed chiefly of exuviae shed by the larvre of flies. T. inyo might 

 be seen running about, taking flight fairly readily if alarmed, but 

 generally more abundant under the cakes than upon them. 



T. salicola Lee. — Narrow, subdepressed, somewhat shining, rufotestaceous, 

 more or less flavate, pygidium and usually the under side of the abdomen black- 

 ish. Elytra paler than the prothorax, crossed behind the middle by a piceous 

 band. Pubescence rather sparse, that of the elytra directly longitudinally. 

 Head subquadrate, basal impression distinct. Elytra leaving more or less of the 

 pygidium exposed, minutely simply punctate in the female or with craterform 

 punctures intermixed in the male; sides subparallel, apices subtruncate. Length 

 3 mm., a little more or less. 



With tlie al)ove I have united tricolor Casey, believing the name 

 to have been applied to pale female specimens. I have not seen the 

 LeConte types, which, however, were examined by Major Casey. 

 The specimens of salicola from the Ulke collection, kindly loaned 

 by Dr. Holland, are of the pale form. 



As I interpret the species, it occurs at various points in the Great 



