Coleopterological Notices, V. 317 



tlie second and third joints equal, the latter obconical, more than twice as 

 long as wide, fourth slightly wider, quadrate, fifth to tenth transverse, the 

 latter nearly twice as wide as long, eleventh conoidal, slightly compressed, 

 nearly as long as the three preceding. Prothorax nearly twice as wide as 

 long, transversely subelliptical in outline, strongly convex, with a large deep 

 median dent which does not difi"er at all in the nature of its pubescence. 

 Elytra rectangular, parallel, three-fifths wider than long, equal in length and 

 width to the prothorax, broadly, strongly emarginate at base in circular arc. 

 Abdomen much longer than the anterior parts, at base nearly as wide as the 

 elytra ; sides feebly arcuate, evenly, feebly convergent from the base ; border 

 thick and strong ; surface nearly flat : first and second segments deeply, trans- 

 versely impressed, the third more feebly ; fifth a little longer than the fourth ; 

 under surface convex, finely, densely punctate. Legs rather slender, the 

 posterior tarsi distinctly shorter than the tibiae. Length 1.8-2.5 mm. ; width 

 0.6-0.85 mm. 



Nevada (Reno). 



The female differs from the above-described male in its slightly 

 larger size and more robust form, unexcavated head, and in having 

 a simple, equal, broadly and feebly impressed line along the middle 

 of the pronotum from base to apex. 



T. imbricatllS n. sp. — Nearly similar in form to caviceps, piceous-black, 

 the legs^ base of the antennae and apices of the abdominal segments paler ; 

 head and pronotum dull, very minutely reticulate, strongly and densely so in 

 the pronotal dent ; elytra more coarsely reticulate, more shining and more 

 strongly, rather densely punctate ; abdomen polished, finely punctate and 

 evenly imbricate ; pubescence of the anterior parts short, coarse, rather dense, 

 very dense, longer and conspicuous in the pronotal indentation, sparse on the 

 abdomen. Head small, scarcely three-fifths as wide as the prothorax, feebly, 

 evenly convex ; eyes large, at less than their length from the base ; antennse 

 barely as long as the head and prothorax, feebly incrassate, second and third 

 joints equal, the latter obconical, three times as long as wide, as long as the 

 next two, eleventh conoidal, not longer than the preceding two. Prothorax 

 twice as wide as long; sides evenly convergent from base to apex, broadly, 

 evenly arcuate ; base much wider than the apex, broadly arcuate ; basal 

 angles obtuse but not blunt, very distinct ; disk convex, with a large abrupt 

 median excavation occupying one-third of the width, extending from the base 

 nearly to the apex. Elytra very slightly longer and wider than the prothorax ; 

 sides subparallel, broadly arcuate. Abdomen — extended — nearly twice as long 

 as the anterior parts, at base nearly as wide as the elytra ; sides gradually 

 convergent from the base ; border thick but not very deep ; surface nearly 

 flat ; first three segments moderately impressed at base ; fourth broadly 

 emarginate at apex and much shorter than the fifth ; middle coxae widely 

 separated, the mesosternal process broadly truncate. Length 1.6-2.4 mm. ; 

 width 0.55-0.7 mm. 



