538 Coleopterological Notices, VI. 



third, thence fonveificnt and ahuost straij;ht to the apex and base, the former 

 but sliglitly narrower than the latter and both very feeldy arcuate; Ijasal an- 

 gles verj' obtuse but not wholly obliterated; lateral edges distinctly tinibri- 

 ate but not serrulate; disk finely but strongly, not very closely punctate, 

 the punctures becoming gradually close and feebly rugose toward the sides. 

 Elytra but slightly more than one-half longer than wide, only slightly wider 

 than the prothorax, the sides jiarallel and straight; apex evenly rounded; disk 

 somewhat coai'sely and closely punctured and feebly rugose, the interspaces 

 polished. Under surface rather densely clothed with coarse cinereous pubes- 

 cence. Length 2.6-3.0 mm. ; width 1.0-1. ;2.3 mm. 



Texas (El Paso). Mr. Dunn. 



The male above described has the fifth ventral short and trans- 

 versely truncate, and the inner spur of the anterior and middle 

 tibife dilated. The female difters but slightly, having the head 

 distinctly and the ])rothorax slightly smaller, and the antennjB 

 more slender though only a little shorter ; the female seems also 

 to have the legs a little more slender and pale rufous throughout. 

 Five specimens. 



I.ISTRO:tIIIWl S u. gen. 



The type of this genus is a species remarkabl}- distinct in habi- 

 tus because of its opaque sculpture, dense, even and closely ap- 

 pressed pubescence, feebly constricted prothorax with acute and 

 everted basal angles, and small prominent eyes situated at a con- 

 siderable distance from the base of the head, the neck being nar- 

 rowed posteriorlv. The antennae are rather long and slender, 

 though distinctly incrassate toward apex. The anterior tibiae 

 are cylindrical, with appressed pubescence and without trace of 

 external spines or setiv. The epipleurtv are narrow, vanishing 

 fixr before the apex but with their plane almost horizontal 

 throughout, and the ungual appendages are as long as the claws, 

 subequal and detached from the outer third or fourth of the clnw 

 as in Trichochrous. The remaining characters are those of the 

 tribe in general, the maxillary palpi being rather stouter than 

 usual and the tarsi long and iiliforni. 



1. I>. sericatiis n. sp.— Elongate, suboval, strongly convex, black; legs 

 blackisli-piccous, the under side of the femora rufous, more broadly toward 

 base; antenn:c black, testaceous toward base, the basal joint in great part 

 blackish; head and pronotum opaque, densely and evenly rugose with small 

 irregular and anastomosing punctures, the elytra polished and finely but 

 closely punctured; pubescence whitish -cinereous, closely decumbent, even, 

 coarse, moderate in length and cxtiemely dense, without trace of erect hairs. 



