570 Coleojiterological Notices, VII, 



. Dalmosellan. gen. — The general form of the body in this genus 

 is nearly as in Melba, but narrower and slightly less convex. The 

 antennae differ quite distinctly in structure, being shorter and 

 more compact, with the ninth and tenth joints larger, the latter 

 transversel}'^ triangular and the eleventh more evenly and acutely 

 conical ; the cephalic fovese are larger and. strongly pubescent, the 

 eyes more developed and the abdomen slightly narrowed or con- 

 stricted at the base. The mesoparapleurse are obliquely divided by 

 a fine suture, the epimeron much the larger, with its posterior 

 margin strongly defined by a transverse, anteriorly arcuate suture 

 extending from the coxae to the elytral margin ; adjoining this 

 line posteriorly, there is a large pubescent fovea. The flanks of 

 the elytra have a fine line extending from about basal third to the 

 apex and parallel throughout to the side margin. Dalmosella in- 

 cludes some of the most minute of the Pselaphidae, and, besides 

 the tj'pe described below, I am inclined to assign to it the 



Trimium americanum and T. simplex of LeConte, the former 

 being 0.6, the latter 0.5 mm. in length. 



D. tenuis n. sp. — Narrow, subparallel, moderately convex, impunctate, 

 pale brownish-testaceous throughout, the pubescence moderately short, sub- 

 decumbent, quite coarse and not very dense. Head a little narrower than the 

 prothorax and quite distinctly wider than long, the eyes rather large and well 

 developed, convex, finely faceted and at about }4 of their own length from the 

 base, the tempora much less prominent, convergent and obtusely rounded be- 

 hind them ; occiput just visibly impressed at base but not sulcate ; fovese 

 large, deep, pubescent, at about the middle of the length and separated by a 

 little less than 3^ the entire width, united by a very feeble arcuate impression 

 scarcely extending J-^ the distance to the frontal margin, the latter arcuate at 

 tip ; antennae very short, scarcely }4 longer than the head, the two basal joints 

 larger as usual aud subequal, the second somewhat angularly prominent within, 

 three to seven equal in width, short and compactly joined, eighth a little wider, 

 transversely oval, ninth still wider, lenticular, almost symmetric, tenth wider 

 and transversely triangular, eleventh conical, only }^ wider than the tenth, 

 as long as the five preceding combined. Prothorax slightly wider than long, 

 widest at about the middle, the sides convergent and rounded anteriorly, the 

 transverse biarcuate sulcus distinct, deep on the descending flanks constricting 

 the prothorax between basal third and fourth, the surface bordering the stric- 

 ture anteriorly not very prominent but more strongly pubescent ; sulcus not 

 dilated at the middle ; disk even. Elytra not quite as long as wide, % longer 

 and % wider than the prothorax, the sides broadly arcuate, nearly parallel and 

 but feebly divergent from the slightly exposed humeri, widest behind the mid- 

 dle ; disk moderately convex, the sutural groove rather deep, the discal re- 

 duced to a large subelongate basal fovea as in Trimium. Abdomen rather 



