Casey — Observations on the Staphylinidae. 407 



ally strongly tumescent toward the median line. The type 

 may be described as follows : — 



Body very slender, convex, shining, absolutely parallel, all the segments 

 being equal in width, the head perhaps just visibly wider, pale and 

 almost uniform testaceous throughout, the legs and antennae concolor- 

 ous; head longer than wide, the sides parallel, the basal angles very 

 broadly rounded ; flanks evenly convex, without trace of flattening behind 

 the eyes, the latter well developed as usual ; punctures minute, sparse and 

 inconspicuous, rather stronger but stiil sparser beneath, the under sur- 

 face very obsoletely strigilate, the space between the sutures polished and 

 sculptureless; antennae one-half longer than the head, the basal joint 

 three-fifths as long as the remainder; prothorax elongate, with the 

 sides almost parallel and very feebly arcuate, gradually rounding ante- 

 riorly to the apex, the angles almost obliterated; base arcuately sub- 

 truncate, with the angles much less rounded; side margins strongly 

 acute to the apex; punctures coarser tlian those of the head but still 

 sparser; elytra small, fully as long as wide, very much shorter than the 

 prothorax but of equal width, the punctures fine but strong, evenly and 

 rather sparsely distributed throughout, without trace of lineal arrange- 

 ment; abdomen at base as wide as the elytra, gradually very slightly 

 wider thence to the flf th segment, which is unusually elongate, almost 

 equaling the two preceding combined, the surface unusually convex 

 throughout and duller than the rest of the upper surface, being mi- 

 nutely but strongly reticulate, also finely but asperulately and sparsely 

 punctate. Length 3,7 mm; width 0.6 mm. California (Lake Tahoe). 



tahoensls n. sp. 



It is possible that this species may occur under pine bark, 

 though I made no notes relating to its capture. 



Xematolinus n. gen. 



This genus and the next constitute a rather isolated group, 

 having the prosternum narrower between the anterior parts 

 of the hypomera and strongly incrassate and compact an- 

 tennae ; in the latter, however, as well as in the form of the 

 maxillary palpi, they both agree with the preceding genus, 

 which might with propriety be placed in the same group. In 

 the present genus the frontal grooves are all but completely 

 obsolete and the oblique ocular lines, unlike those of Habro- 

 linus, are wholly obsolete. The gular sutures are peculiar, 

 being feebly arcuate, widely separated anteriorly and grad- 

 ually approaching each other, not becoming very approximate 

 except just before the base, the intermediate surface polished 



