Casey — Observations on the Staphylinidae. 825 



9btuse and somewhat rounded basal angles, the base broadly rounded, 

 marginedj the surface convex, even, not at all impressed; elytra large 

 with strongly diverging sides, four-flfths wider than the prothorax and 

 about a third longer, transverse, the humeri broadly exposed, the suture 

 not impres!?ed, the inner apical angles rounded; abdomen broad with 

 arcuate sides, at about basal third as wide as the elytra, narrower at 

 base and strongly narrowed toward the tip, the border thin, inclined 

 and very deep, the first tergite alone impressed at base, the others flat; 

 flanks bristling with long black setae. Length 3.0 mm. ; width 0.9i mm. 

 Texas megalops n. sp. 



The single male before me has a longitudinal carina on the 

 fifth tergite, gradually disappearing anteriorly and not quite 

 attaining the tip, the sixth broadly rounded. The singular 

 coriaceous fringe at the apex of the fifth tergite, characteriz- 

 ing all the Staphylinidae, is especially developed here. There 

 is never a trace of this form of apical margin on the first four 

 tergites or on the sixth, and its anatomical significance is 

 wholly unknown to me. 



Xesturida n. gen. 



This genus is allied to Trichuisa, having the middle coxae 

 fully as widely separated, but differs in its more finely faceted 

 eyes, broader metasternal parapleurae, longer and more slender 

 tarsi, with more elongate basal joint of the posterior, this being 

 equal to the next two combined, in its subglabrous integuments 

 and wholly impunctate abdomen. The neck is broad, the 

 antennae more slender than in Trichiusa, and the basal im- 

 pression of the third tergite, distinct in Trichiusa, is obsolete 

 or very nearly so. The single species may be described as 

 follows : — 



Form rather stout, the anterior parts narrow, rather convex, highly polished, 

 not at all reticulate, very minutely, evenly but sparsely and asperu- 

 lately punctulate, except the abdomen, which is wholly without trace of 

 any form of sculpture, the four apical setae of each tergite small and 

 inconspicuous; color pale piceo-testaceous, the abdomen slightly and 

 indefinitely clouded posteriorly except at tip, the antennae dusky except 

 basally; pubescence sparse and pale, rather inconspicuous; head wider 

 than long, parallel, abruptly and feebly constricted at base, the eyes 

 rather large, moderately prominent; antennae attaining the middle of 

 the elytra, the first six joints equally thick, the second and third elon- 

 gate and subequal, the next three subequal and as long as wide, seven to 



