Casey — Observations on the Staphylinidae. 331 



interspaces with the nsaal fine bat evident regular micro-reticala- 

 tion 13 



13 — Prothorax large, the sides parallel, arcnate, becoming strongly con- 



vergent anteriorly only near the apex. Body stout, convex, rather 

 shining, piceous-black, the pronotnm and basal parts of the abdomen 

 slightly but not very distinctly paler; head with a small deep impres- 

 sion continued to the base by a fine feeble impressed line ; prothorax 

 fully three-flfths wider than long, distinctly, transversely impressed 

 near the base ; elytra much wider and longer than the prothorax, the 

 humeri distinctly exposed at base; abdomen rather wider than the elytra. 

 Length 1.45 mm. ; width 0.58 mm. Iowa (^Cedar Rapids). 



robnstala Csy. 



Prothorax notably small in size, the sides evidently converging from base to 



apex, more arcuately and strongly so toward the latter 14 



14 — Form rather slender, moderately convex, strongly shining, piceous- 



black, the prothorax very slightly paler, blacklsh-piceous to pale ru- 

 fous; basal parts of the abdomen dark to pale rufous; legs pale, the 

 antennae black, testaceous toward base ; pubescence not very long, 

 reclined or partially erect, longer and erect on the abdomen poste- 

 riorly ; punctures extremely fine throughout; head with the usual rounded 

 vertexal impression, narrowly continued to the base by a subobsolete 

 impressed line, the eyes small, anterior and rather prominent; antennae 

 Blender, strongly incrassate distally, attaining basal third of the elytra ; 

 prothorax about a third wider than the head and one-half wider than 

 long, with a short transverse impression before the middle of the base; 

 elytra at tip nearly one-half wider than the prothorax, almost one-half 

 longer, the sides distinctly diverging from the humeri, which are well 

 exposed basally, the suture impressed for some distance behind the 

 scutellum; abdomen parallel with nearly straight sides, not quite as 

 wide as the elytra in the male, fully as wide as the latter in the female. 

 Length 1.6 mm.; width 0.5 mm. Mississippi (Vicksburg) and Texas 

 (Galveston) rigida n . sp. 



Form slightly stouter, moderately convex and shining; coloration through- 

 out nearly as in rigida, the pubescence rather longer, paler and more 

 distinct; punctuation very fine throughout as usual; head with the usual 

 small deep rounded impression at the middle of the vertex, continued 

 to the base by a rather distinctly impressed median line ; eyes very 

 prominent, rather small in size; antennae slightly longer than the bead 

 and prothorax, nearly as in rigida and many other species ; prothorax 

 small, the sides strongly converging anteriorly from the narrowly 

 rounded basal angles, nearly as in rigida throughout; elytra rather 

 larger, the sides less diverging from the humeri, which are distinctly 

 and broadly exposed at base, the suture only obsoletely and very nar- 

 rowly impressed behind the scutellum, three-fifths wider and fully one- 

 half longer than the prothorax; abdomen parallel with feebly arcuate 

 sides, almost as wide as the elytra. Length 1.75 mm.; width 0.6 mm. 

 Idaho (Coeur d'Alene), — H. F. Wickham 4igoreta n. sp. 



Form rather stouter, smaller in size, normally convex, subalutaceous, pi- 

 ceous, the head and abdomen blackish, the prothorax and bas-al parts of 

 the abdomen testaceous; legs and antennae pale flavo- testaceous, the 



