Casey — Observations on the Staphylinidae. 403 



straight thence to apical two-flfths, then distinctly converging to the 

 base; punctures rather coarse, deep and approximate in the series, the 

 dorsal of 11-12, the sublateral of 7-8, both unusually regular; there is 

 also a coarse Isolated puncture near the sides anteriorly; elytra elon- 

 gate, longer and much wider than the prothorax, strongly punctured in 

 even series throughout, except rather broadly and gradually more 

 densely toward the suture; abdomen as in nigritulus. Length 5.2 mm.; 

 width 0.76 mm, Colorado (Denver),— H. F. Wiclsham. 



lustraus n. sp. 



Testaceous, shining, the head and abdomen darlcer; head convex, elongate, 

 slightly wider behind, coarsely and sparsely punctured toward each 

 side, the frontal grooves long and deep; antennae not longer than the 

 head; prothorax a third longer thaa wide, slightly narrowed behind, the 

 base and apex rounded; dorsal series of six punctures, also with a 

 curved sublateral row as usual; elytra distinctly punctured in series; 

 abdomen sparsely and feebly puuctulate. Length 2.2 ram. California 

 (Fort Yuma; pallidalus Lee. 



I am unable to distinguish between tiie specimens in my 

 cabinet, which were carefully compared with the original 

 types of Jlavipes and seriafus and believe that they represent 

 but one species. This is undoubtedly the form which has been 

 identified as the European batychrufi, but it is not the same, 

 being much larger in size and of heavier build ; it is however 

 very closely aUied to hatycJirus.* The species described by 



* Under the name batychrtis, I have lately received two distinct species 

 from Mr. Reitter, one of which seems to be undescribed; it may be out- 

 lined as follows : — 



Form very slender, only moderately convex, parallel, shining, the head 

 deep black, the prothorax black anteriorly but gradually shading into a 

 blackish-piceous posteriorly, the abdomen piceous and the elytra pale, 

 diaphanous, flavate, shaded blackish toward base and narrowly toward 

 the suture nearly to the tip; legs pale, the antennae dusky testaceous; 

 head narrow, decidedly elongate, the sides very feebly diverging behind 

 the eyes and straight for a long distance to the rounded basal angles; 

 punctures small but deep, close-set toward the sides, the under surface 

 finely strigllatc, finely and sparsely punctate, the post-ocular line fine- 

 ly, closely and confusedly punctate, impunctate near its upper margin; 

 prothorax narrow, much elongated, not quite as wide as the head, with 

 dorsal and sublateral series of many small but distinct, close-set 

 punctures, with a patch of confused punctures externally toward apex; 

 elytra elongate, as long as the prothorax and evidently wider, punctured 

 in even series except toward the suture; abdomen narrow, parallel, 

 feebly punctulate. Length 3.8 ram.; width 0.53 ram. Europe (Caucas- 

 us) perexilis n. ep. 



Differs from batychrus in its much more slender form, narrower and more 

 elongate head and prothorax and more linearly punctate elytra. 



