Casey — Observations on the Staphylinidae. 367 



punctate, the sides somewhat flattened, with a large setlgerous fovea 

 posteriorly just before the basal angles, the flattened part bounded be- 

 neath by a feebly prominent longitudinal ridge ; epistoma small, short, 

 truncate; inner frontal grooves long but fine, parallel, the oblique 

 ocular grooves coarse, deep and well developed; mandibles not grooved 

 externally; fourth palpal joint much longer than the third, rather 

 strongly acuminate in apical half; elytra subserially and distinctly 

 punctured. Central America *Xantliohypnil8 



10 — Side margin of the prothorax rapidly deflexed anteriorly from near 

 the middle and united v.'ith the lower margin somewhat before the 

 middle; sides of the head not modified behind the eyes, the basal angles 

 rounded; gular sutures united; maxillary palpi with the fourth joint 

 about equal in length to the third, rather obtusely accuminate toward 

 tip; raand oles narrowly and deeply grooved externally; antennae with 

 the secoti I and third joints equal or subequal, each but slightly elongate 

 and somewhat rounded; median pair of frontal grooves long and strong, 

 feebly converging, the oblique ocular grooves short and feeble; punc- 

 tures normal; neck two-fifths as wide as the head; middle coxae well 

 separated; basal joint of the hind tarsi shorter than the second; body 

 rather large in size. Europe and North America Nndobins 



Side margin of the prothorax gradually and only feebly deflexed anteriorly, 

 remaining distant from the lower margin to the apex; basal angles of 

 the head rounded as a rule; mandibles grooved externally 11 



11— Middle coxae distinctly separated as usual; neck two-fifths as wide as 

 the head 12 



Middle coxae contiguous; neck very slightly narrower; third antennal joint 

 abnormal 15 



12 — Second and third antennal joints equal in length or nearly so, each 



rather distinctly elongate but shorter than the fourth and fifth com- 

 bined IS 



Second antennal joint slightly elongated, much shorter than the third, the 

 latter evenly obconical and about equal in length to the next two com- 

 bined 14 



13 — Maxillary palpi of the usual form, elongate, the fourth joint spindle - 



form, acuminate only toward tip, as long as the third joint or nearly so; 

 gular sutures united; epistoma minute, truncate at tip ; median frontal 

 grooves strong, slightly converging, the ocular feeble ; punctures coarse, 

 normal; basal joint of the hind tarsi as long as the second or nearly so; 

 species rather large. Europe and Pacific coast of ^^ America.. Xanthoiinns 

 Maxillary palpi normally slender but with the third joint shorter than in 

 Xantholinut, the fourth very much longer than the third and acutely con- 

 ical; second and third antennal joints relatively smaller, the forraerfre- 

 quently slightly the larger of the two and more rounded than in Xan- 

 tholimis; epistoma very small, truncate; median frontal grooves moder- 

 ate, parallel, the oblique ocular rather distinct; punctures normal but 

 less coarse than in Xantholinus; gular sutures arcuately converging,be- 

 coming extremely approximate only behind the middle ; first four joints 

 of the hind tarsi decreasing very gradually in length ; body generally 

 smaller and more slender than in Xantholimts. Palaearcticand Nearctic 

 regions Gyrohypnns 



