Casey — Observations on the Staphylinidae. 367 



punctate, the sides somewhat flattened, with a large setigerous forea 

 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 flne, 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 *Xanthohypiius 



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

 the middle and united with the lower margin somewhat before the 

 middle; sides of tha head not modifled 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; mand; iles narrowly and deeply grooved externally; antennae with 

 the secou 1 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 Nadobins 



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 18 



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.. XanthoIinUB 

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

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

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

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

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

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

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

 comlng 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 Xantholinua. Palaearcticand Nearctic 

 regions Oyrohypnns 



