Casey — Observations on the Staphylmidae. 409 



abdomen subparallel, slightly narrower than the elytra, finely but 

 strongly, asperately and closely punctured throughout, the fifth segment 

 subequal to the two preceding combined. Length 3.2-4.2 mm.; width 

 0.6-0.68 mm. Rhode Island and Pennsylvania to Iowa and Missouri. 



longlcollis Lee. 



There may be some subspecies of the type form represented 

 among the numerous specimens before me, but I have been 

 unable to definitely limit them. Some examples have vir- 

 tually no minute ground sculpture on the under surface of 

 the head, while in two specimens from Missouri this sculpture 

 is very conspicuous. LeConte states that the species is usually 

 found in ants' nests, but it is apparently not a true 

 inquiline. 



Liithocharodes Shp. 



In most of its characters, including palpal structure, this 

 genus is allied closely to the two preceding as before intim- 

 ated, but there are several features which strongly differen- 

 tiate it from either of them. The antennae, though compact 

 and strongly incrassate distally, have the third joint unusually 

 elongate as well as the second, a departure in the direction of 

 LeptoUnus, and, behind the lower part of the eyes, there is a 

 longitudinal area which is unmistakably flattened as in Gyro- 

 hypnus and allies, although here the area is not so distinctly 

 defined; again, the acute lateral margin of the prothorax is 

 strong and distinct to the apex in JSfematoUnus but here it 

 gradually becomes very feeble anteriorly though not obliter- 

 ated as is the case in LeptoUnus. The gular sutures differ 

 greatly from those of the two preceding genera in rapidly 

 approaching each other and becoming parallel and very 

 approximate from a point before the middle to the base. 

 The integuments are highly polished, without minute ground 

 sculpture to any noticeable extent, the third palpal joint of 

 the same general form as in the two preceding genera, but 

 the fourth joint is relatively shorter, oblique and acutely 

 pointed though evidently conical and not extremely slender 

 and aciculate, and the anterior angles of the prothorax are not 

 obliterated. The median frontal grooves are moderately de- 



