Casey — A Revision of the American Paederini. 77 



although differing so radically in the structure of the labrum 

 and hind tarsi. Their very depressed form seems to be cor- 

 related in some way with the very long antennae, and the 

 entire facies bespeaks a habitat under the bark of trees. It 

 is interesting to note, in this connection, the very long an- 

 tennae pertaining to many other very depressed subcortical 

 beetles — notably LaemoiMoeus^ a condition brought about 

 undoubtedly from necessities of this special environment. It 

 is rather singular that the true affinities of Domene should 

 have been overlooked by the European observers, excepting 

 Key, the peculiar dense sculpture having probably suggested 

 a relationship with the Stilici, for it is evidently very close to 

 Lathrohium. The genus Dacnochilus, although differing 

 rather radically in the labrum and form of the pro thorax, is 

 really closely allied to Linolaihra, as shown by the hind 

 tarsi, gular sutures, sculpture and general facies. Acalophaena 

 is a still more specialized form, of remarkably broad and 

 compact build, with long bristling tactile setae at the sides of 

 the body. 



Apteralium n. gen. 



As before remarked, this genus reminds us considerably of 

 Glyptomerus and Domene in its very short elytra with obsolete 

 humeral angles. The hind wings are wanting and represented 

 by very minute vestigial fillets that are wholly inconspicuous ; 

 the elytra are however not connate. Apteralium differs from 

 Glyptomerus^ not only in the rather distinct and not obsolete 

 anterior angles of the prothorax, but in the presence of well 

 developed normal eyes and in the much shorter antennae, 

 also in the relatively much less minute basal joint of the hind 

 tarsi and more widely separated parallel gular sutures. We 

 have two very distinctly characterized species as follows : — 



Body moderately stout, dark piceo-rufous to piceous-black in color 

 throughout, the legs and antennae rufous ; head well developed, slightly 

 wider than the elytra but only just visibly wider than the prothorax in 

 the male, equal to the latter in the female, parallel and nearly straight 

 at the sides, the basal angles moderately rounded; gular sutures 

 straight; punctures coarse and very sparse, rather closer toward the 

 sides; eyes at fully three times their own length from the base; pro- 



