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 Laemophloeus, 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 
Rey, the peculiar dense sculpture having probably suggested 
a relationship with the Stilici, for it is evidently very close to 
Lathrobium. The genus Dacnochilus, although differing 
rather radically in the labrum and form of the prothorax, is 
really closely allied to Linolathra, 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 inits 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- 
