AMERICAN COLEOPTERA. Hu 



eyes small, oval. Maxillary palpi four-jointed, last joint small, acieular. 

 Head rounded, broadly concave in front. Prothorax wider than the 

 head, deeply bilobed, lobes converging behind and covering the scu- 

 tellum, rounded in front, triangular space between them membranous. 

 Elytra a little longer than the prothorax, convex, sparsely pilose with 

 long erect hairs, epipleurae not distinct. Abdomen coriaceous, cylin- 

 drical, not margined, sparsely pilose with long erect hairs. Legs 

 moderate, tarsi five-jointed, tibiae somewhat compressed, spinose to a 

 greater or less extent, first joint of middle and hind tarsi as long as the 

 tibiae, and longer than the remaining four united; claws slender. 



This genus is nearly allied to TricJiopsenius Horn, and has the same 

 peculiar connate metacoxal plates; it differs chiefly by the prothorax 

 not wider towards the base with an apical membranous space, and by 

 the elytra with a depressed suture and lateral groove. Examination 

 of well preserved specimens of Trichopsenius shows that all the tarsi 

 are five-jointed, and the first joint of the middle and hind pair longer 

 than the others united, elongate-cylindrical. 



X. ca.vernO!$a. — Brown, shining, sparsely pilose with erect long hairs; 

 base of antennse, palpi, legs and abdomen testaceous,- front slightly and 

 broadly concave; prothorax most profoundly bilobed, about twice as wide as 

 long, prolonged behind at the middle; elytra twice as long as the prothorax, 

 deeply impressed along the suture, and with a deep but short groove near the 

 sides. Abdomen twice as long as the elytra, convex, inflated, sparsely punctu- 

 late. Length 1.6 mm. 



Columbus, Texas; E. A. Schwarz; one specimen with Termes ; 

 other specimens were seen, but escaped. From the form and size of 

 the abdomen this is evidently a $ . 



X. f)>Sl$ata. — Broader subdepressed, (resembling in general appearance an 

 Anthobium), dark brown shining, sparsely pilose with long erect hairs; base 

 of antennae, pali^i and legs testaceous. Head broadly and deeply concave in 

 front. Prothorax three times as wide as long, with a large very deep triangular 

 excavation extending from the front margin to the base, which is broadly 

 rounded. Elytra more than twice longer than the prothorax, very deeply 

 sulcate along the suture, and with a lateral groove as in the preceding; ex- 

 posed part of abdomen hardly equal in length to the elytra, sparsely punctu- 

 late. Length 1 mm. 



One specimen with the preceding, of which it is perhaps the % , 

 although from the difi'erence in the form of the prothorax I think 

 it unlikely. 



X. pressa. — Of the same form as X. fossata, but smaller, dark brown, 

 shining, sparsely pilose with long erect hair, palpi and legs somewhat testa- 

 ceous. Head but slightly concave in front. Prothorax transverse oval, fullv 

 three times wider than long, broadly but feebly impressed in front, membrane 



