VORTH AMERICAN COLEOPTERA. 143 



This genus of Histeridte must be associated with Hetaerius and its 

 allies, Echinodes and Eretmotes, from which it differs in having the 

 club oval, and in great part spongy pubescent over its entire surface ex- 

 cept for a space on the upper side. In this respect it is more closely 

 related to Scapicoelis, which is not placed in close relationship with Hetae- 

 rius by Marseul. The essential differences between the present genus and 

 Scapicoelis are in the form of the presternum — emarginate at tip and 

 each side bistriate in Scapicoelis, the mesosternum sinuate in front, the 

 anterior tibiae broadly emarginate externally and not denticulate. The 

 eyes in Ulkeus are more coarsely granulate than in any Histeride I have 

 examined. 



In the preceding description the antennae are given as lO-jointed, 

 while all the figures of Hetaerius and Scapicoelis give but nine joints. 

 In a careful examination of the antennae of the present genus made 

 necessary by the sketch given, it was found that the large joint which is 

 usually called the first really consists of two, the suture being well marked. 

 This, led me to an examination of Hetaerius, and on removing an antenna 

 of H. BlancJiardi the same structure became evident. 



In our genus Tribalister the club is solid, the entire surface pubescent 

 and the entire antennae is constructed after the usual mode in Histeridae, 

 with the scape long. A more careful examination of the antennae of 

 those genera in whicli the apparent first joint is very large and thick 

 would probably show the structure indicated for Ulkeus and figured on 

 the accompanying plate. 



U. intricatus n. sp. — Oval, convex, castaneous shining. Head smooth, 

 vertex with two elevated lines convergent above. Thorax a little more than twice 

 as wide as long, margin acute, outline somewhat sinuous, surface shining, a deep 

 arcuate groove limited externally by an elevated ridge beginning opposite the 

 base of the tirst dorsal stria extending forward and joining that from the opposite 

 side, a finely elevated line starts from opposite the base of dorsal striae 2-3-4 arch- 

 ing forward and joining a net-work at the middle, the line opposite the second 

 dorsal very sinuous; a few large punctures bearing short erect setae placed near 

 the lateral margin, many placed along the sinuous line, a few near the two inner 

 lines. Scutellum small but distinct. Elytra with five entire striae, the sutural 

 interval with a row of coarse setigerous punctures, striae 1-4 deep, with coarse, 

 rather closely placed punctures each bearing one, often two erect setae, a very short 

 marginal stria extending one-third from the base bearing punctures and setae: 

 intervals smooth and shining. Pygidium and propygidium with sparsely placed 

 setigerous punctures. Body beneath smooth shining, a few fine punctures on the 

 metasternum with a few others coarser and setigerous placed near a line of sculp- 

 ture at middle, and others along the posterior border. Abdomen smooth, first 

 segment with a row of setigerous punctures close to the metasternum. Legs 

 smooth, a fine marginal line on the middle and posterior tibiae beneath. Length 

 .06 inch; 1.5 mm. (PI. 4, fig. 9-10.) 



