398 Trans. Acad. Sci. of St. Louis. 



and very much wider, the punctures fine, impressed, very sparse 

 throughout and sublinear in arrangement; abdomen finely, sparsely 

 punctulate, more distinctly beneath. Length 8.0 mm.; width 1.3 mm. 



Arizona (Walnut), — H. F. Wickham abdominalis n. sp. 



Similar in form to the last and similar in coloration, the integuments 

 very highly polished; head oval in form behind the antennae, the frontal 

 grooves distinct, the ocular terminating inwardly in a rather large 

 punctiform pit, the punctures extremely minute and sparse, rather larger 

 but quite as remotely separated beneath, the flanks evenly convex and 

 without trace of the feebly flattened post-oculur streak of abdominalis ; 

 sides arcuate, merging gradually into the very broadly rounded basal 

 angles; prothorax not so elongate and more broadly and feebly areuato- 

 truncate anteriorly, a third longer than wide and distinctly narrower 

 than the head, the punctures rather more distinct, the dorsal series of 

 8-9, the arcuate sublateral of about seven, both series indistinct in 

 apical third and fourth, the dorsal extending to basal flfth or sixth; 

 there are some scattered punctures anteriorly and along the side margins 

 as usual, and two large apical punctures and one at each basal angle 

 bear each a very long tactile seta as in the preceding; elytra a little 

 longer and very much wider than the prothorax, the punctures still 

 more minute and indistinct than in abdominalis, very sparse throughout 

 and faintly subserial in arrangement; abdomen very minutely, sparsely 

 and feebly punctulate, only slightly more visibly so beneath. Length 

 8.0 mm.; width 1.28 mm. Utah (southwestern), — Weidt. .oviceps n. sp. 



These species without much doubt constitute a specialized 

 tjpe, coiifined to the arid regions of the Sonoran province ; 

 they have a peculiar facies which will render them easy to 

 identify. 



tiissohypuus n. gen. 



The elongate third antenual joint is the chief character dis- 

 tinguishing this genus from the three preceding, and, in this 

 respect, there is a reversion to Eulissus and related genera. 

 In the united gular sutures, well developed head and form of 

 the fourth papal joint, Lissohyjjnus resembles Xantholinus. 

 In the short third palpal joint, with much longer fourth joint, 

 type of sculpture throughout and flattened post-ocular line, it 

 resembles Gyrohyjmus, but in antennal structure it differs very 

 strikingly from either of those genera. The single species in 

 my cabinet may be readily known by the following outline 

 description : — 



stout, parallel, moderately convex, highly polished, black, the last two 

 abdominal segments pale testaceous in color, the entire elytra and legs 



