TENEBRIONIDAE. 231 



Of these genera Coelocnemis, Cibdelis, and Scotobaenus are Cali- 

 fornian; Centronopus contains two species, C. opacus Lee, with- 

 out wings, found near the Rocky Mountains ; C. calcaratus Lee. 

 (Tenebrio calc. Fabr.), winged, from the Atlantic States. The 

 type and only species of Merinus is Tenebrio Isevis Oliv., a large 

 insect of a dull black color ; that of Pachyurgus is Iphthinus eereus 

 Mels. ; to Xylopinus belong Tenebrio anthracinus Knoch, and 

 rufipes Say, all from the Atlantic States. To Upis belongs U. 

 ceramboides Fabr. (reticulatus Say), which is found throughout 

 the northern portion of the continent ; Haplandrus comprises 

 Trogosita femorata Fabr. (Upis fulvipes Herbst.), and two 

 other species. 



Singular sexual characters are observed in the anterior and 

 middle tibiae of Centronopus, in the anterior tibiae of Xylopinus, 

 and in the anterior and hind tibias of Merinus ; in the last named 

 the hind femora are also armed with a small tooth. No very 

 marked sexual differences are seen in TJpis, Haplandrus, Scoto- 

 bamus, or Cibdelis, nor in the genera with entire epipleuraa. In 

 Coelocnemis the hind tibiae of the male are furnished with a dense 

 brush of hair on the inner face near the tip. 



Group III.— TE1VEBRIONES. 



In this group the body is elongate oval, or elongate, and 

 winged ; the hind coxae are moderately distant, the legs are 

 slender, and the tibial spurs are more conspicuous than in the 

 other two groups, the tarsi are clothed beneath with a rigid pu- 

 bescence ; the epipleurae are variable in length. The mentum is 

 flat and trapezoidal. 



Our genera are : — 



Epipleurae extending to the tip of the elytra. Tenebrio. 



Epipleurae uot reaching the tip of the elytra. Bius. 



Some of the species are found under bark, and others in articles 

 of commerce. To Bius must be referred Tenebrio eslriatus Lee, 

 from California and Hudson's Bay Territory. 



Tribe VI.— HETEROTARSIIVI. 



This tribe contains a few winged species of small size, and ovate 

 form ; they are remarkable for the coarseness of the punctures, 

 and are sparsely clothed with erect hair. 



