292 COLEOPTERA OF NORTH AMERICA. 



Group II. — Stenopteri. 



A group cliaracterized by the front coxal cavities being widely 

 angulated externally, but entirely closed behind, and the abdomen 

 normal in both sexes. The head is porrect, the front large and 

 oblique, with the labrum prominent, the epistoma not separated; 

 the eyes are finely granulated and deeply eniarginated; the man- 

 dibles are very acute, the mentum rather larger than usual, the 

 palpi" short, equal, not dilated. Antennae punctulate and serice- 

 ous, longer than the body in some Z, shorter in 9. Front co.\a3 

 as above; niesosternnm flat, broadly emarginate behind in Calli- 

 nioxys, triangular, and truncate in Molorchus; coxae globose, 

 more prominent than usual, nearly inclosed externally. Abdomen 

 with segments gradually diminishing in length, 5th segment 

 shorter in %. Legs rather long, thighs strongly clubbed, hind 

 tarsi with 1st joint tw^ice as long as the 2d; the legs and prono- 

 tum are clothed with long flying hairs. The elytra are elongated, 

 and subulate in Callinioxys ; short, dehiscent, and separately 

 rounded at tip in Molorchus. The stridulating surface is large 

 and undivided in Callimoxys; very imperfect, oblong, margined 

 each side, slightly elevated in the middle, and nearly destitute of 

 transverse lines in Molorchus. The outer lobe of the maxillae in 

 Callimoxys is elongated nearly as in Rhopalophorus. 



Helioraanes and Glaphyra Newm., are not different from Molor- 

 chus ; to Callimoxys belong the species heretofore referred to the 

 European genus Stenopterus; the two genera occur. on both sides 

 of the continent, the latter is remarkable for having the hind tibiae 

 curved inwards, and furnished on the outer side with two rows 

 of acute tubercles, giving a serrate appearance. 



Our species of Callimoxys diff'er from (the description of) the 

 European by having the mesosternum broad, and the thighs 

 suddenly and strongly clavate, but these chnracters are probably 

 not of generic value, and the figure of C. gracilis (DuYal, Gen. 

 Col. Eur., iv. pi. 45, fig. 210) would do equally well for one of 

 our species. The prothorax varies from red to black, the latter 

 color prevailing in the %. 



Tribe V.— RHOPAtOPHORIlVI. 



A single genus Rhopalophorus {Tinopus Lee.) represents this 

 tribe in the Middle, Western, and Southern States; they are 



