CBRAMBYCIDAE. 307 



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

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

 palpi short, equal, not dilated. Antennae punctulate and seri- 

 ceous, longer than the body in some , shorter in <?. Front 

 coxae as above ; mesosternuni flat, broadly emarginate behind in 

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

 more prominent than usual, nearly inclosed externally. Abdo- 

 men with segments gradually diminishing in length, 5th segment 

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

 tarsi with 1st joint twice as long as the 2d ; the legs and pro- 

 notum are clothed with long flying hairs. The elytra are elon- 

 gated, and subulate in Callimoxys ; short, dehiscent, and sepa- 

 rately rounded at tip in Molorchus. The stridulating surface is 

 large and undivided in Callimoxys ; very imperfect, oblong, mar- 

 gined each side, slightly elevated in the middle, and nearly des- 

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

 maxillae in Callimoxys is elongated nearly as in Rhopalophorus. 



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

 chus; to Callimoxys belong the species heretofore referred to 

 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 differ from (the description of) the 

 European by having the mesosternum broad, and the thighs 

 suddenly and strongly clavate, but these characters are probably 

 not of generic value, and the figure of C. gracilis (Duval, 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. RHOPALOPHORINI. 



A single genus Rhopalophorus (Tinopus Lee.) represents 

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

 small, slender insects, of blackish-gray plumbeous color, with red 

 prothorax ; the head is elongate, the front rather large, oblique, 

 concave, with the epistoma and fabrum more prominent than 

 usual; the eyes are finely granulated, and deeply emarginate ; 

 genae long, mandibles very acute ; mentum transverse, of usual 

 form, palpi short, equal, not dilated, outer lobe of maxillae as long 



