40 



GEO. H. HORN, M. D. 



In the above description there will be observed two differences from 

 that by Bonvonloir, who says the metasternal epimera are invisible, 

 and in the form of the antennte. In the female the antennal joints 

 somewhat resemble those of Prionus, while in the male they are dis- 

 tinctly bipectinate, the branches l)eing as long as the joint, the front 

 branch arising from the distal end of the joint, while the posterior 

 arises from the basal end. Sarpedon is closely related to Hylochares, 

 but the two differ in the form of the clypeus and the structure of the 

 antennae. 



One species is known. 



S. scabrosus Bonv. — Black, subopaque, apical margin of the thorax red- 

 dish brown, the pubescence extremely short and sparse ; head coarsely, densely 

 and roughly punctured, front triangularly impressed above 

 the base of the clyjieus and with a moderately deeply im- 

 pressed line extending to the occiput ; clypeus much nar- 

 rower at base than the distance to the eyes ; thorax quad- 

 rate, as long as wide, sides straight, slightly arcuate near the 

 front angles alone, hind angles not carinate, disc convex, 

 1 >1 "Ip3«3v ^ median rather broad depression, a transverse depression 



j/ liHfiffl \^ on each side in front of middle and one on each side at base 

 ^' " ^*^ oblique, surface densely and very roughly punctate : elytra 



striate, the intervals convex, roughly densely punctate ; 

 body beneath more shining than above, densely puuctate, 

 the punctures of the prothorax large and variolate, of the 

 pectus large and coarse, on the abdomen dense and gradually 

 finer to the apex ; legs piceous, the tarsi ferruginous. Length .22 - .26 inch ; 

 6.5 mm. 



The length of this species as given by Bonvonloir is 10 mm., but 

 the line on the plate as drawn by Migneaux is 5 mm., the former is 

 certainly incorrect. 



Occurs in Canada, Tennessee, Nebraska, but is very rare. 



NE3IATODKS Latr. 



Form elongate, cylindrical, more or less attenuate posteriorly ; antennae fili- 

 form, usually slightly thicker externally ; head deeply inserted, convex, eyes 

 slightly convex ; clypeus narrowed at base, apex arcuate at middle, on each side 

 slightly sinuate ; mandibles rather broad and coarsely punctured ; prothorax 

 usually longer than wide, the sides straight at posterior two-thirds, the lateral 

 marginal line entire, the prosternal sutures straight, the propleurse of elongate 

 triangular form with vague antennal depressions ; metasternal episterna narrow, 

 parallel, the epimera not visible ; hind coxal plates widely dilated internally ; 

 last ventral segment more or less prolonged in a point ; legs rather slender, the 

 first joint of the hind tarsi as long (or nearly so) as the following joints together, 

 fourth joint excavate-emarginate and slightly lol)ed beneath ; claws simple. 



