KEY TO THE LONG-HORNS. 



Scutellum acutely triangular; front coxal cavities 



open behind; eyes finely granulated 



Tribe Trachyderini (p. 345). 



13. Tibial spurs large; pronotum never with tubercles 

 or spines 14. 



Tibial spurs small; legs long and slender; femora very 

 slender at base, strongly and suddenly club-shaped at 

 apex. Tribe Rhopalophorini. Rliopalophora longipes is 

 about .3 in. long; bluish-black; pronotum red, with a 

 small obtuse tubercle on each side. 



14. Tibae strongly ridged; form slender; puncturation 

 (pittings) sparse and coarse. Tribe Stenosphenini. 

 Stenosphenus notatus, breeding in hickory, is black; prono- 

 tum reddish with a central black spot; under side of head 

 and thorax reddish; about .4 in. long. 



Tibiae not ridged; form rather stout; puncturation 

 fine. Our species usually have the elytra banded with 

 yellow, or white, and black pubescence; eyes finely granu- 

 lated and deeply emarginate, the lower lobe always 

 large Tribe Clytini (p. 346). 



Asemini. (See page 339.) 



1. Color, black or dark brown; form, cylindrical, scarcely 

 depressed 2. 



Color, pale yellowish; form, depressed; length, about 

 .3 in.; eyes coarsely granulated and very deeply emargi- 

 nate. Occurs under unloosened bark of dead poplar, oak, 

 and other trees Smodicum cucujiforme. 



2. Eyes not wholly divided, often deeply emarginate. ... 3. 

 Eyes divided, apparently four in number, rather 



finely granulated; length, about .5 in.; dull, sooty brown. 

 Northern Tetropium cinnamopterum. 



3. Eyes moderate in size, finely granulated and hairy; 

 antennae finely pubescent; length, .5 in. or more; black. 

 Northern Asemum mcestum. 



Eyes large, coarsely granulated, not hairy; about 

 I in. long Criocephalus. 



341 



