THE CYLINDRICAL BARK BEETLES. 555 



1061 (3276). COLYDIUM LINEOLA Say, Journ. Phil. Acad. Nat. Sci., V, 1826, 



264; ibid. II, 324. 



Elongate, cylindrical, slender. Piceous black, moderately 

 shining, legs and antenna? paler. Thorax much longer than 

 wide, the disk with a deep impressed line at center and an- 

 other abbreviated one on each side, surface rather coarsely 

 punctured. Elytra not wider than thorax, each alternate in- 

 terval finely ribbed, the interspaces with two rows of punc- 

 tures. Length 4-6.5 mm. (Fig. 208.) 



Throughout the Stale; frequent. April 9-October 

 23. Occurs especially beneath bark of linden and locust 



Fig. 208. X6J. 

 logS. (Original.) 



Tribe III- PYCNOMERINI. 



Elongate, somewhat flattened species, covered with coarse punc- 

 tures and having the elytra marked with rows of very large punc- 

 tures; hind coxa? small, oval, widely separated; first joint of tarsi 

 longer than either of the next two, the third longer than fourth. 

 Two genera are known. 



KEY TO GENERA OF PYCNOMERINI. 



(i. Antenna? 11-jointed, the club 2-jointed. VII. PENTHELISPA. 



. Antenna 1 10-jointed, the club composed of a single joint. 



VIII. PYCNOMERUS. 



VII. PENTHELISPA Pasc, 1861. (Gr., "sorrow + smooth.") 

 Two species belong here, both of which may occur in the State. 



KEY TO SPECIES OF PENTHELISPA. 



(/. Thorax slightly wider than long, not narrowed behind; hind angles 



prominent. H.EMATODES. 



fl. Thorax longer than wide, slightly narrowed behind ; hind angles not 



prominent. 1062. REFLEXA. 



P. h(f mat odes Fab., brownish, shining, length 3.5 mm., is said to 

 occur rarely from Pennsylvania to Texas. 



1062 (3285). PENTHELISPA REFLEXA Say, Jouru. Phil. Acad. Nat. Sci., V, 



1826, 262; ibid. II. 322. 



Elongate, subdepressed. Dark reddish-brown, shining. Antenna' stout, 

 shorter than thorax, the latter wi; li disk deeply and marsely punctured. 

 Elytra slightly wider than thorax, disk flattened, deeply and broadly striate. 

 the stripe coarsely and closely punctured; intervals very narrow. Length 

 4-5 mm. 



Marion, Perry and Posey counties; scarce. May 13-November 

 28, Occurs on trunks of dead locust. 



