NORTH AMERICAN BOSTRICHIDAE 21 



KEY TO THE SPECIES OF ENDECATOMUS 



Lateral margins of elytra with a row of straight, short, stiff, erect hairs; 

 arcuate hairs on disk of elytra short, recumbent, and without a distinct 

 spur; seventh antennal segment transverse dorsalis Mellie, p. 21. 



Lateral margins of elytra with a row of long, arcuate hairs; arcuate hairs 

 on disk of elytra long, erect, with a distinct spur; seventh antennal segment 

 round or slightly elongate rugosus (Randall), p. 21. 



Endecatomus dorsalis Mellie 



Endecatomus dorsalis Mellie, 1848, Soc. Ent. de France Ann. (ser. 2)6: 218; Mel- 

 sheimer, 1853, Cat. Coleopt. U. S., p. 85; Gemminger and Harold, 1869, Cat. 

 Coleopt., v. 6, p. 1795 ; Horn, 1878, Amer. Phil. Soc. Proc. 17 : 540 ; Lesne, 1935, 

 Soc. Ent. de France Bui. 40 : 198 ; 1938, in Junk (pub.) , Coleopt. Cat., pt. 161, p. 5. 



Elongate (more than twice as long as wide) , uniformly dark brown, 

 reddish brown or yellowish brown, with the palpi and antennal club 

 slightly paler. 



Head transversely depressed behind clypeus, coarsely, confluently 

 granulose or tuberculose, rather densely clothed with short, semierect, 

 yellowish hair; clypeus broadly truncate or feebly, arcuately emarg- 

 inate in front. Antenna short, extending to base of elytra, rather 

 densely clothed with short, semierect hairs; eighth segment slightly 

 transverse. 



Pronotum strongly, irregularly convex, slightly wider at base than 

 at apex, widest behind middle ; sides slightly flattened, strongly mar- 

 gined, oblique anteriorly, and broadly rounded posteriorly, the margins 

 coarsely crenulate; anterior margin strongly lobed at middle; base 

 broadly subtrimcate ; surface feebly, longitudinally depressed at 

 middle, densely uniformly granulose or tuberculate, sparsely, irregu- 

 larly clothed with semierect, arcuate, yellowish hairs, which are denser 

 and straight along lateral margins. 



Elytra at base subequal in width to pronotum behind middle: sides 

 parallel, conjointly broadly rounded at apices; disk strongly convex: 

 surface sparsely, coarsely, irregularly granulose, sparsely, irregularly 

 clothed with short, recumbent, arcuate, yellowish hairs on disk inter- 

 mixed with short, stiff, erect hairs toward apices, the arcuate hairs 

 without a distinct spur, and with a row of straight, stiff, erect hairs 

 along lateral margins. 



Body beneath finely, densefy, uniformly granulose. sparsely 

 clothed with short, recumbent, yellowish hairs. 



Length 4.5-5 mm., width 2 mm. 



Type locality. — Texas; location of type not known to writer. 



Distribution. — From material examined : 



Texas: No locality, Linell Collection. Dallas (Hubbard and Schwarz). 



Missouri : Cadet. 



Illinois: Southern part, May 16, 1891 (H. Soltau). 



Host. — Xot recorded, but probably is some of the woody fungi. 

 Endecatomus dorsalis is usually more elongate than rugosu -. 



Endecatomus rugosus (Randall) 



Cis rugosus Dejean, 1835. Cat. Coleopt., ed. 3, p. 310 ; nomen midn i) ; 1 :'<i ed. "> 

 rev., p. 335 (nomen nudum) : Melsheimer, 1858, Cat Golec] s. . S3. 



TriphyUus rugosus Randall, 1S38 Boston Jonr. 



Endecatomus rugosus LeCdnte, 1861. Snrtbsn rnst. isc oil ct. 3 (3): 207' 

 Austin, 1875. Boston Soc. Nat. Hist. Proc. 17: 3 , 1878, A] 



Soc. Proc. 17: 540-541; Blatchley, 1910, Coleoptera of Indiana, pp. 887 888; 



