POWDER-POST BEETLES. SS7 



the frontal margin, the three outer joints always larger; front 

 coxae large, globose, subconical ; spurs of middle and hind tibiae dis- 

 tinct ; front tibite usually serrate and terminated by one long spur ; 

 first joint of tarsi short, sometimes obsolete; fifth joint long, with 

 simple claws. Four genera are represented in the collection at 

 hand, while another probably occurs in the State. 



KEY TO INDIANA GENERA OF BOSTRICHIN.E. 



a. Thorax with distinct and entire side margins; head covered in part by 



the thorax. I. ENDECATOMUS. 



<i. Thorax without side margins; head entirely covered by the thorax, the 



latter usually roughened in front by small elevations. 

 b. Intermediate joints of antenna? shorter than the first and second; 

 tarsi long, slender, first joint very short. II. SINOXYLON. 



66. Intermediate joints of antenna; longer than the first and second. 

 c. Tarsi as long as the tibife, slender, second joint long. 



(/. Front margined, at the sides at least. III. BOSTRICHUS. 



till. Front not margined. IV. AMPIIICERUS. 



cc. Tarsi short, second joint not elongated. V. DINODERUS. 



I. ENDECATOMUS Mellie. 18-17. (G-r., "eleven + joint.") 



Head in great part covered by the thorax, the latter margined 

 from base to tip ; antenna 11- jointed, with a loosely united 3- jointed 

 club ; terminal spur of front tibiaa large and hooked ; last joint of 

 tarsi very long. Two species are known from the Eastern United 

 States, both of which occur in Indiana. 



KEY TO SPECIES OF ENDECATOMUS. 



(/. Under surface conspicuously granulate; male with two small tubercles 

 in front. 1684. BETICULATUS. 



aa. Under surface obsoletely granulate; male without frontal tubercles. 



1685. EUGOSUS. 



1684 (5336). ENDECATOMUS RETICULATUS Hbst. Kafer, V, 70. 



Elongate, rather slender. Dull reddish-brown, rather thickly clothed 

 with yellowish hair. Thorax broadly arched, sides rounded, disk with a 

 median impressed line, both it and the elytra granulate and pubescent as in 

 rtiffosus. Length 4.5 rnm. 



Two in Webster collection labelled "Ind." Said to be an in- 

 troduced European species. Paler and more slender than rngosus, 

 and less densely pubescent above. 



*1685 (5337). ENDECATOMUS RUCOSUS Rand., Bost. Jmirn. Nat. Hist, II, 

 1838, 26. 



Elongate-oblong. Dark or piceous brown, opaque, covered with tufts 

 of pale brown, wool-like hairs. Thorax rather closely and coarsely granu- 



