SPHAERIUS. 381 



tiiitennao yellowish. L. i 1. Not uncommon. 



S. acar aides, Waltl. 



COR YL oniinA E. 



A, Third tarsal joint heart-shaped ; last joint nearly as 

 long as the other three together. 



Body oval ; antennae nine-jointed, with first joint rather 

 thicker than and as long as second, third and fourth equal, 

 very small, scarcely longer than broad, fifth large, sixth 

 very small, last three large, dilated inward into a little 

 tooth ; mandibles strongly curved, apex simple ; first and 

 second joints of tarsi equal in size, division between them 

 scarcely perceptible. Orthoperus, Steph. 



J?. All tarsal joints simple ; last joint rather longer than 

 the other three together. 



a. Antennae nine-jointed. 



Body somewhat elliptic, rather narrowed liehind ; an- 

 tennae with first joint long and thick, second rather shorter 

 and thinner, next two small, fifth larger, sixth as large as 

 fourth, last three considerably enlarged ; mandibles with 

 shar]), long apex, and very finely comblike on inner margin ; 

 third joint of tarsi much smaller than second. 



CoryIo2^hus, Steph. 



h. Antennae ten-jointed. 



Body ovate, broadest at base of elytra ; antennae with 

 first two joints large and long, third thin, conical, next four 

 short and as broad as third, eighth and ninth as long as 

 broad, short conical, tenth ovate ; mandibles short, hollowed 

 out within ; sawlike at apical margin ; third joint of tarsi 

 much smaller than second ; posterior angles of thorax pro- 

 duced. Scricoderus, Steph. 



c. Antennae eleven-jointed. 



Body elliptic, not very convex ; antennae w^ith first joint 

 large, oblong, second large, conical, next four joints short 

 and thin, seventh large, eighth small, last three large ; 

 mandibles split at apex into three or four strong teeth ; 

 third joint of tarsi only a little smaller than second ; pos- 

 terior angles of thorax right angles. Sacium, Lee. 



