THE PEA AND BEAN WEEVILS. 1235 



I. SPERMOPIIAGUS Schon. 1833. (dr., "seed + eating. ") 



This genus is represented east of the Rocky Mountains by a sin- 

 gle medium-sized oval species having the hind tibiae compressed, 

 cylindrical and armed with two unequal jointed spurs, the inner 

 one short and placed at right angles to the tibia. 



2287 (7111). SPEBMOPHAGUS ROBINLE Fab., Syst. Eleut, II, 1801, 397. 



Oblong-oval, feebly convex. Dull reddish-brown, clothed with grayish- 

 yellow pubescence; thorax clouded with piceous; elytra with small black 

 spots arranged in five irregular transverse rows. Thorax nearly semicircu- 

 lar, truncate in front, base at middle truncate, bisinuate each side; surface 

 sparsely and rather coarsely punctate, with dense flue punctures in the in- 

 tervals. Elytra broadest at middle, their tips broadly rounded ; surface 

 striate, the stria? punctate ; intervals feebly convex, densely punctate. Length 

 7-7.5 mm. 



Throughout the State, frequent ; more so in the southern coun- 

 ties. March 11-November 7. Probably hibernates. The larva live 

 in the seeds of the black locust and the honey locust or thorn, and 

 the adults usually occur on the foliage or beneath the bark of these 

 trees. 



II. BRUCHUS Linn. 1767. (Gr., "a locust without wings.") 



A large genus of small, robust oval species, 

 quite variable in color and separated by Dr. 

 Horn mainly by the armature of the hind fe- 

 mora. The beetles must therefore be mounted 

 so that the femora can be readily examined. Of 

 this character he says : ' ' The tooth of the hind 

 femur is situated near the outer end at about 

 one-fourth from the knee, on the lower edge and 

 (except as noted in key) on the inner side. Be- Fig.sss. 

 tween the tooth and the knee is an emargination J n : n 

 of greater or less depth in which the denticles are Div - Ent ) 

 situated." The following species have been taken or should occur 

 in the State: 



KEY TO INDIANA SPECIES OR GROUPS OF SPECIES OF BRUCHUS. 



. Thorax with tooth at middle of sides ; hind femur with tooth on outer 

 side only. 2288. PISORUM. 



aa. Thorax not toothed on the sides. 



ft. Disk of thorax elevated, with a median groove; hind femur with a 

 strong tooth and three denticles. L!l'S9. MIMUS. 



?>?>. Disk of thorax simply convex, not elevated. 



c. Hind femur without tooth or denticles; elytra black with a large 

 red space on each near the sides. DISCOIDEUS. 



