202 ACADEMI OF NATURAL SCIENCES 



Body veildish-brown, partially covered with short, prostrate 

 cinereous hair, inequally distributed : trophi pale rufous : man- 

 dibles black at tip : antennae longer than the body ; third, fourth, 

 fifth and sixth joints terminated each by a spine, the first one 

 largest, two-thirds the length of the next joint : thorax with two 

 tubercles before the middle, two longitudinal ones at base, and a 

 longitudinal line, glabrous : scutel white, with dense hair, divided 

 into two lobes : elytra punctured ; hair so disposed as to give the 

 surface an irregularly maculated appearance; tip bispinose ; in- 

 termediate and posterior thighs bimucronate ; the inner spine 

 longest. 



Length seven-twentieths of an inch. 



This species is not the ^S'. marylandicus of Fabr., as described 

 and figured by Olivier, which is a much larger and more dilated 

 insect; the thighs not niucronatc, and the joints of the antennre 

 spinous to the tip. It is, perhaps, more closely related to S. 

 . spinicornis Fab., but that insect is described as having the joints 

 of its antennae bispinous at tip. 



It is a common insect in many sections of the United States 

 and is by no means rare in Pennsylvania; [428] we obtained 

 specimens on the Missouri, Platte, and Arkansa rivers. 



[Belongs to ElnphuHon. — Leg.] 



MOLORCHUS Fabr. 



M. BIMACULATUS. — Black, hairy; elytra testaceous on the 

 disk. 



Inhabits the United States. 



Molorchus bimaculatus Knoch in Melsh. Catal. 



Antennae, palpi and feet rufous : thighs clavate : elytra testa- 

 ceous ; basal, exterior, and posterior margins black. 



l^jngth nearly one-fourth of an inch. 



The feet vary in being sometimes fuscous. 



DONACIA. 

 D. i^QUALls. — Brassy, with two dilated, indented, subsutural 

 spots on the elytra, and an indented, humeral line ; two elevated 

 linos between the eyes. 

 Inhabits Missouri. 



Body aeneous, polished, punctured, glabrous : head with short, 



[Vol. III. 



