APPENDIX. 329 



quadrate; mandibles pale testaceous; thorax convex, 

 rounded, two faint impressed lines each side behind con- 

 verging to the scutel, and on the posterior margin two in- 

 distinct dull whitish spots ; scutel elevated, convex ; feet 

 dark piceous ; thighs nearly black ; luings, costal nervure 

 indistinct ; abdomen depressed fusiform, acute at tip. 

 Length more than one-twentieth of an inch, 



BETHYLUS, Latr. 



B. rufipes. Black ; antennae and feet rufous. 



Inhabits North-west Territory. 



Body slender, polished, black ; mouth rufous ; thorax 

 punctured ; wing joint ochreous ; abdomen, incisures and 

 terminal segment obscurely piceous. 



Length less than one-fifth of an inch. 



This insect is also an inhabitant of Missouri. 



PROCTOTRUPES, Latr. 



P. caudatus. Pale testaceous; oviduct as long as the 

 abdomen. 



Inhabits North-west Territory. 



Head with a blackish, transverse line between the an- 

 tennae; thorax and scutel impunctured ; icings hyaline, 

 with a very slight ochreous tinge, stigmata very distinct, 

 and with the costal nervures fuscous, the other nervures 

 light brownish, the process of the radial nervure continued 

 transversely to the middle of the disk of the wing, is not 

 only extended from that point to the extremity of the 

 wing, but also towards the base of the wing, terminating in 

 this direction at the first transverse nervure. 



