long's second expedition. 221 



rafter in a barn, very busily feeling with its antennas for a proper 

 situation to deposit its eggs. Having found a suitable place, the 

 insect, after some exertion, suddenly disengaged its oviduct from 

 the groove and valves, and gradually thrust the instrument into 

 the wood, nearly to the base; then having for a short time re- 

 mained at rest, probably in order to protrude the egg, the oviduct 

 was withdrawn, adjusted in its dorsal groove; and the insect pro- 

 ceeded again as before, in search of another spot suitable for its 

 purpose. I could not ascertain the kind of larvge, within the 

 wood, that received these eggs. 



PSILUS Jur. 



P. brevicornis. — Black, polished, immaculate; tibiae and 

 tarsi piceous. 



Inhabits St. Peter's river. 



Antennas short, first joint much elongated, second joint longer 

 than the remaining ones, which are subcylindric-quadrate ; [329] 

 mandibles pale testaceous ; thorax convex, rounded, two faint im- 

 pressed lines each side behind converging to the scutel, and on 

 the posterior margin two indistinct dull whitish spots; scutel 

 elevated, convex; feet dark piceous; thighs nearly black; wings, 

 costal nervure indistinct; abdomen depressed fusiform, acute at 

 tip. 



Length more than one-twentieth of an inch. 



BETHYLUS Latr. 



B. rufipes. — Black; antennas and feet rufous. 



Inhabits North-West Territory. 



Body slender, polished, black; mouth rufous; thorax punc- 

 tured ; 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 ab- 

 domen. 



Inhabits North-west Territory. 



Head with a blackish, transverse line between the antennas; 



