HYMENOPTERA. 249 



callous point of the rib of the superior wings, and which forms a little 

 black spot. They have two closed cubital cells, the first of which 

 alone receives a recurrent nerviu-e. The antennae are not genicu- 

 late, their first joint being slightly elongated, and in the form of a re- 

 versed cone. The mandibles are arcuated and terminated by two or 

 three teeth *. 



There, the mandibles, at least in the females, are strong and bi- 

 dentated on the inner side. The antennae are remote at base. 



Pamphredon, Lat. Fab. — Cemonus, Jur., 

 Where there are two complete sessile cubital cells, and another im- 

 perfect one closed by the posterior edge of the wing. 



One species — the unicolor — feeds its larvoe with Aphides f- 



Mellinus, Fab. Jur., 

 Where there are three complete cubital cells, all sessile, and fre- 

 quently the beginning of a fourth, which does not liowever reach the 

 extremity of the wing ; the first and the third receive, each, a recur- 

 rent nervure. The abdomen is narrowed in the manner of a pedicle 

 \videned at its base. The tarsi are terminated by a large pellet \. In 



Alyson, Jur.' — PoMPiLUS, Fah., 

 We also perceive three complete cubital cells ; but the second is 

 petiolate, and receives the two recurrent nervures. The base of the 

 abdomen is not particularly narrowed. The terminal pellet of the 

 tarsi is small §. 



The remaining Crabronites have their antennte inserted higher or 

 near the middle of the anterior face of the head ; they are usually 

 thickest at the extremity, or even clavate. They all have three 

 complete cubital cells, and two recurrent nervures. 



These Insects are connected by various characters with those of 

 the following family. 



Sometimes the clypeus is almost square. The abdomen is borne 

 on an abruj^t, long pedicle, formed by the first ring. The mandibles 

 terminate by two teeth. 



Psen, Lat. Jur. — Trypoxylon, Pelopceus, Fab. \\ 

 Sometimes the clypeus is as if trilobate. The first ring of the ab- 

 domen is at most narrowed in the manner of a knot. Tlie mandibles 

 terminate in a simple point. The eyes are frequently somewhat 

 emarginated. 



These Insects form the genus 



Philanthus, Fab. 

 The females make their nests in sand, and bury tlie bodies of Bees, 

 Andrenetae. and even Cucurlionites, for the nourishment of their 

 larvae. 



* Lat., Gen. Crust, et Insect., IV, 84. 

 t Lat., Ibid., 83, divis. I. and II. 



I Lat., Ibid., 85. 

 § Lat., Ibid., 86. 



II Lat., Gen. Crust, et Insect., IV, 91. 

 VOL. IV. 



