FOSSORES — CR ABKONID^E. 1 2 1 



Pdssalcecus has the hibrum snbtrianguhiv and obtusely pointed ; tlic 

 mandibles large, robust and broader towards apex ; the abdomen has 

 a very short, flattened petiole, and the apical segment 9 '•'? convex 

 above, subcompressed and acute at apex. Two species of small size 

 are known. 



Diodontm has the labrum deeply emarginate, the mandibles long 

 and slender, not broader at apex ; the abdomen is subsessile, with 

 the a])ical dorsal segment 9 rather broad, flattened and triangular. 

 The single species is quite small in size. 



Family CRABRONIDiE. 



This family may be at once distinguished by the neuration of the 

 anterior wings, which have only one submarginal and two discoidal 

 cells (except in Oxybelns, where the submarginal and first discoidal 

 cells are confluent) ; this easily recognized character varies but 

 slightly in the genera, and is diflerent from any other family of this 

 series. The head is generally large, and nearly square when viewed 

 from above, and sometimes broader than the thorax ; the clypeus is 

 short and broad, narrowed to a point at the sides, the eyes large and 

 prominent, and the antenniie inserted close to the base of the clypeus ; 

 the abdomen varies nuich in form, from petiolate to sessile. 



The following table will assist in separating the genera : 



Table of Genera, 



Eyes deeply emarginate within ; ahdinuen lung, clavate : marginal cell long, 

 pointed at apex, not appendiculate ; a second submarginal and a 

 third discoidal cells indistinctly defined; neuration of posterior 



wings complete Trjpox.vlon Latr. 



Eyes not emarginate; marginal cell ol)tuse or truncate at apex, api)en(liculate: 

 neuration of posterior wings incomplete. 

 Sutimarginal cell not confluent with the first discoidal cell ; postscutellum and 

 nietathorax unarmed. 

 Eyes not hairy ; mandibles entire. 



Abdomen distinctly petiolate, the first segment terminating in a node. 



Rliopaliiiii Kirby. 

 Abdomen subpetiolate or sub-sessile, the first segment not tcrmiiiating in a 

 node. 

 Second discoidal cell broadest at apex, shorter than tlie first discoidal 

 cell, which is elongate diamond shaped. 

 Last dorsal segment of abdomen 9 acutely produced, narrowed, com- 

 pressed and grooved towards apex; % anteunfe and antciior tibiffi. 

 not expanded i'rjibro Fabr. 



TK.VNS. .V.MKK. KNT. SOC. (KJ) SUPPL. VOL. 1887. 



