Heteroijyna and Fossorial Hymenoptera. 277 



1. triangidum. Fab. Syst. Ent. 372. Fig. Smith Brit. 

 Foss. Hym. pi. v. fig. 1. 



Head black ; mandibles pitchy brown ; clypeus, sides 

 of the face, and a tricuspid spot above the clypeus, and 

 the head behind the vertex pale yellow; thorax black, 

 with the collar and post-scutellum, and sometimes a spot 

 on the scutellnm, yellow ; abdomen yellow, with a wide 

 triangular band at the base of each segment, except 

 the apical one, black ; legs yellow, base of femora 

 black ; the size of the triangular bands varies much ; 

 in some specimens they are reduced almost to a basal 

 spot, so that the abdomen is almost entirely yellow. 

 Head covered with short hairs, very finely and closely 

 punctured, more coarsely so on the vertex ; thorax hairy, 

 like the head ; mesothorax coarsely punctured, meta- 

 thorax very closely and rugosely so ; brow of the 

 metathorax sometimes smoother and shining ; abdomen 

 deeply punctured, ovate ; basal segment hairy above ; all 

 the segments beneath with a few scattered hairs ; tibiae 

 and tarsi spinose. 



Length 10—15 mill. 



Hah. — Local. Hants ; Sandown Bay ; Pegwell Bay ; 

 Byfleet ; Epping. 



CRABRONID^. 



(2) 1. Neuration of bind wings complete . . . . Trijpoxrjlon. 

 (]) 2. Neuration of hind wings incomplete. 



{(i) 8. Submarginal cell not confluent with the 2nd 



discoidal. 

 (5) 4. Eyes hairy . . . . . . . . . . ■ . Entomognathus. 



(4) 5. Eyes naked . . . . . . . . . . . . Crahro. 



(3) 6. Submarginal and 2nd discoidal cells confluent . . Oxyhelus. 



Trypoxylon, Latr. (PL VIH. fig. 44). 

 Free. Caract. Gen. Lis. p. 121. 

 The very long clavate abdomen is the chief characteristic 

 of this genus ; the neuration of the wings also is different 

 from that of any other genus amongst the Fossorials. 

 The front wings have one distinct submarginal and one 

 distinct discoidal cell, but a second submarginal and a 

 3rd discoidal are indicated by a series of indistinct nerves 

 which at first sight are scarcely noticeable. 



