British Hymenoptera. 173 



(2) 1. 1st segment of the body without a transverse raised 



line at the base ; antennte in ^ spirally rolled at 



the ajDex . . . . . . . . Subgenus 1. Hoplopus. 



(1) 2. 1st segment of the body with a transverse raised line 

 at the base ; antenna^ in ^ sometimes simple, 

 sometimes reflexed and hooked at the apex. 



(4) 3. Apical joint of the antenna sharply recurved ; 1st 

 segment of the body in both sexes covered with 

 long hairs . . . . . . . . Subgenus 2. AncMrocerus. 



(3) 4. Antennte in the ^ simple ; 1st segment of the body 



without long hairs . . . . . . Subgenus 3. Symmorphus. 



Subgenus I. Hoplopus. 



(2) 1. Abdomen red at the base . . . . . . . . basalts. 



(1) 2. Abdomen not red at the base. 



(4) 3. (J with a long yellow spine on the intermediate coxae ; 



5 with a yellow spot on the clypeus . . . . i-eniformis. 



(3) 4. (J with the coxse simple ; J with clypeus black. 



(6) 5. Femora of ^ simple ; thorax in both sexes truncate 



in front ; its angles prominent . . . . . . Icevipes. 



(5) 6. Intermediate femora of ^ dentate ; thorax not trun- 



cate anteriorly in either sex ; its angles not promi- 

 nent. 



(8) 7. Larger ; markings yellow ; pubescence of head and 



thorax denser and dark . . . . . . . . spinipes. 



(7) 8. Smaller ; markings nearly white ; pubescence of head 



and thorax pale .. .. .. .. nielanoceplialvs. 



1. Odynervs spinipes, Linn. 



Linn., Syst. Nat., ed. x., vol. i., p. 573 ; Smith, Brit. 

 Foss. Hym., &c., p. 203, pi. v., figs, 7, 8. 



<? . Black, with the clypeus, mandibles, antennae in 

 front, a line between them, the prothorax in front, a 

 narrow band at the apex of each abdominal segment 

 except the last, more or less abbreviated on the 3rd, 4th, 

 5th, and 6th, yellow. Legs yellow, with the femora 

 at the base, and the tibiae inwardly, more or less 

 black ; ? similarly coloured, but with the antennae and 

 clypeus entirely black, and the yellow abdominal bands 

 almost entire throughout. 



Head and thorax rugosely punctured, covered with 

 greyish black hairs. Clypeus very deeply emarginate in 

 the <? , slightly so in the ? . Antennae flattened towards 

 the apex, and spirally curved in the ^ , somewhat clavate 

 in the ? ; prothorax slightly rounded in front, its angles 

 right angles, but scarcely prominent. Mesothorax about as 



