274 Mr. E. Saunders' Sijno2)sis of British 



width of the 2nd, and all the segments are constricted at 

 the base and apex, the surface is deeply punctured, the 

 apical constriction of each segment shining and im- 

 punctate ; the abdomen in all the species is banded with 

 black and yellow, and the front wings have the 2nd sub- 

 marginal cell petiolated, 



(2) 1. Basal triangle of metathorax smooth and shining ornata. 

 (1) 2. Basal triangle of metathorax striated. 



(4) :]. 2nd or 3rd segment entirel3- pale, without a black 



basal band sahulosa 



(3) 4. All the segments banded. 



(8) 5. Clypeus of (^more or less toothed in front ; clypeus 



of 2 not emarginate. 

 (7) (i. Larger, penultimate segment of abdomen in the (J 



without a pencil of rigid setie at the sides ; 



clypeus of J not raised . . . . . . . . arenaria. 



(0) 1. Smaller, penultimate segment of abdomen in the^ 



with a pencil of rigid setce on each side ; clypeus 



of 5 raised lahiata. 



(5) 8. Clypeus of (^ not toothed; of J emarginate .. 5-fasciata. 



1. armaria, Linn. Syst. Nat. ed. x. vol. i. p. 571. Fig. 

 Smith Brit. Foss. Hym. pi. iv. fig. 8. 



Black, with the following parts yellow, viz., entire face in 

 the (? and scape of the antennae in front ; a spot on the 

 clypeus and one on each side of the face in the 2 and a 

 spot behind each eye ; a spot on each side of the pro- 

 thorax, the tegulae, and the post-scutellum in both sexes, 

 and a spot on each side of the metathorax in the ? ; 

 a band at the apex of each abdominal segment, except 

 the apical one in the 2 , and of each, except the basal 

 and apical ones, in the ^ ; legs in the S' , except the 

 upper side of the femora of the anterior and intermediate 

 pairs, and the apex of the femora of the posterior pair, and 

 a spot at the apex of the posterior tibiae within. Legs in 

 the ? reddish, the two front pairs of femora black at the 

 base, the posterior pair black above ; under side of the <? 

 with a yellow spot on each side of the 3rd and 4th seg- 

 ments of the abdomen; the c? has also sometimes a 

 small round spot on each side of the basal segment 

 of the body above ; apical joint of the antennae reddish, 

 and generally the 2nd and 3rd in both sexes ; wing 

 nervures orange-bro^vn. Head and thorax largely and 

 coarsely punctured, rather densely hairy in the t? , 

 sparingly in the $ ; clypeus in the 3 tridentate, with a 



