246 Mr. E. Saunders" Sj/nopsis of BrifisJt 



down the centre, almost to the margm of the clypens ; 

 labrum Lhick. Length 7 — 10 mill. 



Hdh. — Usually on Dnuciis carota, July and August. 

 Woi'thmg ; N. Wales ; Penzance ; Birch Wood ; Erith ; 

 Hawley, Hants ; Isle of Wight ; Yorkshire ; Lowestoft. 



2. raricfidtiis, Fab. Ent. Syst. Suppl. 241, 2, 3. Fig. 

 Smith, Brit. Foss. Hym. pi. ii. fig. 10. 



Differs from the preceding in having the labrum white 

 in both sexes, the prothorax posteriorly wdth only two 

 transverse spots instead of a continuous band, the basal 

 segment and the base of the 2nd segment of the abdomen 

 red ; the 2nd segment also with a pale spot on each side 

 at the apex, and the 6th segment with a large round spot 

 in the middle ; anterior cox?e pale in front ; intermediate 

 and posterior coxae with a jmle spot on the side, near the 

 apex ; legs red ; apex of posterior femora and tibiae dark. 

 Length 6 — 7 lines. 



Hdh. — Devonshire; Parley Copse, Hants; We^^bridge ; 

 Chobham ; verj rare ; July and August. 



Division H. 



Prothorax often consisting of little more than a narrow 

 collar ; its posterior angles lobately produced, but in no 

 case extending to the tegui^ ; female not ai^terous. 



(13) 1. More than one submarginal cell. 



(3) 2. Head and thorax covered with long hairs; ab- 



domen with a Icmg smooth round petiole . . Sphegida 

 (2) 3. Head and thorax rarely covered with long hairs ; 

 abdomen without a long round petiole ; if with 

 a petiole, as in Peviphredon, then with the 

 petiole flattened. 

 (5) 4. Mandibles with a deep incision in their outer 

 margin at some distance from the base, or 

 with the marginal cell appendiculated . . Larridcr. 



(4) 5. Mandibles witli their outer edge single ; marginal 



cell not appendiculated. 

 (7) 6. Two submarginal cells . . . . . . . . Peinphredonidce- 



(0) 7. Three or four submarginal cells. 

 (11) 8. Abdomen not strongly and deeply punctured, 



except occasioually on the basal segment. 

 (lOj 0. Abdomen black, or black and red, with a distinct 



petiole . . . . . . . . . . . . Hlhueniucc. 



(9) 10. Abdomen red and black, not petiolated; or with 

 black and yellow markings; in the latter case 

 sometimes with a petiole . . . . . . Nyssonida. 



