POMPILID.il. 69 



Rare, Chobham. Chertsey ; (Bi7?(t/Js). Erith ; Darenth ; 

 Harrow ; Deal ; Littleliampton ; {Smith). Glauvilles Woot- 

 ton ; Bouruemouth; Barmouth J Exmouth ; {Dale). 



S. obtusiventris, Schiodte {agilis Shuck). — Closely re- 

 sembles exaltatus in the cj sex and the two prccediug in 

 the ? , the <J , however, may be readily known by the 

 uai'row ventral apical valve, which bears a narrow pilose cen- 

 tral carina; the ? may be known by the shining apex of 

 the clypcus, the less sharply emargiuate pronotum, which 

 has a small shining angular region just above the emargina- 

 tion, which gives the emargiuation the effect of being deeper 

 than it really is ; the longer propodeum which more re- 

 sembles that of cxaUalus and the subcarinate apical ventral 

 valve ; the neuration of the wings resembles that of exaltatus, 

 but the cubital nervure is abbreviated as in notatulus ; tbe 

 legs are coloured as in notatulus, but the impressed line of 

 the face is very short, and extends but a very little way 

 from the insertion of the antennrc. 



L. 7-11 mm. 



Littlehampton. Bury St. Edmunds; (TurJc). Erith; 

 Darenth and Birch Woods, Kent; Harrow ; {Smith). Char- 

 mouth ; Bournemouth ; {Dale). YentnoT ; {Iiothiiey). 



S. pusillus, Schiodte. — Very like oltusivvntris, but 

 easily distinguished in the J" sex by the fimbriated apical 

 ventral valve, which is emarginate at the apex ; the females 

 of the two species are much more difficult to separate, as 

 the femora in pusillus are often reddish; but this species 

 is smaller, the pronotal emargiuation and polished space 

 above it are similar to that of obtusirentris, but the propo- 

 deum is distinctly shorter and more convex dorsally, and 

 the clypeus is less widely shining at the apex, the first 

 abdominal segment also is more declivous at tbe base ; 

 neuration of the wings as in the preceding species and the 

 apical ventral valve subcarinate. 



L. 5-8 mm. 



Chobham, Herno Bay, commonly on Umbelliferce, with 



