544 Mr. Edward Saunders on 



joint of the latter densely clothed with golden silvery hairs. The 

 2nd joint of the flagellum is only slightly longer than the 3rd, 

 whereas in gracilis the 2nd joint is much longer ; prothorax angu- 

 lately emarginate posteriorly ; anterior metatarsi with 3 spines 

 as in gracilis, but these are much shorter and only about half as long 

 as the joint which bears them, while in gracilis they are quite two- 

 thirds as long. The wings are coloured much as in that species, but 

 the 2nd submarginal is much wider, trapeziform, its upper margin 

 about half as long as the lower, and its outer nervure meeting the 

 nervure of the radial cell near the centre of the latter, and not near 

 the base. Claws angularly dilated laterally at the base, with a stiff 

 bristle extending from near the base of the angulation almost to the 

 apex of the claw. This at first sight gives the claw almost the 

 appearance of being bifid. 

 Long. 9 m.m. 



$ 2. Biskra, 12 and 20. v. 98. F. D. M. 



POMPILUS (ApOTUS) VACHALI, n. sp. 



Capite et thorace nigris, argenteo sericeo-micantibus antennis 

 gracilibus, pronoto fortiter declivi postice semicirculariter emargin- 

 ato, in medio ipso angulato : mesonoto valde convexo, alis lacteo- 

 hyalinis fascia lata prope apicem nigro-fusca ornatis, cellula cubitali 

 secunda postice radiali longitudine sequali, metatarsis anticis 

 spinulis tribus longis armatis, abdomine rufo, subargenteo micante, 

 segmentis tribus apicalibus nigris. 



Head and thorax black, clothed with a brilliant silvery pile, head 

 small, very flat and transverse, scarcely produced beyond the eyes either 

 in front or behind ; clypeus slightly raised along its apical margin, 

 mandibles testaceous at the base ; antennas slender with the 3rd joint 

 very long, a third longer than the 4th ; basal joint clothed with 

 silvery pile ; pronotum very declivous, rather long, much narrowed 

 in front, its posterior margin semicircularly emarginate with a slight 

 angular incision in the centre of the emargination. Mesonotum 

 wide and gibbous, the post-scutellum from a lateral point of view 

 almost perpendicular, and the propodeum extending backwards from 

 a much lower level than the scutellum. The propodeum and coxa? 

 are especially brilliant in their silvery clothing. Wings clear 

 hyaline with a milky or almost frosted tint in certain lights ; second 

 submarginal cell about three times as wide along its lower margin as 

 along its upper, the lower margin about equalling the radial cell in 

 length. A broad black-brown band crosses the apex of the wing, 

 the actual apex being rather clearer; a cloud also covers the extreme 

 apex of the hind wing. Legs black, anterior metatarsus as long as the 



