Hymenoptera aculeata collected in Algeria. 549 



branch of the median nervure, metanotum naked, propodeum with 

 only a few short exserted hairs, basal segment of the abdomen with- 

 out long hairs, apical segment with scattered bristly hairs. Legs 

 entirely black, except the posterior femora, which are red, with the 

 exception of the* extreme base and apex, and the posterior tibiae, 

 which are red just below the base. Claws simple. 

 Long. 9-10 m.m. 



$ 2. Biskra, 15 and 16. v. 98. F. D. M. 



POMPILUS NIVEUS, n. sp. 



$ . Niger, pilis niveis densissime vestitus, mandibulis tibiis posticis, 

 tarsisque omnibus testaceis, calcaribus albis, alis subhyalinis apice 

 fusco-maculatis, venis pallidis, cellulis submarginalibus tribus, 

 pronoto angulatim emarginato. 



Black, densely clothed with adpressed snowy-white hair ; head 

 posteriorly, pleurge of thorax and propodeum, especially at the 

 sides, also with scattered erect hairs ; mandibles testaceous, clothed 

 with silvery hairs at the base, labrum fringed with black hairs at 

 the apex, cheeks between the eyes and mandibles about as long 

 as their apical width. Antennas with the 3rd joint considerably 

 longer than the 4th, apices of the joints more or less testaceous, basal 

 joints densely clothed with snowy hairs, pronotum angulately but 

 very obtusely emarginate, wings nearly hyaline but with a very slight 

 brownish tinge, the apices of the front pair narrowly banded with 

 brown, tegulae and nervures pale testaceous ; 3 submarginal cells, 

 the 3rdsubc|uadrate, its outer nervure convexly curved; legs densely 

 clothed with snowy hairs, the knees and tarsi of all the legs 

 and the tibiae of the posterior pair, testaceous. Anterior tarsi 

 with a comb of long flattened black spines on their outer margin, 

 the metatarsal joint bearing 3, the 2nd and 3rd two each, and the 4th 

 one ; on the inner margin the metatarsal joint bears 5 long curved 

 slender spines, the 2nd joint one, the 3rd and 4th each one, but these 

 are thicker and somewhat flattened. Anterior tibiae with a few 

 black spines near the apex, spines of all the other tibiae and tarsi 

 black, calcaria white ; abdomen densely clothed with snowy hairs, 

 extreme apices of the segments slightly testaceous. 



$ 5. Dunes, Biskra, 17 and 18. v. 93. A. E. E. 



Somewhat like a snowy- white plumbeus, but distinguished at once 

 by the pale testaceous wing-nervures, and the hairy propodeum, the 

 flattened spines on the anterior metatarsal comb, and the white 

 calcaria. 



