300 HYMENOPTERA. 



covered with pale golden jnibescence. Thorax covered with pale 

 golden pubescence, which is very dense on the sides of the meso- 

 and metathorax ; the latter has a central longitudinal channel, 

 and is transversely striated, the apex truncate, the truncation 

 transversely striated, the sides obliquely so ; the wings yellowish 

 hyaline, the nervures and tegulae ferruginous ; the legs and ab- 

 domen ferruginous ; the coxae and trochanters black ; each seg- 

 ment has a large patch of shining silvery silky pubescence on each 

 side; the apical segment covered with silvery pubescence, the 

 margins carinated, the apex sliglitly emarginate. 



Hab. The Gambia. (Coll. F. Smith.) 



17. Tachytes basilicus. 



Lyrops basilicus, Giier. Icon. Regn. Anim. iii. 440. 

 Hab. Senegal. 



Sect. 2. Abdomen black. 



18. Tachytes Natalensis. B.M. 



Tachytes Natalensis, Sauss. Mem. Soc. Phys. Geneve, xiv. fase. 1 . 

 21. 10. t. f. 4 c?. 



Hab. Port Natal. 



19. Tachytes albocinctus. 



Tachytes alhocincta, Lucas, Explo.Sc.Alger.m.250.2l9.t. 14. f. 2. 

 Hab. Algeria. 



20. Tachytes aurifrons. 



Tachytes aurifrons, Lucas, Explo. Sc. Alger, iii. 246. 211. 

 Hab. Algeria. 



21. Tachytes hirsutus. B.M. 



Male. Length 6 hues. — Black: the head and thorax covered 

 with a dense yellow pubescence, which has, in certain lights, a 

 golden lustre ; the face with a rich golden pubescence ; the man- 

 dibles dark rufo-piceous ; the palpi pale testaceous. Thorax : 

 the wings hyaline, the nervures rufo-testaceous ; the legs have a 

 thin pale ])ubescence, and are covered with a pale golden pile; 

 the apical joints of the tarsi ferruginous, the calcaria and claws 

 ferruginous, the spines which arm the tibiae and tarsi pale testa- 

 ceous. Abdomen : the basal segment clothed with pale golden- 

 yellow pubescence ; the apical margins of the first, second and 



