HYMENOPTERA. , 301 



third segments with a fascia of silvery pubescence ; the four apical 

 segments wanting. 



Hab. Port Natal. 



22. Tachytes velox. 



Male. Length 6-8^ hnes.— Black : the head and thorax co- 

 vered with thin ochraceous pubescence ; the face densely clothed 

 with pale golden pubescence ; the mandibles rufo-piceovis at their 

 apex ; the i)alpi pale testaceous. Thorax : the wings fulvo-hyaline, 

 the nervures ferruginous, the costal nervure and the tegulae rufo- 

 piceous ; the apical margin of the anterior wings slightly fuscous ; 

 the tibife and tarsi at the base covered outside with pale golden 

 downy pile. Abdomen densely clothed with golden pubescence, 

 which in different lights has a tessellated appearance ; beneath, 

 smooth and shining ; the apical margins of the second and two 

 following segments rufo-piceous, the fifth and sixth margins with 

 bands of golden pubescence. 



Hab. Africa (Gambia, W. Africa). (Coll. F. Smith.) 



This species resem.bles T. monetarius, but it differs in the colour 

 of the mandibles, the pubescence of the face, head and thorax, 

 and also in having the abdomen entirely covered : in T. moneta- 

 rius the base of the abdomen is black and covered with cinereous 

 pubescence ; the wings are also differently coloured. 



23. Tachytes agilis. B.M. 



Male. Length 4 lines. — Black : the face and cheeks with a 

 little silvery pubescence ; the apical joints of the pal])i pale testa- 

 ceous, the basal joints rufo-fuscous. The mesothorax and scu- 

 tellum finely and closely punctured; the metathorax rugose 

 above, obliquely so at the sides ; wings subhyaline, the nervures 

 fusco-ferruginous ; the tibiae, tarsi and apex of the femora bright 

 ferruginous. Abdomen smooth and shining, the margins of the 

 segments with silvery fasciic ; the tip of the abdomen ferruginous. 



Hab. Port Natal. 



Species of Australia and New Zealand. 

 Abdomen black. 



24. Tachytes tachyrrhostus. B.M. 



Tachytes tachyrrhostus, Sauss. Mem. Soc. Phys. Genev. xiv. fasc. 1 . 

 18. 7. t. f. 5 <? . 



Female. Length 6-7 lines. — Black : the face covered with 



