18 Mr. R. E. Turner on 



cJ . Clypens very slialloTvly emarginate at the extreme 

 apex, Avith three small but distinct teeth on each side ; 

 vertex minutely and rather sparsely punctured ; eyes 

 separated on the vertex by a distance equal to the length 

 of the second joint of the flagellum ; median segment more 

 than half as long again as the scutellum, with a distinct 

 longitudinal sulcus on the dorsal surface ; ventral segments 

 of the abdomen finely and evenly, but not very closely 

 punctured ; seventh tergite very broadly truncate at the 

 apex, clothed vritli dark red gold pubescence ; eighth sternite 

 very broadly and rather shallowly emarginate, the a])ical 

 angles produced into teeth. Basal joint of the fore tarsus 

 with six spines. Second and third abscissae of the radius 

 subequal, both rather shorter than the space between the 

 recurrent nervures on the cubitus ; third cubital cell a little 

 shorter on the cubitus than the second. Third joint of 

 labial palpi slender, as long as the second. 



Hab. British East Africa, 30 miles from Magadi Junction 

 (F. G. Hamilton), April; Simba, 3350 ft. (>S'. A. Nenve), 

 April ; East shore of Victoria Nyanza near Karungu 

 {S. A. Neave), xVpril. 



Very near T. separabilis, but differs in the much broader 

 seventh tergite aiul eighth sternite, and in the slightly 

 greater distance between the eyes on the vertex ; . the 

 recurrent nervures are also further apart, and the galea is 

 longer. 



16. Tachytes simulatrix, sp. n. 



$ . Nigra ; scapo apice subtus, mandibulis basi, tegulis, femoribus 

 dimidio apicali, tibiis tarsisque ferrugineis ; fronte clypeoque 

 pallidissime aureo-pubescentibus ; thorace segmentoque raediano 

 fulvo-liirsutis ; segmentis dorsalibus 4 basabbus fascia apicali 

 avgcuteo-pubescente ; area pygidiali rufo-setosa ; alis flavo- 

 hyalinis, venis ferrugineis ; galea maxime elougata, scapo triple 

 Ion gi ore. 



Long. 16 mm. 



$ . Clypens very broadly rounded or subtruncate at the 

 apex; galea very long and narrow, at least three times as 

 long as the scape ; second joint of labial palpi longer than 

 the third. Vertex sparsely and not very finely punctured ; 

 eyes separated on the vertex by a distance slightly exceeding 

 the length of the second joint of the flagellum. Basal joint 

 of the fore tarsus with six spines. Median segment less 

 than half as long again as the scutellum, with a distinct 

 median sulcus; pygidial area broadly triangular, rounded 



