18 Mr. R. E. Turner on 
3. Clypeus very shallowly emarginate at the extreme 
apex, with 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 with dark red gold pubescence; eighth sternite 
very broadly and rather shallowly emarginate, the apical 
angles produced into teeth. Basal joint of the fore tarsus 
with six spines. Second and third abscisse 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. Neave), 
April; East shore of Victoria Nyanza near Karungu 
(S. A. Neave), April. 
Very near 7. separabilis, but differs in the much broader 
seventh tergite and 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 simulatriz, sp. un. 
@. Nigra; scapo apice subtus, mandibulis basi, tegulis, femoribus 
dimidio apicali, tibiis tarsisque ferrugineis; fronte clypeoque 
pallidissime aureo-pubescentibus ; thorace segmentoque mediano 
fulvo-hirsutis ; segmentis dorsalibus 4 basalibus fascia apicali 
argenteo-pubescente ; area pygidiali rufo-setosa; alis flavo- 
hyalinis, venis ferrugineis; galea maxime elongata, scapo triplo 
longiore. 
Long. 16 mm. 
2. Clypeus 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 
