Wasps of the Genus Tachytes, 39 
Hab. Portuguese E. Africa, Valley of Kola River, near 
i, Mt. Chiperone, 1500-2000 ft. (S. A. Neave), April. 
46. Tachytes disputabilis, sp. n. 
¢. Niger; tarsis articulis 4 apicalibus ferrugineis, posticis supra 
infuscatis ; tegulis testaceis; alis hyalinis; venis ferrugineis, 
apice fuscis; fronte clypeoque aureo-pubescentibus ; thorace 
segmentoque mediano sparse aureo-griseo-pubescentibus ; seg- 
mentis dorsalibus 4 basalibus fascia apicali griseo-argenteo- 
pubescente ; segmento dorsali septimo argenteo pubescente ; 
galea lata, scapo breyiore. 
Long., ¢d,11 mm. 
3. Clypeus broadly ,truncate at the apex ; vertex not 
distinctly punctured, opaque ; eyes separated on the vertex 
by a distance about equal to the combined length of the 
first and second joints of the flagellum. Thorax micro- 
scopically punctured ; median segment nearly twice as long 
as the scutellum. Second sternite closely and minutely 
punctured ; seventh tergite broadly rounded at the apex ; 
eighth sternite emarginate, the apical angles produced. 
Basal joint of fore tarsus with four spines ; spur of hind 
tibize shorter than the basal joint of the hind tarsus. Third 
cubital cell nearly as long on the cubitus as the second, 
extending on the cubitus beyond the apex of the radial cell. 
Hab. Nyasaland, S.W. of Lake Chilwa (S. A. Neave), 
January. 
This is near pulchricornis, from which it differs in the 
colour of the antennee and in the much narrower seventh 
tergite and eighth sternite. 
47. Tachytes instabilis, sp. n. 
Very similar to 7. imexorabilis in both sexes, but the 
pubescence on the thorax and median segment is golden 
grey, very short and close lying under sparse, long, erect 
hairs ; the male has the seventh tergite broadly subtruncate 
at the apex, not rounded, and the eighth sternite much 
broader, though also emarginate; the punctures of the 
sternites are distinctly larger. The female differs in the 
sparse and large punctures of the third, fourth, and fifth 
sternites, which are shining, whereas in imezorabilis, except 
at the extreme base, they are opaque and very minutely and 
closely punctured ; the eyes are a little nearer together on 
the vertex, being separated by a distance equal to the length 
of the two basal joints of the flagellum; the wings in both 
