4.2 On Wasps of the Genus Tachytes. 
area more broadly rounded at the apex, but do not seem to 
differ otherwise. I have seen no males from these localities. 
The species is easily distinguished by the slender form and 
the sculpture of the thorax and median segment. 
51. Tachytes silverlocki, sp. nu. 
@. Nigra; fronte, clypeo pronotoque argenteo-pubescentibus ; 
mesonoto lateribus, segmentisque dorsalibus 4 basalibus fascia 
apicali griseo-argenteo-pubescentibus ; segmento mediano lateri- 
bus pleurisque albo-pilosis; tarsis articulis duobus apicalibus, 
articulis secundo tertiogue basi, calcaribusque ferrugineis ; 
pygidio aureo-pubescente ; alis hyalinis, venis fuscis. 
Long. 9-10 mm. 
?. Clypeus very broadly rounded at the apex, the margin 
narrowly depressed; vertex without distinct punctures. 
Eyes separated on the vertex by a distance fully equal to 
the combined length of the two basal joints of the flagellum. 
Median segment more than half as long again as the 
scutellum, without a median sulcus on the dorsal surface, 
except at the extreme apex. Pygidial area subtriangular, 
very narrowly rounded at the apex; second sternite sub- 
opaque, closely microscopically punctured. Basal joint of 
the fore tarsus with five whitish spines. Third abscissa of 
the radius a little longer than the second, the latter a little 
longer than the space between the recurrent nervures on the 
cubitus. Third cubital cell long and narrow, reaching on 
the cubitus much further than the apex of the radial cell. 
Hab. N. Rhodesia, Pakasa (O. Silverlock), January ; 
British E. Africa, Kisumu (S. A. Neave), April. 
This little species is very near the Egyptian 7. camer- 
oniana, Morice, of which only the male is known; but as 
the colour of the tarsi and nervures as well as the details of 
neuration differ, I do not think that it is the female of that 
species. 
*52. Tachytes nigroannulata, Bisch. 
Tachytes nigroannulatus, Bisch. Arch, f. Naturges. A. 3, p. 69 (1913). 
he 
Hab. 8. Rhodesia, Springvale ; December. 
This seems to be allied to J. silverlocki, but 1 do not 
think it can be the male of that species. 
Liris diabolica, Sm. 
Larrada diabolica,Sm. Ann. & Mag. Nat. Hist. (4) xii. p. 294 (1873), 
O¢ 
