lC'HNEUMO^■IN.^ IN THE BRITISH MUSEUM. 169 



broad, basally rounded, emitting fine costulae from its centre; 

 basal area, distinct, spii'acles elongate, apophyses wanting. Scu- 

 tellum dull and somewhat elevated with dark lateral cariuce to 

 near apex. Abdomen cylindrical and dull with base of segments 

 two to five, and centre of the second, black- banded ; basal 

 segment smooth, shining and basally whitish ; thyridii transverse- 

 linear, with the intervening space very narrow ; valvules obsolete. 

 Legs slender with apices of the hind coxfe and of their femora 

 nigrescent, of their tibi?e infuscate ; hind tarsi stramineous 

 throughout. Wings normal and flavescent, with stigma and 

 tegnlre flavous ; areolet as broad as high, subcoalescent above, 

 emitting recurrent from its centre ; basal nervure continuous 

 through median. Length, 10 mm. d only. — The black-banded 

 abdomen and metathorax are distinctive. — One male at Fort 

 Portal Road, Mbarara, in Southern Toro, at 4000 feet, on 22nd 

 October, 1911, in Uganda. 



2. MEDIORUFUS, Sp. n. 



A pale testaceous species with sparse black and white markings ; 

 thorax tricoloured. Head transverse and abi-uptly constricted 

 behind the prominent eyes ; frons smooth with its base, like the 

 elevated ocelli, black : all the oi'bits broadly, mouth and face 

 stramineous, the last deplanate and obsoletely punctate, not 

 discreted from the apically truncate clypeus, which is centrally 

 impressed; lower mandibular tooth and the occipital margin 

 strong and nigrescent; J with centre of frons and whole occiput 

 black. Antenna? setaceous, black and a little incrassate beyond 

 their broadly white-banded centre ; basal joints rufescent beneath. 

 Thoi-ax dull ; mesonotum laterally deep black, which colour is 

 bounded internally by a narrow flavous longitudinal band; 

 elongate callosities before radices clear stiamineous, notauli 

 short a.nd deeply impressed ; metanotum shining and sparsely 

 punctate ; areola coidiform, longer than broad and apically sub- 

 constricted, emitting strong costulse liefore its centre ; petiplar 

 area transaciculate, spiracles elongate, apophyses wanting. 

 Scutellum margined latei'ally to apex and, like the postscutellum, 

 nitidulous and stramineous. Abdomen dull, discally deplanate, 

 of § elongate-fusiform ; the four basal segments closely sculp- 

 tured, with postpetiole and base of the second centrally aciculate ; 

 thyridii triangular, not small and hardly narrower than the 

 intervening space; anus from base of sixth segment, valvulye 

 and the slightly exserted terebra, black ; seventh segment of both 

 sexes discally white ; c? with disc of third and fourth segments 

 black-marked. Legs slender and normal, with the hind tarsi 

 apically nigrescent and their tibiae straight. Wings hyaline, 

 tegulse and stigma testaceous ; areolet as broad as high, coalescent 

 above and emitting recui-rent slightly beyond its centre ; basal 

 nervure continuous. Length, 9-10 mm. S 2 ■ — -The tricoloured 

 mesonotum and anus are remarkable. — The type occurred on 

 14th July, 1910, at Blantyre, in Nyasaland, to Dr. J. E. S. Old,; 



