. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 808 ANNALS OF THE SOUTH AFRICAN MUSEUM Since my description of the typical form from Bechuanaland in 1936 I have received a series of 0*6* and $$ from the Transvaal, Portuguese East Africa and Rhodesia which differ from the typical form in having the infuscation in wings slightly less extensive, the basal infuscation leaving slightly more of the apical parts of the anal and axillary cells hyaline and the cross band beyond middle clear area slightly narrower, not quite reaching hind margin of wings an
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 808 ANNALS OF THE SOUTH AFRICAN MUSEUM Since my description of the typical form from Bechuanaland in 1936 I have received a series of 0*6* and $$ from the Transvaal, Portuguese East Africa and Rhodesia which differ from the typical form in having the infuscation in wings slightly less extensive, the basal infuscation leaving slightly more of the apical parts of the anal and axillary cells hyaline and the cross band beyond middle clear area slightly narrower, not quite reaching hind margin of wings and only. Text-fig. 247. Wing of $ Exoprosopa pterosticha Hesse (after Hesse, fig. 3, p. 178, Ann. Transv. Mus., xvii, 1936.) filling middle part of third posterior cell and not its greater part and not extending far into fourth posterior cell. The face too tends to be more exten- sively yellowish, the black on sides and even discally sometimes narrower, and the scaling on legs in some specimens darker. In the Transvaal and South African Museums and the Commonwealth Institute. Length of body: about 8 J-12 mm. Length of wing: about 9-12 J mm. Locality: Bechuanaland, South-West Africa, Southern Rhodesia and Portu- guese East Africa. From hypargyra it differs in having the middle clear indentation in wings much narrower, more oblique and not reaching fourth vein in discoidal cell; the dark cross band also narrower, more oblique, much longer and reaching hind margin or extending into fourth posterior cell; almost uninterrupted, broadish and conspicuous white bands across tergites 3 and 6; white scaling on all sternites; and much longer style. Exoprosopa dzu'-section This and the following heros-section include a series of species which as in the case of some species of Thyridanthrax show a remarkable sexua) dimorphism in which the wings of the <$$ are either markedly differently infuscated, or have a slightly different pattern, from those of the $$. This sexual difference in wing-
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