. Bulletin of the British Museum (Natural History) Entom Supp. THYRIDIDAE OF AFRICA AND ITS ISLANDS 65 differences in Striglina are often only single character ones. While these differences are striking considered in relation to species of other genera in Africa, I prefer not to separate new genera from Striglina until species in the other faunae have been studied. Throughout the genus the genitalia of the males are highly modified. The type-species of the genus (S. lineola Guenee) from India has similar genitalia to the clathrata-group from Africa but lacks the fusion of some of the radial ve
. Bulletin of the British Museum (Natural History) Entom Supp. THYRIDIDAE OF AFRICA AND ITS ISLANDS 65 differences in Striglina are often only single character ones. While these differences are striking considered in relation to species of other genera in Africa, I prefer not to separate new genera from Striglina until species in the other faunae have been studied. Throughout the genus the genitalia of the males are highly modified. The type-species of the genus (S. lineola Guenee) from India has similar genitalia to the clathrata-group from Africa but lacks the fusion of some of the radial veins in the fore wing. In the African fauna, for convenience, I make two major divisions of the genus based on the shape of the gnathus in the male. GROUP 1 are the species where the males have a row of peg-like teeth on the gnathus. GROUP 2 are the species where the gnathus is veriously modified but never has peg-like teeth. These divisions may be subgeneric but there are various characters which are found in both groups and a clear division on several characters is not possible at present. Both groups have species with interfacetal hairs on the eyes, with Rs anastomosing with 5c + i?x in the hind wings and with rows of spines on the hind tarsi. The Indo-Australian species so far examined fit into these groups but a more complete picture of this complicated genus will emerge when other faunae are studied. The next divisions into which Group 1 and Group 2 are both divided are the species- groups, which are based on the anastomosing of Sc + R1 and Rs in the hind wing. TABLE 3 Divisions of genus Striglina STRIGLINA Reduced or modified valves. Modified gnathus. Tarsi with spines. Uncus usually modified. Group 1 Peg-like gnathus. Group 2 Gnathus other than Hind wing with Sc+Ri and Rs free Clathrata-group. Hi nd wing with Sc+Rj and Rs anastomosing. Strigif era-group. Hind wing with Sc+Rjand Rs free. Vindicta-group. Hind wing with Sc+Rj and Rs anastomosing. Humeralis-group.
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