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 + R 1 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 peg- like. 



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 



