220 H. STEMPFFER 



club oval, flattened, well differentiated, thorax moderately robust, clothed below with long 

 white silky hair ; q* lor e leg. tibia shorter than femur, tarsus unsegmented, finely spinose below. 



Wing shape. Fore wing subtriangular, apex angular, outer margin slightly convex ; hind 

 wing oval, with a short filiform tail at the end of vein 2, anal angle not well marked. 



Wing venation (Text-fig. 329). Fore wing with n veins, n approximate to but not touching 

 vein 12. 



Male genitalia (Text-fig. 192). Uncus composed of two small oval lobes narrowly fused to the 

 posterior margin of the tegumen ; subunci long, slightly curved, tapering gradually to blunt 

 apices, not unguiculate ; tegumen reduced to a narrow median band of which the posterior 

 margin is roundly concave ; the rather wide upper part of the vinculum bent at right angles 

 to the narrow lower portion ; lower fultura composed of two slender curved arms fused together 

 at their base and attached to the base of the valves ; valves suboval ending in a long curved 

 point which bears a small tooth on its inner edge ; penis short, massive in its internal protion ; 

 vesica enclosing a large hook-shaped cornutus (cuneus of Stitz) : the external portion of the 

 penis ends in two long sharp points curved towards the ventral surface (carina penis of 

 Petersen). During the act of copulation the pars inflabilis, accompanied by the cuneus, is 

 unsheathed and passes above (not between) the points of the carina penis ; uncus and distal 

 portions of valves pilose. 



In 1935 {Mission Omo 2 : 219, 240) I published a revision of the African species of 

 Syntarucus, in which I showed that Syntarncus plinius Fabricius, often recorded from 

 Africa by various authors, was in fact an exclusively Indo-Malaysian species, but 

 that, on the other hand there existed in Africa other very common species, which till 

 then had been confused with pirithous, all of which had conspicuously different 

 genitalia. Since then Tite (1958, Entomologist 19 : 189) has isolated three other 

 species. 



The male genitalia of all species resemble those of pirithous, though the subunci 

 and the valves supply excellent specific characters which allow one to determine the 

 species rapidly and accurately, in contrast to their external appearances which are 



Fig. 192. Syntarucus pirithous (Linnaeus), $ genitalia. 



