186 H. STEMPFFER 



Male genitalia (Text-fig. 164). Uncus composed of two small lobes fused to either side of the 

 tegumen ; subunci short and robust, bent close to their massive bases ; tegumen a rather wide 

 ribbon ; vinculum continuing as a long robust saccus ; lower fultura shaped like a furca, with 

 straight divergent arms ; valves elongate, oval in their basal halves, tapered and slightly 

 recurved in their distal halves ; penis very robust, the internal portion almost ovoid, the 

 external portion rather short, tapering, dilated at the apex ; uncus and distal portions of the 

 valves sparsely pilose. 



The male genitalia of the other species of Cupidesthes differ in varying degree from 

 those of C. robusta, not in general plan, but in the relative dimensions and shapes of 

 the parts. 



In Cupidesthes arescopa (Text-fig. 165) the subunci are extremely long and slender, 

 the tegumen is reduced to a narrow ribbon in the median area, the valves are digitate 

 and little swollen basally, and the penis is very long, tapering and dilated apically. 



The genitalia of C. voltae, C. thyrsis, C. lithas and C. paralithas are rather like those 

 of C. arescopa, although the subunci are shorter in thyrsis and the valves are not so 

 tapered in the other species. 



Bethune Baker did not examine the genitalia of robusta, but only those of voltae, 

 thyrsis, lithas and arescopa, which explains his statement (I.e. : 5) that " the genitalia 

 are also very different from those of the following genera, the clasps being of a totally 

 different structure as will be seen from the descriptions of these organs ". 



Other species of Cupidesthes present intermediate characters. In C. irumu the 

 valves are digitate, very narrow, the penis slender, but the subunci are only moder- 

 ately long and the posterior margin of the tegumen is deeply excavate. In C. 

 cuprifascia the subunci are very long, the penis slender, but the valves are rather 

 short and moderately wide. In C. leonina the subunci are only of moderate length, 

 the penis less long than in the foregoing species, the valves rather broad with a 

 deeply cleft apex and the upper process ends in a long sharp point. 



Fig. 165. Cupidesthes arescopa arescopa Bethune Baker, <J genitalia. 



