THE LEPIOOPTERIST 



75 



Figure 2G shows 

 the male and 3G, 

 the female genitalia 

 of Xanthotype cro- 

 cataria. 



The ampullae in 

 some species show 

 good characters, 

 namely the height 

 and breadth and 

 possibly the ar- 

 rangement of 

 spines. The harpe 

 (or clasper, as it 

 has frequently been 

 designated in er- 

 ror) shows good 

 characters in some 

 species, but is vari- 

 able in others. The 

 width, length, and 

 general appearance 

 of the harpe form 

 the best characters. 

 Too great impor- 

 tance should not be 

 placed on the 

 harpe alone with- 

 out a knowledge of 

 its variation for it 

 varies somewhat in 

 the same spcimen. I have not been able to consistently 

 use the serrations of the lower costa, valvae or the 

 shape of the valv?e. There may be differences which 

 can be drawn in a large series, but at present it seems 

 best to use them in combination with other parts. 

 The penis is of primary importance, the shape and 

 character of the spines being the most essential. In 

 the center of the penis is a delicate membraneous, 

 finely-spined tube which is called the ductus cjacula- 

 torius. This can only be made out under high power 



Signum 



Figure OU 



