34O KATHARINE FOOT AND E. C. STROBELL. 



PLATES II AND III (PHOTOS 21-60). 



The photographs of these two plates show typical intromittent organs from 40 

 of the 76 males which we succeeded in rearing from the back-cross with E. ictericus 

 male and the Fi female obtained from a cross with E. varioluriits 9 X E. ictericus cf. 



The photographs of these 40 intromittent organs have been placed on the plates 

 in the order of their size, photo 21 being the shortest (60 mm.) and photo 60 the 

 longest (76.5 mm.). 



None of the 71 specimens which were measured can be classed with the vario- 

 liirlus intromittent organ which varies in length between 85.5 mm. and 106 mm. 

 Ten of the 71, however, can be classed with the ictericus intromittent organ which 

 varies in length between 54.5 mm. and 64.5 mm., though none of the specimens 

 are as short as the shortest iclericus organ (54.5 mm.). The remaining 61 are 

 variable intermediates. 



The length of the intromittent organs of photos 21 to 60 is as follows: Photo 21, 

 60 mm.; Photo 22, 60 mm.; Photo 23, 62 mm.; Photo 24, 62 mm.; Photo 25, 62.5 

 mm.; Photo 26, 63.5 mm.; Photo 27, 64 mm.; Photo 28, 64 mm.; Photo 29, 66 mm.; 

 Photo 30, 66 mm.; Photo 31, 66 mm.; Photo 32, 66.5 mm.; Photo 33, 67 mm.; 

 Photo 34, 68 mm.; Photo 35, 68 mm.; Photo 36, 68 mm.; Photo 37, 68 mm.; Photo 

 38, 69 mm.; Photo 39, 69 mm.; Photo 40, 69 mm.; Photo 41, 69 mm.; Photo 42, 

 70 mm.; Photo 43, 70 mm.; Photo 44, 70 mm.; Photo 45, 70 mm.; Photo 46, 71 

 mm.; Photo 47, 71 mm.; Photo 48, 72 mm.; Photo 49, 72 mm.; Photo 50, 72 mm.; 

 Photo 51, 72 mm.; Photo 52, 72 mm.; Photo 53, 73 mm.; Photo 54, 73.5 mm.; 

 Photo 55, 74 mm.; Photo 56, 74 mm.; Photo 57, 75 mm.; Photo 58, 76 mm.; Photo 

 59, 76 mm.; Photo 60, 76.5 mm. 



