384 P. W. WHITING. 



EXPLANATION OF PLATE I. 



All figures have been drawn with camera lucida. Drawings have been reduced 

 two thirds. Final magnifications are X 32 for Figs. A-H, X 15 for Figs. I-M. 



FIGS. A, B AND C. Ventral view of head, ventral and posterior views of tip 

 of abdomen of deficient male (Freak 60). 



FIGS. D AND E. Ventral and posterior views of abdomen of normal male. 



FIGS. F AND G. Abdominal portion of digestive tracts of deficient female 

 (Freak 21) and deficient male (Freak 20). 



FIG. //. Anterior view of head of deficient male (from 1171.3*:). 



FIGS. I AND J. Ventral and right views of abdomen of deficient female 

 (Freak 6). 



FIGS. K, L AND M. Dorsal, ventral and right views of abdomen of normal 

 female. 



