1870.] 



15 



[Packard. 



was distinct, but the inner or visceral membrane, which exists in the 

 Phryganeidse/was not observed. 



Fig. 1. 



Fig. 2. 



md mx 



Tig. 3. 



Fig. 3a. 



Explanation of the Figures. 



Fig. 1, egg with the primitive band lying on the outside of the 

 yolk; a b, fold indicating the meeting of the cephalic and abdominal 

 end of the germ; x, large yolk cells. 



Kg. 2, the primitive band, with the rudiments of the cephalic 

 (1, 2, 3) and thoracic (i, n, in) segments. 



Fig. 3, side, and 3a, front view of the embryo; at, antennas; md, 

 mandibles; mx, maxillse; sp, spring. 



