PLATE 7 



EXPLANATION OF FIGURES 



Embryology of Photuris pennsylvanica 



31 Egg; yolk bodies represented by polygonal areas. 



32 Section through egg; chorion not represented. B, blastoderm cells; V, 

 vitellophags. The yolk pervades the entire egg. 



33 Egg; divested of chorion; cross section. A, amnion; B, serosa; G, germ- 

 band; Y, yolk. 



34 Embryo of the same age as in figure 33; dorsal view; the broader end 

 is the anterior one; the diamond-shaped area represents the place of union of 

 the amnion and serosa. 



35 Slightly later embryo than figure 34. P, cephalic lobe. 



36 Lateral view of figure 35. A, amnion; P, cephalic lobes; Y, yolk. 



37 Slightly later embryo than figure 35. A, amnion; P, cephalic lobes; Y, 



yolk. 



38 Head of embryo in early segmentation; ventral view. A, amnion; F, 

 antenna; L, lobe of lab rum; P, cephalic lobe. 



39 Embryo in later metamerization than in figure 38. A, amnion; F, an- 

 tenna?; I A, pleuropod or first abdominal appendage; L, lobe of labrum; LG, 

 legs; LI, labium; M, mandibles; MX, maxilla?; P, cephalic lobes; Y, yolk. 



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