EXPLANATION OF FIGURE 31. 



61-70 Allograpta obliqua Say. 



61 Egg x 20, from the side. 



62 Dorsal view of egg x 20. 



63 The sculpturing of the egg-shell, highly magnified. 



64 Adult female x 7. 



65 Young larva just hatched, x 50; a, antennae; b, internal esophageal 

 frame-work ; c, the posterior respiratory tubes. 



66 Mature larva x 9; a, antennae; b, position of anterior spiracles; c, 

 posterior respiratory tubes. 



67 Antero-ventral view of head of larva much enlarged ; a, antenna ; b, 

 upper jaw; c, outer pair of mouth-hooks; d, lateral mouth-hooklets; 

 e, internal esophageal framework; f, lower jaw. 



68 End view of posterior respiratory appendage, much enlarged; a, one 

 of the spiracles; b, the circular plate; c, the interspiracular spines. 



69 Dorsal view of puparium x 5 ; a, posterior respiratory appendage. 



70 Lateral view of puparium x 3 ; a, posterior respiratory appendage. 



71-78 Sphaerophoria cylindrica Say. 



71 Adult male from the side x 7. 



72 Dorsal view of posterior respiratory appendage, much enlarged; a, 

 spiracles ; b, circular plate. 



7.? End view of posterior respiratory appendage, much enlarged; a, 

 circular plate; b, one of the three pairs of spiracles. 



74' Anterior larval respiratory cornua with spiracles from the side, 

 highly magnified. 



75 End view of the same. 



76 Mature larva from the side x 6; a, posterior respiratory appendage. 



77 Ventral view of head of larva much enlarged; a, antennae; b, upper 

 jaw; c, lateral mouth-hooklets; d, the outer pair of mouth-hooks; e, 

 esophageal framework; f, lower jaw. 



78 Lateral view of puparium x 7 ; a, the posterior respiratory append- 

 age ; the dotted lines represent other shapes in which the pupal 

 envelope may indurate. 



