80 DON AT A. 



are used as claspers, while the organs at the base of 

 the abdomen and head of the channel before described 

 are connected with the genitalia. 



The eggs of the dragon-fly are laid on aquatic 

 plants or dropped in the water. The embryological 

 development of Diplax with drawings illustrating dif- 

 ferent stages is given in Packard's Guide to the Study 

 of Insects, 7th ed., pp. 54-59. Larval dragon-flies 

 are abundant in July and August. Fig. 2)^, \, represents 

 one which was collected by a little girl in a slow- 

 running brook on the 23d of August. The terminal 

 portion of the abdomen is raised as it is when the 



Fig. 36. 



insect is breathing, the position being well shown in 

 the drawing. The thoracic rings are more easily 

 made out than in the adult. The prothorax (/^') is 

 large and provided with hairs, and the rings of the 

 abdomen have long hairs in place of the toothed chit- 

 inous ridges. 



The eyes {^ey) and the antennae (^/) are prominent 

 and the mask {mx'^) is well developed. This organ 

 is fully described in the pupal stage because the 

 pupae are larger, and can easily be obtained for class 

 work through the autumn and spring. The legs are 

 hairy and not spiked. The wing-pads {w\ w") are 



