164 



BOARD OF AGRICULTURE. 



scales ; the feet are black, with the base of the femora reddish 

 in the female ; the wings are hyaline, with three spots of a 

 fuscous or dark smoky color on each, one at the base, one in 



Fig. 26. 



the middle, and one at the apex, alternated with two milk 

 white spots on each fore-wing, and three on each hind-wing. 

 It is about 2. in length, and the wings expand 3.50 or more. 



Fig. 27. 



Figure 27 is the male, and figure 28, (//arr.,) the female, of one 

 of our most common species, known as Libi'Uula {Plathemis) 

 trimaculdla of Do Geer, or the three-spotted dragonfly, Tliis 

 name, however, is af)propriate only to the female, as will be 

 seen from the engraving, the male having only two spots on 

 each wing, where the female has three. The upper side of the 



