544 GEOLOGICAL SURVEY OF THE TERRITORIES. 



EXPLANATION OF PLATE XV. 



Fig. 1. Apus ceqiialis Packard, J enlarged twice, la, upper; Ih, under side of the tel- 



son enlarged. 

 Fig. 2. Lepidurua couesii Packard, nat. size. 2a, side view of the same. 

 Fig. 3. Lepidurus Mloiatus Packard, nat. size. 

 Drawn by J. H. Emerton. 



