546 GEOLOGICAL SURVEY OF THE TERKITORIES. 



EXPLANATION OF PLATE XVI. 



Fig. 1. Lepidurus glacialis, enlarged nearly 3 times, la, upper, lb, under side of the 

 telson enlarged. 



Fig. 2. Jpus lucasanns Packard, nat. size. 2a, upper; 26, under side of telson, en- 

 larged. 



Fig, 3. Apus neivberryi Packard, nat. size. 3a, upper; 36 (on right-hand side), under 

 side of telson, enlarged. 



Fio. 4. Apus Jongicaudatus Le Conte, upper, 4a, under side of telson. 



Fig, 5. Apus himalayanus Packard, telson. 5a, under side of telson, enlarged. 

 Drawn by J. H. Emerton. 



