60 DRAGONFLIES OF NORTH AMERICA 

Fic. 26. Nymphs. 1, Tachopteryx; 2, Unknown Gomphine from Florida; 
3, Cordulegaster; 4, Ophiogomphus; 5, Gomphus; 6, Gomphoides; 7, Dromo- 
gomphus; 8, Progomphus; 9, Hagenius; 10, Octogomphus; 11, Lanthus. Parts 
of antenna and labium are shown more enlarged; also for 5, variants in form of 
abdomen within the genus. (From Needham’s Guide to the Study of Freshwater 
Biology.) 
