176 THE STUDY OF INSECTS. 



BB. Fore legs not enlarged, and not fitted for grasping, p. 178. 



RAPHIDIID^E. 



AA. Prothorax not as long as the mesothorax and the metathorax 

 combined. 



B. Hind wings broad at the base, and with that part nearest the 

 abdomen (the anal area) folded like a fan when not in use. 



p. 176 SIALID.E. 



BB. Hind wings narrow at base, and not folded like a fan when 

 closed. 



C. Wings with very few veins, and covered with whitish powder. 

 (As this family includes only very rare insects it is not dis- 

 cussed in this book.) CONIOPTERYGID^E. 



CC. Wings with numerous veins, and not covered with powder. 

 D. Antennae gradually enlarged towards the end, or filiform 



with a terminal knob. p. 182 MYRMELEONIDA:. 



DD. Antennae without terminal enlargement. 



E. Some of the transverse veins between the costa and sub- 

 costa forked (in all common forms), wings brownish or 



smoky, p. 181 HEMEROBIID^E. 



EE. Transverse veins between the costa and subcosta simple, 

 wings greenish, p. 180 CHRYSOPID^E. 



Family SlALlD^E (Si-al'i-dae). 

 The Dobsou and others. 



The members of this family differ greatly in size and ap- 

 pearance ; but they agree in having the hind wings wide at 

 the base, and in having that part of these wings nearest the 

 abdomen (the anal area) more or less folded in plaits when 

 the wings are closed. 



The species that is most likely to attract attention is the 

 Horned Corydalis, Corydalis cornnta (Co-ryd'a-lis cor-nu'ta). 

 This is a magnificent insect, which has a wing expanse of 

 from four to nearly five and a half inches. Figure 215 

 represents the male, which has remarkably long mandibles. 

 The female resembles the male, except that the mandibles 

 are comparatively short. 



