124 ZOOLOGICAL EXERCISES. 
Hind wings much smaller; mouth nearly 
obsolete . r . Lphemerrde. 
B, Antennz moderate, not tapering to the tip. 
Wings not much reticulated . , Termitide, 
Wings densely reticulated . . Myrmeleonidee 
‘C, Antenne long and tapering. 
a. ‘Tarsi two or three-jointed. 
Hind wings not folded . Psocidea. 
Hind wings folded; mandibles rudi- 
mentary ; . Perlidee 
b. Tarsi five-jointed. 
* Hind wings not folded. 
Prothorax much narrower than me- 
sothorax ! . Hemerobude. 
Prothorax nearly as broad as the 
mesothorax . ‘ Sialide. 
** Hind wings folded. 
Wings hairy ; mandibles rudimen- 
tary . Lrehoptera. 
ORDER ORTHOPTERA. 
ANALYSIS OF THE SECTIONS. 
A. Anal segment without a forceps. 
a. Posterior femora not greatly developed. 
Head retracted into prothorax . Cursorea 
Head exserted . Gressorua, 
b, Posterior femora greatly developed . Saltatora. 
B. Anal segment with a movable forceps . Euplexoptera. 
Section CURSORIA. 
A. Tarsi five-jointed, wing covers overlapping — Blattide. 
