PLATE I. 
Fig. 1. Face of locust, showing distribution of air-sacs; oc, ocular dilated sacs; ct, 
cephalic trachea. 
Fig. 2. Upper side of head of locust ; oc, outer ocular sac ; ioc, inner ocular sac ; cl, 
clypeal trachea. 
Fig. 3. Main ventral air-tuhes of abdomen. 
Fig. 4. Distribution of air-tubes in hind leg. 
