May, '07] 



ENTOMOLOGICAL NEWS. 



combined. The tibiae of the hind pair are nearly twice the length of 

 the femora; the tarsi two and one-half times longer than the tibiae; 

 the first tarsal joint twice as long as the second and third. The legs are 

 sparsely clothed with short hair. The first and second joints of the 

 tarsi are armed with two little spurs on the under side of their apices. 

 Claws, bidentate. Two pairs of venated hyaline wings; the first pair 



Fig. 2. Mandibles and maxillae of O. gravinympha. 



Fig. 3. Portion of posterior 

 tibia showing arrange- 

 ment of epiderm. 



three times as long as wide, and reach to, or extend half way over the 

 first segment of the abdomen. The attachment to the mesothorax 

 extends over nearly the whole width of the wing at its base. It is 

 vested by a heavy aculeate border and veins. The large single vein 

 takes its origin about the middle of the base, then makes a slight 

 turn towards the anal side, then to the costal side, when it bifurcates 

 to form a lozenge-shaped discoidal cell about the middle of the wing. 

 On the anal side it sends off a branch nearly at right angles which ex- 

 tends to the border. On the costal side further towards the apex another 



Fig. 4. Egg of O. gravinympha, much enlarged, on left. Apical 3rd of ist tarsus, on right. 



