210 GRAMMAR OF ENTOMOLOGY. 



the trunks, twigs, leaves, &c. of trees, particularly 

 the oak, and commonly known as " galls," feed- 

 ing on the sap or substance. Pupa changes in 

 the cavity made by the larva. Imago with the 

 antenna; composed of thirteen to fifteen joints, 

 increasing in size exteriorly, but never clavated ; 

 mandibles obtuse ; maxiUs dilated, obtuse, feelers 

 often five-jointed; labium short, with its ligula 

 produced, generally as long as the feelers, entire ; 

 feelers mostly three-jointed; wings with many 

 nervures ; head rather small, somewhat retiring ; 

 mesothorax large and convex ; podeon short, very 

 slender ; body compressed ; decaton in the female 

 very large; ovipositor curved, or spirally con- 

 voluted beneath the body. Beaten out of trees, 

 and off grass, in the summer. Cynips, Figites, 

 Ibalia, Anacharis. 



724. Evaniites (Evaniites). Larva inhabits the 

 larvffi of Sphecina, and occasionally of Blaltina. 

 Pupa changes within the cocoon spun by the larva 

 of the former of these stirpes. Imago with an- 

 tennae thirteen-jointed, of uniform thickness, and 

 very straight; mandibles short, stout, acute, and 

 bifid; maxill* dUated and obtuse, feelers six- 

 jointed; labium, with the ligula very short, quad- 

 rilobed, the lateral lobes very minute, feelers long, 

 often robust, four-jointed; wings with many 

 nervures; podeon slender. Found in summer, 

 flyin" over flowers and about sand-banks, in 

 which the Sfhecina have formed their burrows 



