H 1 ’MEA OP TER A . 
6 ii 
is composed of two segments (Fig. 737, b\ while in the 
Stinging Hymenoptera it consists of a single segment. 
There may be exceptions to this characterization among the 
minute members of the Terebrantia ; but the beginning 
student will hardly undertake the study of these. 
Family TENTHREDINID,E (Ten-thre-din'i-dae;. 
The Saw-flies . 
In this family the head and thorax are wide; the base 
of the abdomen is not slender, as in most Hymenoptera, but 
broadly joined to the thorax (Fig. 743, j ); and the abdomen 
Fig. 743-— The Locust saw-fly, Nematus similar is : a , egg ; 5 , voun g larva ; c, full- 
(p-own larva ; a, anal segment of full-grown larva ; e , cocoon ; / adult. (From the 
Author’s Report for 1879.) 
of the female is furnished with a pair of saws. The larvae 
look like caterpillars and feed upon leaves (Fig. 743); but 
they have, ordinarily, from twelve to sixteen prolegs, while 
