CLASSIFICATION 



319 



agree in having a prothorax much reduced in size and two 

 spines on the shin of each fore-leg ; the female's ovipositor 

 is very well developed, but never projects far beyond the 

 tail-end of the body. The larv^ae are of the caterpillar 

 type with seven or eight pairs of pro-legs besides the six 

 thoracic legs ; most of them feed openly on the leaves of 

 plants (Fig. 76). 



The Siricidae (Giant Sawflies, Horn- tails, or Wood- 

 wasps) have the prothorax less reduced, the shin of each 



Fig. 76. — a, Sawfiy (Emphytus canadenns)^ female, North America; 

 b, caterpillar (side view) ; c, cocoon ; d, pupa (side view), X 4. From 

 F. H. Chittenden (JJ.S. Dept. Agric. Ent. Bull. 27, 1901). 



fore-leg with only one spine, and the hind abdominal 

 segment produced backwards into a spine-like process. 

 This in the female is very long, and the prominent ovipositor 

 extends below it. By means of this ovipositor borings are 

 made in wood and the eggs deposited there. The larvae 

 have very short thoracic legs and no pro-legs. There are 

 less than a hundred species of this family known — a great 

 contrast as compared with the multitude of Tenthredinidae. 

 The Apocrita form that sub-order of Hymenoptera 

 whose members have a marked constriction or waist behind 



