HYMENOPTERA 129 



of the usual two, the trochanter being itself divided and 

 appearing as two segments. 



2. The flatly compressed abdomen with a longitudinal 

 fold in its walls. 



3. The ovipositor of the female by means of which she 

 deposits her eggs on or in or near the larva of some other 

 insect. 



With a sawfly in hand, note: 



1. The stocky body with abdomen broadly joined to the 

 thorax — not "wasp-waisted." 



2. The long, simple antennae and the ordinary biting 

 mouth-parts. 



3. The wings, more nearly equal and with more numerous 

 veins than in the others. 



4. The saw (ovipositor) of the female. 

 With a sawfly larva in hand, note: 



1. The caterpillar-like form. 



2. The biting jaws and reduced eyes and antennae. 



3. The jointed thoracic legs. 



4. Prolegs underneath the abdominal segments (absent 

 from segment 9). 



5. The spiral curvature of the abdomen. 



