64 
A. —Larvae with 22 legs—(6 pectoral, 14 abdominal and 2 caudal.) 
a. Feeding on leaves of plants (not pine). 
1. Solitary, resting in a spiral manner; ejecting a fluid from 
the pores of the body when disturbed; forming a cocoon. 
2. Solitary or social; not ejecting a fluid from the pores of 
the body; forming or not forming a cocoon. 
aa. Feeding on the leaflets of the pine; social; not ejecting fluids 
from the sides of the body; quiescent, attached by the legs 
to the leaflets; forming a cocoon. 
B. —Larvae with twenty legs (6 pectoral, 12 abdominal and 2 caudal). 
a. Feeding upon leaves of plants (other than pine); resting at 
the edges or upon the surface of the leaves. 
aa. Feeding upon the leaflets of the pine; social; resting at the 
edge of the leaflet; forming a simple cocoon. 
aaa. Living in the galls of plants. 
C. —Larvae with 18 legs (6 pectoral, 10 abdominal and 2 caudal). 
D. —Larvae with only the six, pectoral, legs. 
For the purpose of assisting the reader in determining species, I 
have prepared the following synoptical table, which applies only to 
the larvae of the Saw-flies found injurious in Illinois: 
Synoptical Table of the Saw-fly Larvce. 
I. Larvae with 22 legs (6 thoracic, 14 abdominal and 2 caudal.) 
A. Feeding on the leaves of Coniferae (Pines, 
Firs, Spruces), social. Genus Lophyrus. 
A A. Feeding on the leaves of trees and shrubs other than Coni¬ 
fer a. 
a. Exceeding one inch in length. On the 
Elm, occasionally on Willow. Cimbex laportei. 
aa. Less than one inch in length, not found on the Elm. 
b. Feeding on the leaves of trees: 
1. Hickory. 
2. Linden. 
8. Willow. 
bb. Feeding on the leaves of shrubs: 
1. Cranberry. 
2. Currant and Gooseberry. Pristiphora grossularice. 
8. Raspberry. Selandria rubi. 
4. Rose. Selandria rosce. 
5. Strawberry. Emphytus maculatus. 
II. Larvae with 20 legs (6 thoracic, 12 abdominal and 2 caudal.) 
A. Feeding on leaves; not gall-makers. 
a. Feeding on the leaves of trees: 
Selandria caryce. 
Selandria tilice. 
Dolerus avernsis. 
Pristiphora klentidem. 
1. Butternut. 
2. Cherry (Wild Black) 
8. Cherry and Pear 
4. Willow (chiefly white 
5. Willow (Weeping) 
6. Willow (Salix humulis ) 
7. Willow (Salix alba) 
Selandria juglandis. 
Abia cerasi. 
Selandria cerasi. 
Nematus ventralis. 
Nematus trilineatus. 
Emir a orbit alls. 
Emir a salicicola. 
