142 ILLINOIS BIOLOGICAL MONOGRAPHS (460 



EXPLANATION OF PLATE 

 LARVAE OF TENTHREDINOIDEA 



Fig. 1— Pamphiliidac. Pamphilius sp. Y-125. 



Fig. 2 — Cephidae. Janus integer. 



Fig. 3 — Xiphydrudae. Xiphydria sp. 



Fig. 4 — Siricidae. Tremex columba. 



Fig. 5— Oryssklae. Oryssus occidentalis 



(After Rohwer and Cushman, 1917). 

 au anus 



msp mesothoracic spiracle 

 sba subanal appendage 

 sp* abdominal spiracle 

 srp suranal process 

 tig* mesothoracic leg 

 tsp me ta thoracic spiracle 



