610 MISC. PUBLICATION 657, U. S. DEPT. OF AGRICULTURE 
FiGguRE 187.—Spathius canadensis: A, cocoon,; B, female. Greatly enlarged. 
(Courtesy Conn. Agr. Expt. Sta.) 
rated from the entomophagous forms in the following discussion. As 
in the Ichneumonoidea, a few examples of the more important fami- 
hes have been briefly described. Here again, however, each family 
contains a wealth of species showing great diversity of habit, and the 
few examples chosen can by no means satisfactorily represent the 
whole taxonomic group to which they belong. 
