THE CANADIAN ENTOMOLOGIST 



181 



Explanation of Plate V. 

 Ccenagrion interrogatum (Selys). 



Fig. 1. — Male, dorsal view. Nipigon, Ont. 



Fig. 2. — Male, lateral view. Spruce Brook, Newfoundland. 



Fig. 3. — -Female, dorsal view. Nipigon, Ont. 



Fig. 4. — Female, lateral view. Nipigon, Ont. 



Fig. 5. — Male, abdominal appendages, dorsal view. Spruce 

 Brook, Newfoundland. 



Fig. 6 — Male abdominal appendages lateral view. Spruce 

 Brook, Newfoundland. 



AN INSECT ENEMY OF THE FOUR-LINED LEAF-BUG 

 {PCECILOCAPSUS LINEATUS FABR.) 



BY C. R. CROSBY AND ROBERT MATHESON, ITHACA, N.Y. 



On July 26, 1913, while examining some stems of Weigelia 

 containing the eggs of the four-lined leaf-bug we discovered that 

 the lower end of many of the eggs had been eaten into and the 

 contents extracted by a small hymenopterous larva. The larva 

 burrows through the pith until it reaches a row of eggs and then 



Fig. 14. — Larvae of C. ovisugosus attacking eggs of the Four-lined Leaf-bug. 



proceeds to destroy them one after another until three or four 

 eggs have been eaten (Fig. 14). Frequent y two larvse may attack 

 the same row of eggs working from opposite ends and thus destroy 

 the entire egg mass. From an examination of a large number of 

 egg masses in this clump of Weigelia about 50%. were found to 

 be attacked by this parasite. 



The larvffi reach maturity before cold weather but do not 

 pupate until the following spring. In order to secure adults we 

 collected a large number of egg masses on February 28, 1914, 

 and found the small larva; snugly occupying cavities in the pith 



June, 1915 



