2 74 



ECONOMIC ENTOMOLOGY 



Adult. — Smaller than House-fly; He inich long; greyish, with three 

 blackish, rather broad bands on back of thorax and a dark stripe along 

 back of abdomen; a number of stiff hairs on body and legs; eyes red- 



Fig. 175. — Male of the cabbage root maggot fly. Enlarged about 3 times. 

 (Photo by J. T. Wadsworth. After Gibson and Treherne, Bui. 12, Ent. Br. 

 Dept. Agric. Ottawa.) 



Fig. 176. — Female of the cabbage root maggot fly,. Enlarged about 3 times. 

 (Photo by J. T. Wadsworth.) After Gibson and Treherne, Bui. 12, Ent. Br. 

 Dept. Agric. Ottawa.) 



dish-purple. Hibernates sometimes as adult. Pre-oviposition period 

 about 6 days (Figs. 175 and 176). 



Eggs. — Elliptical, white, ^^5 inch long; 50-60 deposited separately 

 on the surface of ground or on stem of plant; stage lasts about a week. 



