316 THE CANADIAN ENTOMOLOGIST. 



tufts of hair near its base and also a patch of characteristic spines shown 

 at a. The last segment has a single dorsal tuft with a large bristle below 

 it ; the ventral fan rather long and prominent and four ventral small tufts. 



Length. — When mature, 9 mm. 



T\\Q pupa has cylindrical siphons contracted towards the apex, with 

 small, slightly-oblique, opening ; there is a dense median tuft on the first 

 abdominal segment. The anal fins are large, rounded, with median rib 

 and double-contoured border towards the base of each fin ; a distinct 

 apical dorsal tuft on the last segment. 



Length. — 5 mm., with anal fins 6 mm. 



HESSIAN FLY REARED IN THE LABORATORY. 



BY F. L. WASHBURN, ST. ANTHONY PARK, MINN. 



It has always been claimed that there is but one brood of Hessian 

 Fly in Minnesota. On June 25th of current year larvse of Hessian Fly 

 in second stage were found working on wheat in an adjoining county, 

 brought to the Experiment Station and the wheat plant placed in moist 

 sand in breeding jar in laboratory. These specimens quickly formed 

 puparia, and one fly, a female, emerged July 19th. She lived about two 

 days, before dying depositing between 80 and 90 eggs on green blade of 

 wheat and on dried wheat stem in breeding cage. The eggs were laid 

 indiscriminately on leaf and stem, some singly, some in clusters of two or 

 three and some in strings attached by ends. 



On July ist one larva was found in field in first stage, brought into 

 laboratory on wheat plant, but did not live. 



On the same day larvae in second stage were secured and placed in 

 breeding jar in laboratory. Upon July 8th they formed puparia, and on 

 Aug. 1 6th one female emerged. She died Aug. i8th without ovipositing. 



The season here has been cold and damp, ideal condition for 

 Hessian Fly. Probably more favorable conditions existed outside than 

 in the laboratory. 



