6 



end, as shown in Fig. 2 (1), and this is a characteristic feature of 

 the species. 



It is in this adult stage that the insect hibernates as a rule, 

 iilthough it may also pass the winter as a puparium close to the 

 roots on which the larva has been feeding. During this hiber- 

 jiating period the adults remain in any convenient place, such as 

 the crevices or concealed corners in outbuildings, or in rubbish out 

 of doors, or under the loose bark of trees or logs, and when the 



F;'gHre 3. 



THiul k'.i;- 1)1' tho male (Hiioii fly (] ) and d the male (•ul)baKe Hy (2) : iiiueh enlarged. Original. 



■wi'aihcr becomes sufficiently warm in the spring they, emerge and. 

 fieek tlie calibage or other cruciferous plants where they may ovi- 

 posit, in 'New Jersey the flies may be found in the field during 

 the lattc-.- part of April or early May, the time of first appearance 

 depending upon the character of the season, and if the plants be 

 carefully watched at that time the insects may be seen resting 

 upon or niiiving about them and on the surface of the ground seek- 

 ing for iil;u-('s to deposit eggs. They are not very active in habit, 



