294 R'ErORT OF THE DEPARTMENT OB^ ENTOMOLOGY OF THE 



puparia show as small, oblong, dark-brown, raised spots beneath 

 the epidermis near the base of the asparagus stalk and are often 

 mistaken for the rust pustules. If taken from beneath the 

 epidermis during the fall they are generally amber-brown in 

 color and oblong in shape, with two minute horns or projections 

 at each end. After remaining in thQ stem all winter they are 

 generally very dark brown in color. See Figs. 4 and 5, Plate 

 XLVII. 



LIFE HISTORY. 



The adult flies issued in confinement May 30. They were 

 taken in the field on asparagus June 8. On June 19, puparia and 

 maggots were found beneath the epidermis of this season's 

 growth. No adult flies were to be found. None of the adult 

 flies were tfiken again until August 2. After this date occasional 

 specimens of adult flies and of maggots were noticed until the 

 asparagus was killed by frost. During all the fall the puparia 

 were plentiful and apparently many of the maggots which 

 changed into puparia the latter part of August remained in this 

 condition over winter. 



HABITS AND METHOD OF WORK. 



The adult flies can be found around the flowers, but they were 

 generally found congregated around wounds made by the aspara- 

 gus beetle, apparently feeding upon the juices exuding from these 

 wounds. The place and method of depositing the eggs were 

 not determined, but frequently the mine made by a maggot 

 started beneath a leaf scale and generally near the surface of the 

 ground, thus indicating that the eggs are sometimes deposited 

 under or near the leaf scales. In some instances mines were 

 found which started nearly arfoot above the ground, but generally 

 ithe majority started at or near the surface of the ground and 

 extended downward below the surface of the ground for distances 

 varying from 3 to 4 inches. 



The work of this pest should not be confused with the injury 

 of the European asparagus fly, which mines into the stalk; while 

 the above species simply works beneath the outer bark or epider- 



