258 MAINE AGRICULTURAL EXPERIMENT STATION. I915. 



pupa, page 156; adult, male and female, page 151). The writer 

 has compared his material with these descriptions and finds 

 that larva, puparium, pupa and adult obtained from the blue- 

 berry exactly correspond down to microscopic detail, except 

 that they fall much below the normal size of individuals bred 

 from apples. The writer has also compared pinned specimens 

 of adults bred from apple with individuals bred from blue- 

 berries, under the binocular, but can find no essential differences. 

 The gray thoracic stripes are much lighter in the blueberry 

 flies, even in fresh specimens, and the average difference in size 

 between male and female is greater, but otherwise they are ex- 

 actly like the apple flies except in size. 



Specimens of the flies bred from blueberries were submitted 

 to Mr. C. W. Johnson of the Boston Museum of Natural His- 

 tory, who very kindly determined them as undoubtedly Rhago- 

 letis pomonella Walsh. It is interesting to note in this connec- 

 tion that the adults bred from huckleberries in Connecticut by 

 Doctor Britton which Mr. Johnson showed the writer vv-ere of 

 about the same size as those bred from blueberry, and Professor 

 OT-Cane states in his recent bulletin on the apple maggot that 

 the flies which he bred from blueberries in New Hampshire were 

 under the normal size of this species. 



Below is printed a table showing the comparative size of a 

 series bred from apples in Maine, and of a series bred from 

 blueberries; measurements mere made from 10 males and 10 

 females of each race in the case of the adults, and of 10 larvae 

 and of 10 puparia of each race for the rest. All measurements 

 are expressed in millimeters. 





Apple Maggot 



Blueberry 



Maggo 





$ 



5 



$ 



5 



Average wing 



4.80 



5.20 



3-55 



4-25 



Shortest wing 



4-55 



4-75 



3-25 



4.00 



Longest wing 



5-2S 



5.80 



4.00 



4.60 



Average length adult 



4.60 



5.80 



3.60 



4.20 



Alinimum length adult 



4-25 



5.00 



3.10 



4.10 



Maximum length adult 



5-50 



6.50 



4.00 



4-45 



Average tibia 











mesothoracic leg 



1-55 



1.60 



1. 10 



1.30 



Minimum tibia 



1-45 



1.50 



0.90 



1.20 



Maximum tibia 



1.70 



1.85 



1.30 



1-45 



