BLUEBERRY INSECTS IN MAINE. 259 



Average length larva 7-75* 4-75 



Minimum length larva 7.00* 4.50 



Maximum length larva 8.50* 5.50 



Average length puparium 4.25 3.35 



Minimum length puparium 4.00 2.80 



Maximum length puparium 5.25 4.00 



The measurements of the adults were made by means of a 

 compound microscope and camera lucida under a magnification 

 of 20 diameters. The larvae and puparia were measured by 

 means of a simple dissecting microscope under a magnification 

 of 12 diameters. The length of the wings was measured along 

 a hypothetical line drawn from the angle formed by the union 

 of R and C at the basal portion to the costal margin of R4+5 

 at the apical. The length of the adult was measured along a 

 hypothetical line from the convergent bristles slightly in front 

 of the ocelli to the tip of the abdomen. Only specimens in 

 which the abdomen was straight and in which the ovipositor was 

 withdrawn into its sheath were used in this last measurement. 

 It will be noted that the largest female bred from the blueberry 

 is but .2, mm. longer than the smallest male bred from the appk. 



METHODS. 



Infested berries were placed under breeding cages on cheese- 

 cloth spread several layers thick over moist dirt, and the full 

 grown larvae as they left the berries and the puparia removed 

 daily. The writer found the most satisfactory way to keep the 

 puparia through the winter was in jelly tumblers on cheese cloth 

 over sand which was moistened approximately once a month. 

 However, in one tumbler which was inadvertently overlooked 

 End not watered between October and April the adults devel- 

 oped normally. The writer experienced no difficulty in carrying 

 his 1913 material through the winter at room temperature but 

 unfortunately all of his 1914 material — not only of Rhagoletis 

 but of other blueberry insects as well — 'become overheated and 

 completely failed to develop. For this reason it has not yet 

 been possible to determine the exact preoviposition of Rhago- 



*From Illingworth, Cornell Exp. Sta. Bui. 324, p. 155. No Maine 

 material measured. 



