The Currant Fruit Fly. 179 



Doane) or possibly Epochra rubida Coq. if this is a distinct spe- 

 cies. 



North America is divisible into 7 transcontinental belts or 

 life zones, each characterized by particular associations of ani- 

 mals and plants. These zones are : the Artie-Alpine, Hudsonian, 

 Canadian, Transition, Upper Austral, Lower Austral and Tropi- 

 cal. The Transition zone is sub-divided into three faunal areas — 

 an eastern humid or Alleghanian, a western arid and a Pacific 

 coast humid division. The Upper Austral zone is divided into 

 two faunal areas — an eastern humid or Carolinian and a western 

 arid or Upper Sonoran area. The lower Austral and Tropical 

 zones are likewise divisible, but since Epochra canadensis has 

 not been recorded from any locality belonging to these zones, the 

 divisions need not be considered. 



Reliable information on the occurrence of Epochra canaden- 

 sis from specific localities in Canada is exceedingly scarce, and 

 the following discussion on the distribution of this pest is based 

 mainly on doubtful records obtained from infested currants and 

 gooseberries from which the imagoes were not bred. In Canada 

 the currant fruit fly is distributed principally in the Canadian 

 zone. From the data at hand, the northern limit of its distribu- 

 tion seemingly occurs between latitudes 53-54°. The most north- 

 ern locality from which infested fruit has been reported is 

 Edmonton, Alberta, at an elevation of 2,185 feet. The trypetid 

 also occurs in the Alleghanian, western arid and Pacific coast 

 humid areas of the Transition zone. St. Catherines (360 feet), 

 Ontario, situated between Lake Erie and Ontario is located in the 

 Carolinian area of the Upper Austral zone, but the record is 

 based on "a single red currant fruit with a dipterous maggot in 

 it." 



The present known distribution of Epochra canadensis in 

 the United States from reliable records, shows that it occurs in 

 the Canadian, Transition and Upper Austral zones. In table I, 

 an attempt was made to place the various localities into the 

 faunal areas with the use of various maps and descriptions found 

 in North American Fauna. The elevations of the cities were 

 taken from Gannet's (1906, pp. 1-1072) "A Dictionary of Alti- 

 tudes in the United States," except where the entomologist stated 

 the elevation at which the currant fruit fly was collected. 



