THE BIOLOGICAL REVIEW. IOO, 



Diptera. 



Eristalis tenax Walk. 

 Gymnosoma occidua Walk. 



Anthrax fascipennis Say. Ocyptera lateralis Harris. 



Syritta pipiens Macq. Tachina (six species). 



Sphaerophoria cylindrica Say. Sarcophaga cadaverina Desv. 



Helophilus similis Macq. Vlusca cassar Linn. 



Eristalis flavipes Walk. Scatophaga stercoraria Linn. 



LIST OF PREY TAKEN BY R. RAPTATORIUS SAY. 



Coleoptera. Hymenoptera. 



Megilla maculata De Geer. Apis mellifica B. Drury. 



Hippodamia 13-punctata Linn. Andrena vicina Smith. 



Coccinella 9-notata H. Philanthus bilunatus Cress. 



Chauliognathus pennsylvanica Dc Thyreopus latipes Smith. 

 Geer. 



CANADIAN GALLS AND THEIR OCCUPANTS. 



By Dr. Wm. Brodie. 



DIPLOSIS MONARDI, N, S. 



The galls appear like swellings on the flowering branches of 

 Monarda fistulosa, from 10 to 22 mm. long, usually a little 

 curved and retaining the quadrangle form of the branch. The 

 average of the side of the square of twenty of the largest was 

 3 mm., and of the branches below the galls 1.5 mm. 



This gall is usually found on plants growing in open woods ; 

 it is very rare on robust plants growing on exposed situations. 



The walls of the gall are hard and woody but thin ; the 

 interior is a soft, pith -like substance, through which the larva 

 tunnels freely, and on which it feeds. I have found but one 

 Diplosis larva to a gall. The larvae are of a pale straw color, 

 and when mature the imagoes escape through a small circular 

 hole at the upper end of the gall. 



A lot of over 100 galls was collected from several localities 

 near Toronto, from April 1 to April 25, 1893. These gave out 

 producers from June 18 to July 6, 1893. From June 4 to 

 June 18, 1893, several specimens of a species of Tory m us 

 emerged, and from June 18 to June 24, 1893, numerous small 

 parasites of two species emerged. 



