34 THE NORTH AMERICAN SPECIES OF DROSOPHILA. 

tal arch. 
EXTERNAL MALE GENITALIA. A, anal plate; C, clasper; G, geni 
Fic. 13.—Drosophila melanogaster. Fig. 15.—Drosophila busckii. 
Fig. 14. Drosophila simulans. Fic. 16.—Drosophila funebris. 
