1906.] 



The Internal Anatomy of Stomoxys, 



525 



Fig. 1. — Alimentary Canal of Stomoxys. Dorsal view. The thoracic muscles were 

 removed, aud the structures in the thorax separated and spread out, though 

 their relative positions are otherwise maintained. In the abdomen the position 

 of the coils of intestine has been very little disturbed, but the Malpighian 

 tubes have been removed by severing their common ducts on each side near O. 

 P., proventriculus ; T.I., thoracic intestine ; R., rectum ; D.S.G., duct of 

 salivary gland ; S.G., salivary gland ; S.S., sucking stomach ; D.S.S., its duct ; 

 O., point of origin of Malpighian tubes ; H., the dorsal blood vessel cut shoi't 

 at the heart. 



The salivary glands (figs. 1 and 2, S.G.) are partly thoracic and partly 

 abdominal. They are comparatively shorter and thicker than in Glossina. 

 In the abdomen they are ventral to the sucking stomach, and from a dorsal 

 view only a knuckle of gland is exposed at the lower border of this viscus. 



2 Q 2 



