DIPTERA. 



349 



torquens. Both species were found in the nursery. C. marginem- 

 torquens was in great evidence on the leaves of Salix viminalis, but 

 no terminal buds were infested. On the other hand, the terminal 

 buds as represented in the figure were infested on the species of 

 willow known locally as the Wentworth seedling golden willow, and 

 some of the leaves were rolled as in Salix viminalis (fig. 322), but 

 not to any appreciable extent. 



The male is about 5 to 6 mm. in expanse of wings. Colour 

 blackish on back, and grey on belly side. Eyes black. Antenna? 



Fig. 322. Leading shoots of a s})ceics of willow injured by Cecidomyia heterobia. 



darkish-brown. Palpi lightish -grey. Thorax clothed with greyish 

 hairs. At base of wings a yellowish -orange. Wings hyaline, and 

 clothed with greyish hairs. Veins dark -grey. Legs lightish -grey. 

 Abdomen uniform dark-grey. Gentalia dark-brown. 



Cecidomyia (Rhabdophaga) salicis, Schrk. 

 (Willow-twig Midge). 



The gall which is formed by this insect is found on various 

 species of willow throughout the latter part of the summer and 

 winter. The gall is formed by the gregarious larvae feeding upon 



