INSECT-GALLS OF THE VICINITY OF NEW YORK CITY 29 



62. Willow Club Gall {Cccidomyia rigida Osten Sacken). — Elongated, 

 club-like, tapering to a point at the apex, and with a number of small terminal 

 buds growing from it. Length about f in. On tips of branches of low willow. 

 Rather common. 



63. Willow Potato Gall {Cccidomyia batatas Osten Sacken), — Irregularly 

 rounded, varj-ing considerably in size and in shape. Hard and woody. Some- 

 times the different forms are strung together, one after another, in more or less 

 proximity, on the same twig. On branches of willow {Salix discolor) . Common. 



64. Dogwood Club Gall {Cccidomyia clavula Beuten.). — Club-shaped and 

 about J to I in. long. Inside is an elongated channel inhabited by a single 

 larva. Green in summer and the color of the bark in winter. On terminal 

 twigs of -dogwood {Corniis ftorida). Common. 



