INSECT-GALLS OF THE VICINITY OF NEW YORK CITY 25 



wart-shaped, about 1 in. 

 wood {Tilia anicricana). 



in diameter. In numbers on the same leaf of bass- 

 July and August. Rather common. 



51. Tulip-tree Midrib Gall {Cccidomyia titlipijcra Osten Sacken). — A small 

 rounded swelling on the midrib of the leaf of the tulip tree {Liriodendron tidipi- 

 jcrd). Not common. 



52. Tulip-tree Spot Gall (Cccidomyia liriodendri Osten Sacken). — Forms 

 browTi spots with a yellow or greenish areola on the leaves of the tulip tree 

 {Liriodendron tidipijcrd). Common. 



53. "Wild Cherry Bud Gall {Cecidomyia serotina Osten Sacken) . — Rounded, 

 club-shaped, with one or two leaves growing from its sides. Bright red in 



