INSECT-GALLS OF THE VICINITY OF NEW YORK CITY 



wart-shaped, about A in. 

 wood {Tilia americana). 



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

 July and August. Rather common. 



51. Tulip-tree Midrib Gall (Cccidomyna iiilipifcra Osten Sacken). — A small 

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

 fera). Not common. 



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

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

 {Liriodendron tulipijera). Common. 



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

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



