26 INSECT-GALLS OF THE VICINITY OF NEW YORK CITY 



spring; brown in winter. This gall is an enlargement of the terminal bud of 

 young shoots of the wild cherry (Primus serotina). Common. 



54. Ash Midrib Gall [Cccidomyia pellex Osten Sackcn). — Rounded, oblong 

 or ^-ery much elongated, succulent. Under side indicated by being somewhat 

 swollen. Pale green, sometimes tinged with red. Length from i to 2 in. On 

 midrib of leaf of ash (Fraxinus americana). May and June. Rather common. 



55. Honey-locust Pod Gall iCecidomyia gleditschicu Osten Sacken). — 

 Formed of a single leaflet in such a way as to assume the shape of a small pod. 

 On the leaves of honey-locust {Gleditschia triacanthos). Sometimes nearly 

 all the leaves on the terminal twigs are deformed in this way. Not common. 



56. Hickory Onion Gall {Cecidomyia holotricha Osten Sacken). — Sub- 



