INSECT-GALLS OF THE VICINITY OF NEW YORK CITY 9 



rounded or somewhat elongated. From about ^ to i in. in diameter. Com- 

 posed of a pithy substance with many rounded cells inside. Greenish, tinged 

 with red. On the stems of the trailing blackberry {Rubiis canadensis) , close to 

 the ground. Not common. 



10. Blackberry SeedGall (Diastrophus ctiscutccformis OstenSacken) . — Consists 

 of small globular, woody, seed-like bodies, pressed closely together, each provided 

 more or less with spines. On stems of blackberry. Not common. 



II. Blackberry Knot Gall {Diastrophus nebidosus Osten Sacken). — Oblong, 

 surface somewhat uneven, with deep longitudinal furrows which divide the gall 

 more or less completely into four or five parts. Length from i to 3 in. and 

 diameter about i to ij in. Dark green, turning reddish as the season ad- 

 vances. Hard, corky, with many oblong cells inside. On stalks of blackberry 

 (Rubus villosHs). Very common. 



12. -Raspberry Root Gall {Diastrophus radicum Bass.). — Irregularly 

 rounded. Varying greatly m size and m shape from that of a pea to bodies 



