INSECTS AFFECTING PARK AND WOODLAND TREES 63 1 



is usually indicated on the under surface by a deep impression with a tuft 

 of white hairs in the center [pi. i, fig. iij. ' 



This mite, according to Professor Garman, has from 37 to 42 coarse 

 striae and is about .068 inch in length. The tarsal claw is slightly curved 

 and terminates in an evident knob. The featherlike appendage has four 

 pairs of prongs. It varies in color from pale yellow to light orange. 

 Matured females, young and eggs occur in June. 



Linden wart gall 



Cecidomyia vcrrucicola O. S. 

 This gall [pi. 1, fig. 13] is sometimes exceedingly abundant in mid- 

 summer on linden and quite variable in color, being pale greenish or 

 whitish when young and dark brown or almost black later in the season. 

 It shows about equally on both sides of the foliage. The leaf tissues at the 

 edges of the galls weaken as the season advances, allowing the latter to 

 drop to the ground, so that toward the end of the summer badly infested 

 leaves may be fairly riddled with irregular, circular holes from which the 

 galls have disappeared. 



Linden mite gall 



Eriophyes abnormis Garm. 

 Top-shaped galls about '/ 10 inch in diameter, are sometimes exceedingly abundant on 

 the upper surface of linden leaves. 



This species is more or less common in the vicinity of Albany, and 

 occasionally leaves are very badly affected. The abnormal growth is pro- 

 duced by a small mite which, according to Professor Garman, differs from 

 all Eriophyidae, in that the abdomen, just before the terminal sucker, is 

 noticeably enlarged. He describes the gall as " top-shaped, expanding 

 above and contracting toward the upper surface of the leaves into a neck. 

 It measures .155 of an inch in height and r / I0 inch in diameter. The walls 

 are deeply infolded, sometimes giving rise to unequal lobes. The outer 

 surface is smooth, green and devoid of hairs. The cavity of the gall is 

 made unsymmetrical by the deeper impressions of the wall. The inside 

 of the latter is slightly roughened by small folds and is clothed with long 



