INSIXTS AFFKCTING I'ARK AND WOODLAND TREES 63I 



is usuall\- indicated on the under surface hy a dec[) inijiression with a tuft 

 of white hairs in the icnter | pi. i, \]<^. i i |. 



This mite, acciinhnu; to Professor darnTan, has from 37 to 42 coarse 

 striae and is ahoul .ooS inch in hiiL^th. Tlu: tarsal claw is sliL,ditly curved 

 and terminates in an evident kiioh. The featherlike a])])enda!4e has four 

 pairs of prongs. It varies in color Irom jtale xellow lO light orange. 

 Maturcil females, young and eggs occur in June. 



Linden wart gall 



CccidoDiyia vcrruticola (). S. 



This gall I pi. I, fig. 13] is sometimes exceedingly al)undant in mid- 



simimer on linden and (juile variabU- in color, being pale greenish or 



whiti-.h when \-oimg and dark brown or almost Ijlack later in the season. 



It shows about e(piall\- on both sides of the foliage. The leaf tissues at the 



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



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



leaves may be fairl\- riddled with irregular, circular holes from which the 



galls have disappeared. 



Linden mite gall 



Eriop/iycs ahnornus (larm. 



■rop-.sli.iped galls about '/,o iiuli in dianiftcr, are sometimes exceedingly abundant on 

 the u|)i)er surface of linden leaves. 



This species is more or less common in the vicinit)' of .\lbany, and 

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

 duct;d by a small mite which, according to Professor (larman, dilhMs from 

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

 noticeably enlarge<l. lb- describes the gall as "top-shaped, ex])anding 

 above and contracting toward the uj^per surface of the leaves into a neck. 

 It measures .155 of an inch in height and ' ,,, inch in diameter. The walls 

 are deeply infolded, sometimes giving rise to unetpial lobes. I he 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 



