124 NEW YORK STATE MUSEUM 



21 An erineum on maple, with capitate trichomes; not further 

 described. The mite is Eriophyes ryderi Banks. 



Ryder '79. Am. Nat. XIII 704, fig. (P h y t o p t u s s p.) 

 Hagen '85, no. 28 



Banks '07. Catalogue of Acarina, p.621 (E. ryderi) 

 As Ryder omits to mention the color or position of the erineum, 

 the kind of maple, or the locality, it would seem that some un- 

 certainty attends the identification of his species. Professor Par- 

 rott is at present working on these forms. 



Key to the forms of Eiiiicuin en Acer 

 A On upper surface of leaf 



a Red or purple, to blackish 



1 Mostly at tips of lobes... No. i on A. glabrum 



2 Scattered between veins . . . No. 16 on A . s a c c h a r u m 



? No. 19 on A. sp. 



? Erineum p u r p u r a s c e n s , no. 

 20 



3 Along veins (see below, no. 7) 

 b White or yellow, to brown 



1 Along veins, elongated. . .No. 6 on A . r u b r u m 



No. 15 on A . s a c c h a r u m 



2 Spreading from veins, pink spotted. . .No. 7 on A . rubrum 

 B On under surface of leaf 



a pimpled Nos. 2 and 3 on A . n e g undo 



b Planate 



1 Trichomes simple, long. . . No. 18 on A . s p i c a t u m 



? E r i n e u m a c e r i n u m of 



Schweinitz on A . r u b r u m , no. 5 



2 Trichomes capitate 



(a) Whitish No. 12 on A . s a c c h a r u m 



? E r i n e u m p 1 a t a n o i d e u m , 

 no. 13 



(b) Yellowish to brown.. No. 4 on A . rubrum 



? E r i n e u m a c c r i n u m , no. 5 

 No. 9 on A . s a c c h a r i n u m 

 No. 14 on A . s a c c h a r u m 

 No. 163 on A . 1 e u c o d e r m e 

 Erineum 1 u t e o 1 u m , auct. 



Pocket-gall (Eriophyes q u a d r i p e s ) . . No. 10 on A . s a c c h a r i - 



n u m 

 No. 8 on A . r u b r u m 

 Pcuch-gall (Eriophyes a c e r i c o 1 a) . . . No. 17 on A . s a c c h a r u m 



No. 1 1 on A . s a c c h a r i - 



n u m 

 No. 164 on A. leucoderme 



