124 ' NEW YORK STATE MUSEUM 
21 An erineum on maple, with capitate trichomes; not further 
describeds| Lhe mite is) Eire p hives 1 y dict aeainicc: 
Ryder 79. Am. Nat. XIli:7o4, he. (Phytoptus sp.) 
Hagen ’85, no. 28 
Banks ’o7. Catalogue of Acarina, p.621 (EE. 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 Erineum on Acer 
A On upper surface of leaf 
a Red or purple, to blackish 
1 Mostly at tips of lobes...No. 1 on A. glabrum 
2 Scattered between veins...No. 160n A. saccharum 
? No. 19 on A. sp. 
?P Erineum purpurascens, no. 
20 
3 Along veins (see below, no. 7) 
b White or yellow, to brown 
1 Along veins, elongated...No. 6 on A. rubrum 
No. 15 on A: Saccharum 
2 Spreading from veins, pink spotted...No. 7 on A. rubrum 
B On under surface of leaf 
ad Dimpled ew ot ence terse rae Nos. 2 and 3 on A. negundo 
b Planate 
1 Trichomes simple, long...No. 18 on A. spicatum 
? Brineum ac erin Wm of 
Schweinitz on A. rubrum, no.5 
2 Trichomes capitate 
(@)) \WAGSEISIN, 66000800006 INO; 1 on A. SACCMAL UW hn 
2 pane ws platanoideum, 
no. 13 
(b) Yellowish to brown..No. 4 on A. rubrum 
PLPIMNEGMimM ACSTIMMM, MO, 5 
No. 9 on A. saccharinum 
No, 14 ton “AQ staicie hvan ai 
No. 163 on A. leucoderme 
Erineum luteolum, auct. 
Pocket-gall (Eriophyes quadripes)..No. toon A. sacchari- 
num 
No. 8 on A. rubrum 
Pouch-gall (Eriophyes acericola)...No.17onA. saccharum 
IN®, un Ga A, SACCInarilc 
num 
No. 164 on A. leucoderme 
