REPORT OF THE STATE ENTOMOLOGIST IQO7 II9 
The forms of the first (and second) type, consisting of fuzzy, 
velvety or frostlike patches of slender, tangled, or capitate hairs 
(trichomes) were formerly described as ee and will be found 
listed in botanical papers such as that of de Schweinitz 1834 in the 
Transactions of the American ee Society, volume 4, page 
289 [see also Professor Peck 1869 in 22d Annual Report of the New 
York State Museum, and Persoon’s Mycologia Europaea, 1822. 
p. 2]. The subgenus Phyllerium was employed by these writers 
for forms with simple trichomes, while Erineum proper or Grumaria 
signified those with capitate or mushroom-shaped trichomes, as 
on right hand side of the figure, type 1. Cecidium is a general term 
for a gall-deformation whether acarian or otherwise. 
Forms occurring in New York State are indicated by an asterisk 
(~) preceding the number in the following catalogue. 
The writer’s thanks should be here expressed to those who have 
given generous assistance and encouragement in t°e preparation of 
this paper, as well as of others yet to be published. He is under 
special obligations to Prof. Nathan Banks of the National Museum, 
ror, Je, J. Parrot Or tae Goneya, lagnermmentt Suen, ID Id, le 
Hela otate dnvtomologist rom ©. lly Peck, State Botanist,, Mr 
D. B. Young, Mr J. R. Gillett, and Mr Stewart H. Burnham, be- 
sides others who have aided with specimens or information. 
) 
Acer glabrum (dwarf maple) 
1 A purple erineum in large patches at tips of the lobes and on 
upper side of the leaf; sometimes sprinkled over under side. 
Trichomes (hairs) woe long stalks. 
CGarmaaneO2 a mON85 Col. 
There are specimens in the State Hea: without locality, 
agreeing with this but bright crimson in color; they are probably 
from Utah. 
| Acer negundo (box elder) 
2 A white erineum or shallow dimple on under side of leaf, some- 
times involving entire leaves of young or basal shoots. 
Garman 783, p.136 (Phytoptus sp.) Il. 
3 Irregular wartlike swellings on upper surface of leaf, green 
to gray, lined below with a green to rusty-brown “ granular secre- 
frome 
Jarvis ’07, p.59, fifth sp. Ont. 
This may be identical with the preceding. 
*See Bibliography at the end. 
