244 



PSYCHE. 



[April 1892. 



puni. An Erineum consisting of large 

 patches of closely matted capitate hairs 

 growing on the under side of the leaf. 

 Patches generally elongated, from a ten- 

 dency of the growths not to cross vein- 

 lets. Well defined, and varying from 

 about 5 mm. to 10 mm. in diameter. 

 When abundant several patches may 

 unite, thus forming more extended ones. 

 Leaves often bear a single patch. Some- 

 times occurring on leaves bearing also 

 the pouch-shaped galls. Color pale 

 yellowish at first, gradually changing to 

 brown with age, at the last deep brown 

 in color. This is probably the same as 

 No. 26 of Dr. H. Hagen's list (Cana- 

 dian entomologist, v. 17, p. 24), col- 

 lected at Shelburne, N. H., by Prof. 

 W. G. Farlow. 



Urbana, 111., not common; Cam- 

 bridge, Mass. and Ithaca, Wis., (from 

 Prof. Wm. Trelease) ; Madison, Wis., 

 (from Prof. A. B. Seymour). 



11. On the leaves of Acer rtibr?im. 

 An Erineum forming elongated whitish 

 or brown patches on the veins of the up- 

 per side of the leaf. This peculiarity of 

 growing on the veins distinguishes this 

 from any growth of the kind I have 

 seen. Several others appear to avoid the 

 veins even when covering most of the 

 surface. The largest growths on leaves 

 before me measure 11 mm. in length by 

 about 4 mm. in diameter. The color va- 

 ries from whitish in the younger growths 

 through shades of pale yellow to brown. 

 The hairs are mushroom-shaped, as in 

 other similar growths. The only ex- 

 amples seen are from Temple, N. H., 

 and were sent me by Prof. Seymour. 



12. On the leaves of Acer rubrum* 

 An Erineum growing in large patches 

 scattered on the under side of the leaf. 

 In color, manner of growth and char- 

 acter of the hairs it appears to be the 

 same as No. 9 described as occurring 

 on Acer dasyccirpum. I have exam- 

 ined a single leaf bearing this deforma- 

 tion received from Prof. Wm. Trelease 

 and collected at Wood's Holl, Mass. 



13. On the leaves of Acer rubrum. 

 This is a gall which does not differ in 

 any important degree from the galls 

 described as growing on the upper sur- 

 face of the leaves of A. dasycarpum. 

 I assume that it is made by the same 

 Phytoptus, but have had no opportunity 

 to make comparisons. It is moderately 

 common in western Kentucky, and ap- 

 pears to be also common in the New 

 England and other Eastern states. I 

 take it that Dr. Hagen's Numbers 21 , 

 22 and 23 (loc. cit.) are the same 

 growth. 



14. On the leaves of Betula papy- 

 rifera. A profusely growing Erineum 

 forming extensive patches between the 

 large veins diverging from the midrib 

 on the under side of the leaf. The 

 growths sometimes occupy the whole 

 of the space between two veins. The 

 color varies from whitish in the younger 

 growths to pale brown in the older ones. 

 The stalks of the capitate hairs are 

 rather long. 



Temple, N. H., (from Prof. A. B. 

 Seymour). 



15. On the leaves of Betula papy- 

 rifera. A small nodular gall which 

 projects from both upper and under sur- 



