April 1S92.J 



PSYCHE. 



245 



faces of the leaf. Clothed with a fine 

 whitish, silken pubescence. Scattered 

 somewhat irregularly, but with a ten- 

 dency to be most abundant near the 

 margin. The diameter of large exam- 

 ples is about 1 mm. ; the depth is some- 

 what less in the dried and pressed 

 examples. It is sometimes associated 

 with the Erineum just described. The 

 color of the upper part of the gall is in 

 the dried specimens dull purple. Be- 

 neath, the color appears to have been 

 like that of the under side of the leaf. 



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

 Seymour) . 



16. On the leaves of Betula populi- 

 folia. This consists of bright, rust- 

 colored growths of deformed hairs in 

 hollows on the under side of the leaf. 

 The corresponding convexity showing 

 on the upper side is devoid of hairs, but 

 is often of a yellowish color. The 

 growths when isolated frequently have 

 a circular outline and are from 2 mm. 

 to 3 mm. in diameter. Large growths 

 become elongated and may measure as 

 much as 10 mm. in length, then occu- 

 pying much of the space between two 

 of the veins which diverge from the 

 midrib. The number of growths on a 

 single leaf varies in seventeen leaves 

 before me from one to fourteen. In 

 three of the seventeen there are imper- 

 fect growths on the upper side of the 

 leaf. The hairs of the growth are capi- 

 tate. 



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

 Seymour). 



17- On the leaves of Betula (lenta?). 

 A profusely growing Erineum at first 



forming straggling patches and lines on 

 and along the veins on the upper sur- 

 face of the leaf. Where abundant 

 eventually forming continuous bands 

 upon the veins which diverge from the 

 midrib. The growths very rarely origi- 

 nate away from the veins on the upper 

 surface, but imperfect growths appear 

 sometimes on the under side, here be- 

 tween the veins, suggesting that it is 

 the structure of the surface, which in- 

 fluences the disposition of the growths. 

 The color of very young growths is 

 whitish ; on older leaves it is brown, 

 while on several of the largest leaves 

 examined there is an indication of purple 

 on some parts of the bands. Hairs capi- 

 tate, stalks rather long. 



Described from specimens sent me 

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

 Seymour. From the character of the 

 leaves and the bark accompanying them 



1 judge the species to be B. loita. 



iS. On the leaves of Juglans cin- 

 ereo. A button-shaped gall on the 

 upper side of the leaf. The galls are 

 green in color, sometimes a trifle lighter 

 in shade than the leaf. They vary from 



2 mm. to 3 mm. in diameter, and are 

 about 2 mm. in height ; the base is 

 sometimes a trifle constricted. Beneath, 

 the galls are open for almost the entire 

 width, but the opening is occupied by 

 a dense growth of whitish or brownish 

 contorted hairs. On fifty-one leaves 

 before me the number of galls on a 

 single leaf varies from one to eighteen. 

 Occasional galls occur with the opening 

 on the upper side. The Phytopti are 

 abundant in examples collected Aug. 1 5. 



