136 
leaves and most of them had curled up and wer ^ 
yeUow hue. 310 galls were counted on one leaf. Di. burner says 
thousands occur on some lea\es. 
Phytoptus, sp. 
Gives rise to growths of hairs on the leaves of the box elder, 
Nequndo aceroides, Moench. 
Few specimens of this Phytoptus have been seen though the 
growths have been carefully searched lor them. One of those ex 
amined had 45 transverse striae, and was .005 inch long. , 
The sails or cecidii consist of mats of tangled white hairs on the 
under side of the leaves, situated in slight concavities, on the 
nnner side of the leaves the cecidii are seen as correspondingly 
shotit convexities of the surface. The younger leaves and those of, 
s oots a the base of trees are sometimes almost entirely converted 
Kftthep,»li.r h.i,, 
lpovpq Such leaves never expand, but curl up ana seem, uom 
the abundance of the hairs, to be clothed with a fine mealy sub- 
stance. These growths are similar to cecidii of certain oaks. 
The growths are very abundant on box elders planted for shade 
on the streets of Normal, Ill., and have been seen on young tiees 
in the nurseries of the neighborhood. 
Phytoptus fraxini, n. sp. 
Produces galls on the leaves of the green ash, • Fraxinas viridis, 
” ig a very finely striate species, the strise numbering from 78 
to k In one example 70 stri* were counted, but as m others the 
number was so uniformly above 70, a mistake may ha\e been made 
in counting The feather-like appendage has two pairs ot widely 
divergent prongs. An example mounted m glycerine measures 
.048 mm. in length. Eggs and young, occur in June. 
The light-green color of these galls so strongly contrasts with the 
dark leaves that the latter appear at a little distance tci be sp ttd 
w ith light It is a depressed wart-like gall. lhe _ center or iw 
cavity if about in the plane of the leaf, as the projection above and 
liplmv is nearlv equal. The outer surface is variously indented, in 
sot! cases ^asif 6 with the finger nail. The outline Beeni from above 
is elongate circular, or quite irregular. The opening beneath is 
slit surrounded by a raised lip clothed with white hairs. One or 
more folds with many-celled hairs at their tree edges project into 
the interior dividing it into more or less perfect compartments. 
The median’ of these folds is usually largest, and sometimes reaches 
the bottom of the cavity just over the opening. Side folds may i» 
formed from the primary ones. The largest gall measured was .13 
inch in diameter and .13 inch in height, measuring the projection 
on both sides of the leaf. Dr. F. A. W Thomas describes a still 
more peculiar gall from a European Fraxmus This gall « 
abundant in Central Illinois during the summer of 1880 and 1881. 
