1929 ] 
Four New Forms of Eriophyes 
307 
the stature of the mite is larger. Figure 3 illustrates most 
of the distinctive characters which are given in the follow- 
ing description of this variety. 
The mature female is orange-yellow and measures about 
250 microns in length and 70 microns in width, compared 
to 210 microns by 50 microns in the typical species. The 
thoracic shield is very small, triangular, and either smooth 
or traversed by indistinct ridges. The dorsal setse arising 
from large tubercles at the posterior edge of the shield are 
long (c. 40 microns) and slender. The legs are relatively 
short and weak; the feathered claw is five-rayed, the claw 
bristle of the first pair of legs is shorter than that of the 
second but still exceeds the length of the feathered claw. 
The sternal ridge is not forked and does not reach quite to 
the line of the inner corner of the epimeron anterior to 
which the second pair of thoracic setse (c. 20 microns) arise. 
The third pair of thoracic setse are the longest, about 60 
microns, the second pair are the shortest, as usual, and ante- 
rior to the plane of the anterior end of the sternal ridge. 
The rings of the abdomen are relatively narrow, about 80 
in number, with abundant fine tuberculations both dorsally 
and ventrally— the typical form has 60 rings with widely 
separated tubercles. The epigynum is very small, about 16 
microns broad, with an unmarked cover-flap. The lateral 
setse are about as long as the dorsal ones and are approxi- 
mately in the plane of the epigynum. The first pair ventral 
setse are the longest (c. 65 microns) ; the second pair are 
the shortest and most median (c. 30 microns) ; while the 
third pair are relatively coarse and about as long as the 
dorsal setse. This last pair of setse reach over the telson 
which is comparatively small and bears the long flagellate 
caudal setse (c. 120 microns) and accessory setse that are 
coarse and about 7 microns in length. 
This variety of mite was very convenient for carrying 
out experimental infestations to determine the connection 
between the mites and the various abnormalities observed 
in the plants tissues. Experiments were carried on in the 
greenhouse during the winter with plants grown from seeds 
and cuttings. Unaffected plants of Lycium were readily in- 
