212 
Psyche 
[December 
leg 1 30 m, femoral setae 10 m, patellar setae 10 m, thoracic setae 1 
10 m, 21 30m, 111 65m, lateral setae 30 m, dorsal setae 16 m, ventral 
setae 1 35 m, 11 16m, 111 40m, caudal setae 130 m, accessory setae 7 m. 
The gall which Eriophyes produces on Primus maritima 
Wang, is probably the one which Chadwick (1907) lists in his 
catalogue as No. 97 for that plant host and considers it to be the 
same as his No. 100 which occurs on the leaves of Prunus sero- 
tina Ehrh. However, fresh material and sections of the galls 
show them to be quite distinctly different from each other. The 
gall on Prunus maritima is dull red, has a shorter stalk, has a 
rough surface with coarse trichomes, and has a corrugated inner 
wall with trichomes present only in the oriface which opens to 
the under side of the leaf. The gall on the leaves of Prunus sero - 
tince Ehrh. ( Padus virginiana L. Mill.) is green or rose colored, 
smooth surfaced, has a longer stalk, and has on the inner walls 
cellular, trichome-like outgrowths, besides the trichomes which 
fill the oriface. The mites in these latter galls lack the accessory 
setae and may be a subspecies of Eriophyes padi Nal., or a variety 
as Prof. Parrott (quoted by Chadwick 1907) believed them to be. 
