318 Report oF THE DEPARTMENT OF ENTOMOLOGY OF THE 
the numbers of the blister mites. As it has apparently not been 
recognized before, it is briefly described as follows: 
Seius pomi n. sp.— Length about four hundred microns and width 
two hundred and ten microns. Body ovoid and yellowish in color; 
dorsum with a number of bristles of varying size. First pair of legs 
are slender, coxa, femur, patella, and tibia are subequal in length, 
trochanter somewhat shorter but of equal width, tarsus is mod- 
erately long. Second, third and fourth pairs of legs are nearly 
equal in length and are stouter than the first pair. On all segments 
there are a number of fine hairs. The epistoma is projecting. The 
palpus is of medium length and is rather stout. The apical segment 
of palpus has on its inner margin near the middle a conspicuous 
bifid spine which is clawlike. The second segment from the apex 
has two stout spines on inner margin and the third segment has at 
least one stout spine on inner margin. All of the segments have a 
number of fine bristles, which are especially abundant on the apex 
of the last seounentan tis. foe) 
EXPERIMENTS IN CONTROLLING THE LEAF BLISTER- 
MITE. 
ORCHARD I: PEARS, 
This orchard is located at Northville. It consists entirely of 
Keiffer pears which are three years of age and of good size. The 
trees have been well cultivated and fertilized and each year cover 
crops have been grown. During the last year the trees grew 
rapidly, and the entire foliage of almost all of the new wood, for 
three or four feet from the tips of the shoots downward, was con- 
spicuously marked by the work of the mites. The remarkable con- 
dition of the trees in this respect indicated an early infestation of 
the trees, which probably commenced with the insertion of the bud 
in the nursery. ) 
Conditions :— The orchard was divided into two portions to make 
comparative tests of fall and spring spraying with the sulphur 
washes for the control of the mite. On December 1, 1904, thirty trees 
were sprayed with the self-boiled lime-sulphur wash, made after 
this formula: Lime 30 pounds, sulphur 15 pounds and caustic 
soda 5 pounds to 50 gallons of water. Twenty-three trees were 
treated with the boiled lime-sulphur wash consisting of lime 20 
