New Yorx AGRICULTURAL EXPERIMENT STATION. 309 
DESGhIGLIONS ANDIEIBE HISTORY. 
DESCRIPTION OF LIFE STAGES. 
Egg.— The egg is translucent and whitish. It is oval in shape, 
with bluntly rounded ends. The longer axis measures about 46 
microns and the shorter axis is about 35 microns. The eggs are at 
least one week in hatching and the maximum number detected in 
one gall at the same time is fourteen. They may be found in the 
galls of the leaves from April to September. Oviposition also occurs 
in the buds. The eggs are deposited indiscriminately in the galls, 
at the base of the bud scales and in the pubescence of the buds. 
Larva.—Length, 70 microns. The shield is smooth, with indis- 
tinct sculpturing. The striae of the abdomen are visible but are 
not apparent on the outline of the body. The punctuation is fine. 
The external genital parts are wanting. The legs are short and 
stout. The feathered hair has four rays and the claw is longer 
than the feathered hair. The caudal and accessory setae are of 
medium length. The lateral and ventral setae are of medium length 
and proportional to the size of the creature. The anal lobes are 
small. The larva is slightly active and exists in a rather curved 
position buried in the substance of the gall. 
Adult.—The mite is usually white, with some individuals in each 
colony of a pinkish red color. The annulation and fine tubercles, 
which appear as minute punctures, are visible. Viewed dorsally, 
the lateral setae with basal tubercles are very prominent. | 
The body is cylindrical, annulated, gradually tapering to posterior 
segments. The cephalothorax is small and semicircular, sculptur- 
ing consisting principally of three irregular lines in median area, 
running from anterior to posterior margins. ‘The rostrum is large, 
slightly curved and directed downward. The legs are strong and 
of rather even width, segment two being widest. The feathered 
hair is fine and inconspicuous, with four rays. The claw is small 
and slightly swollen at tip. Near distal end and outer margin of 
segment one, there is one long bristle, and a short one is on the 
opposite side. On segments two and four there is one short hair 
on outer margin. The epimera are quadrangular and rather long. 
Three pairs of thoracic setae are present. The third pair are longest 
and are situated in the basal portion of the second pair of epimera. 
The second pair of setae are somewhat shorter and are near 
