510 Mr. S. Hirst on the Mite associated with 
Acarapis woodi, Rennie, 1921. 
Tarsonemus woodi, Rennie, Trans. Roy. Soc. Edinburgh, lii. 1921, 
pp. 768-779, 2 text-tigs., 1 pl. 
? .—Body oval, being longer than wide. Segmentation 
not very distinct ; one of the transverse lines is much more 
distinct than the others and divides the body into a cephalo- 
thoracic and an abdominal division. Specimens mounted in 
fluids and examined with a 7), oil-immersion are seen to have 
five weak dorsal tergites, separated from one another by 
transverse lines and also by minute longitudinal striations. 
At the posterior end there is a minute, almost annular pro- 
jection, possibly representing an additional segment. Stig- 
mata minute, but distinct, being paired; one is placed on 
each side of the neck-like elongation of the anterior end of 
the body. 
Venter.—Sternal epimeron Y-shaped. Posterior epimera 
much weaker than those of the anterior pairs of legs. There 
is a minute Y-shaped chitinous structure midway between 
the legs of the third pair. In the middle line between the 
last pair of legs there is a slight projecting lobe divided into 
two by a minute indentation’in the middle. 
Chetotary of Body.—Sixteen hairs are present on the 
dorsum, all of them being long, except the last pair, which 
are shorter. On the cephalothorax (first tergite) there are 
two pairs, one placed behind the other. Second tergite (first 
of abdomen) with four hairs, third with a pair, fourth with 
four, the small posterior tergite with a pair. There is a hair 
on each of the anterior forks of the sternal epimeron, and 
another pair placed in front of the dividing-line between 
cephalothorax and abdomen; also two pairs of shorter 
hairs on the abdomen between the legs. 
Legs.—First leg with only one claw and with a well- 
developed pulvillus, almost circular in shape; second and 
third legs with a pair of strong claws, with a pulvillus in 
between them ; fourth leg much shorter than the others, and 
without either claw or pulvillus, and furnished with long 
hairs. 
Chetotaxy of Legs.—There are a number of hairs on the 
legs, including some very long and fine dorsal hairs. Besides 
these ordinary hairs, there are a number of modified hairs. 
Tarsus of first leg dorsally with a rather large striated 
“olfactory ” hair, which is sharply pointed at the distal end, 
and also another much shorter one laterally. A large 
