

510 Mr. S. Hirst on (he Mi/e'associated with 



Acarapis woodi, E.ennie, 1921. 



Tarsonemus woodi, Rennie, Trans. Roy. Soc. Edinburgh, lii. 1921, 

 pp. 768-779, 2 text-fia;s., 1 pi. 



? . — Body oval, being longer than wide. Segtnentation 

 not very distinct ; one o£ the transverse lines is much more 

 distinct than the others and divides tiie body into 'a cephalo- 

 thoracic and an abdominal division. Specimens mounted in 

 fluids and examined with a ^^ oii-imiiiersion are seen to have 

 five weak dorsal tergites, separated from one another by 

 transverse lines and also by minute longitudinal stiiations. 

 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 tlie neck-like elongation of the anterior end of 

 the body. 



Venter. ^Sterna] epiraeron 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 tlie third pair. In the middle line between the 

 last pair of legs there is a slight projecting lobe divided into 

 two bj- a minute indentation in tlie middle. 



ChcBtotaxy of Body. — Sixteen hairs are present on the 

 doisuiii, all of them being long, except the last pair, wJiicli 

 are shorter. On the cephalothorax (first tergite) there are 

 two pairs, one placed beiiind the other. Second tergite (fiist 

 of abdomen) with tour liair.*!, third with a pair, fourth witli 

 four, the small posterior tergite with a pair. There is a hair 

 on each of tiie anterior forks of the sternal epimeron, and 

 another pair placed in front of tiie dividing-line between 

 cepiialothorax and abdomen ; also two pairs of sliorter 

 hairs on the abdomen between the legs. 



Z/e^.s.-— First leg witii 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 ; fourtii leg much shorter than the others, and 

 without either claw or pulvillus, and furnished with long 

 hairs. 



Choetotaxy of Legs.^-^\\Gx& are a number of hairs on the 

 legs, iiicluding some very long and fine dorsal hairs. Besides 

 these ordinary hairs, there are a number of modified hairs. 

 Taisus 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 



