519 Mr. 8. Hirst on the Adite associated with 
hairs, with their end blunt, as if broken off, placed dorsally 
near the end of the first tarsus. Fourth leg with five hairs ; 
three of them, of varying length, arise some distance from the 
distal end, the other two are placed at the extreme end of 
the tarsus, one of them being very long and fine, the other 
fairly long. 
Tracheal tubes distributed as shown in fig. 5. 
3 .—Dorsum consisting of only three distinct divisions or 
tergites, the first (cephalothoracie) being large, the second 
(first abdominal) still larger, the posterior one quite small and 
oval in shape. There is also the curious little caudal struc- 
ture present as well in the males of Tarsonemus. 
Chetotaxy of Dorsum.—There are in all twelve hairs on 
the dorsal surface—viz., two pairs on the first tergite, one 
placed behind the other, an anterior row of four and a poste- 
rior pair on the second tergite, and a pair of shorter hairs on 
the small posterior tergite. 
Palp.—Slender, apparently unsegmented, and of small 
size, but fairly elongated ; two minute hairs are present on it. 
Chelicere.—Long and styliform, as in the female aud 
larva. 
Legs.—With the exception of the last one, the legs are 
very like those of the female. Fourth leg somewhat shorter 
than the others, and without claws or pulvillus; it is divided 
into three free segments, the basal one being the stoutest and 
bearing a single hair; the second segment with two ventral 
and one rather long fine dorsal hair; tarsus ending in a 
short blunt spine and a very long fine hair. 
Nymphal Stage.—There is no free nymphal stage, but if 
the larval skin containing a fully developed adult of either 
sex is carefully examined, an inner delicate chitinous membrane 
(without any trace of limbs) enveloping the mite can be 
found, and perhaps it represents the nymphal stage. 
Larval Stage differing considerably in size and general 
appearance according to the degree of development. It is 
elongated and usually egg-shaped or sac-shaped. 
Dorsum with bands of transverse striations alternating 
with plain unstriated areas; the latter are possibly weak 
tergites, and bear very short hairs—one pair on the first 
area, two pairs on the second, one pair on the third, two 
pairs on the fourth; the first (cephalothoracic) tergite appears 
divided in two wlien examined from above, so there is evidence 
of five segments in the larval stage. Posteriorly (ventrally) 
there is a minute oval (anal) plate at the extreme end of the 
body. Laterally there are a number of straight and curved 
