402 
MR. A. H. MICHAEL ON 
hairs instead of one pair, as in M. musculinus. These hairs are 
nearly as long as the whole length of the body ; both pairs curve 
upwards at first, and then run backward and outward ; but the 
pair near the centre are much the straigbter. There are two 
other much smaller hairs springing from each of the square pro- 
jections. There are two large hairs on each side of the body, one 
a little in front of, and one a little behind, the constriction between 
cephalothorax and abdomen ; the hinder is considerably the larger. 
There is a pair of large hairs on the dorsum of the cephalothorax, 
and several smaller pairs on that of the abdomen. The claws of 
the first two pairs of legs are extremely long, very slightly curved, 
and rod-like. The legs of the fourth pair, although of the same 
general form as in M. musculinus, are very much smaller in pro- 
portion, they do not project behind the body, and are scarcely 
thicker than those of the first and second pairs ; they are much 
shorter and narrower than those of the third pair, which extend 
considerably further back than the body. Each tarsus of the 
fourth pair bears a long flexible hair and a short stout spike still 
nearer to the tip. On the inside of the flattened claw of each 
third leg, at the proximal end of the claw, is a curved chitiuous 
process projecting inward, and a similar process is found on the 
preceding joint. There are several pairs of long hairs on the 
ventral surface, and a pair of stout spines behind the penis. 
The Female . — The female differs from M. musculinus more 
than the male does. The abdomen of the present species is almost 
cylindrical, although somewhat flattened dorso-ventrally ; it is 
slightly smaller at the ends than in the middle, but is without 
the highly flattened form and the lateral angular projections found 
in the other species. The whole abdomen is covered by strong, 
slightly irregular transverse wrinkles or ridges ; these are slightly 
rough, but are not set with the well-marked and regular points 
found on those of the female of M. musculinus. The length of 
the abdomen varies greatly in different specimens, or more pro- 
bably in the same specimens at different times : there is usually 
one egg matured at a time, and as it is very long, it probably 
elongates the extensile abdomen as it grows, and other circum- 
stances will probably produce temporary variations in the length 
of the abdomen. The variation in the length of the female noticed 
in the measurements arises almost entirely from the abdomen. 
The creature usually holds the hair of the mouse with the third 
and fourth claws, and keeps the rostrum sharply inclined down- 
