1896.] SPIDERS FROM THE LOWER AMAZONS. 725 
with a double series of from 6-7 small cusps, on either side, 
beneath ; tarsus 11. without any spines, but furnished with nume- 
rous spiniform hairs; tarsi i. and iv. without spines, but armed 
with spiniform hairs. Protarsus i. furnished with numerous stout 
cusps beneath; protarsus i. with a few apical and a few other 
Spines on the underside; protarsi ii. and iv. furnished with 
numerous spines. Tibiz i. and ii. armed beneath with numerous 
baciliform spines. Tibi ii. and iv. armed with numerous spines 
beneath. Tarsi i. and ii. three-clawed, superiors with single sub- 
median denticle; tarsi ii. and iv. two-clawed, superiors with single 
submedian denticle, inferior claws obliterated. 
Spinners four: posterior pair less than one-third the length of 
abdomen ; basal joints equal; apical joint double the length of 
basal: anterior pair very short, equal to basal joint, half a diameter 
apart. 
Seen iG furnished on both sides with a row of stiff rufous 
hairs, those on the outer margin coarser. Floor of groove studded 
with a double series of conical teeth, on the inner margin 14, on 
the outer margin 10, the latter being the longest. Tooth no. 9 
on outer margin is inserted opposite tooth no. 14 on the inner 
margin. 
Comparative measurements in millimetres.— 2. Carap. 5:5 long., 
5°5 lat. Abd. 7 long., 5 lat. Ceph. area 4 long. Stern. 2°75 
long., 3 lat. Coxa of pedipalp 2°5 long., 1 lat. Pedes, long. i. 18 
—ii. 14°5—in. 14—iv. 20. Artl. i. 2°6—1—4:5—2—3:5— 32, 
Artl. iv. 2:25—1—5—-2—3-5—4—2. Postr. mam. 2 long. ; artl. 
*5—5—1. Antr. mam. °5 long., 25 separ. Mandib. 2°5 long. 
In both sexes there are present on each of the last three joints 
of all four pairs of legs, on median line of tarsi, at base of protarsi, 
and at base of tibiz on both sides, several small round tubercles, 
from whose summit there issues a single, long, fine ‘‘ sensory hair.” 
The male and female described above were taken together beneath 
a damp decayed log of wood in the low-lying part of the forest 
south of Santarem, on the Lower Amazons. The female was 
partially buried in the soil beneath the log, the whole body being 
apparently bedewed with fine drops of moisture. She remained 
perfectly motionless, and appeared as though dead and in process 
of decomposition through what appeared to be a minute fungus. 
The supposed fungus, however, proved to be only the papilliform 
hairs, each with several drops of moisture on its surface. There 
appeared to be no tube or nest of any kind, and one is led to 
suppose that the hairs are used for perceiving the passage of an 
insect over the spider as it lies buried in the mud. Whether this 
is so or not one cannot, of course, pronounce with certainty; but 
the encrustation of the spider with grains of grit, rendering it 
almost invisible when half buried in the earth, would seem to point 
to some such habit. The male, which was lying with its legs 
gathered together, close to the female, is, however, not se encrusted 
with grit, though the plumose papilliform hairs are very noticeable. 
