1896.] SPIDERS FROM THE LOWER AMAZONS. 763 
tumulus low; anterior row of eyes a little procurved (posterior 
margin of laterals aligned with centre of medians); the latter 
circular, half a diameter apart, the same distance from laterals, 
their diameter distinctly less than axis of laterals. Laterals 
ellipsoidal, distinctly separate, anterior a trifle larger than posterior, 
Central posteriors very small, equidistant from central anterior 
and posterior laterals *. 
Sternum a trifle longer than broad; four pairs of sigilla visible— 
1st pair at base of labial plate; 2nd, 3rd, and 4th small, marginal. 
Labium broader than long, not spinulose. Coxa of pedipalp 3 longer 
than broad; anterior distal angle slightly produced and _ blutily 
rounded, not spinulose; basal anterior angle and central. basal 
disk studded with minute cuspules. Leys 4,1, 2,3. Femora 
clothed beneath with long silky hairs; other segments similarly, 
though less thickly. Tibiz, protarsi, and tarsi with a few spines 
beneath, especially iii. and iv. 
Spinners four. Posteriors as long as abdomen, trisegmental ; 
two basal segments subequal, normal; terminal 1 mm. longer 
than both basals taken together, flexuose, caudiform, attenuate at 
apex ; separate at base a distance equal to length of both basals 
taken together. Anterior spinners 2 mm. long, separate at base 
3 longer than one of them. ‘Tarsal claws three, superiors armed 
with 10-11 long denticles, inferior with four or five. Outer 
margin of fang-groove with 10 stout teeth, inner margin with 9; a 
third row of minute cusps close to outer row on inner side at base. 
Measurements in millimetres (largest specimen).— 2. Carap. 
7 long., 55 lat. Abd. 11 long., 8°25 lat. Stern. 3 long., 
25 lat. Coxa of pedipalp 2 long., 1:5 lat. Pedes 4, 1, 2, 3 
—iv. 13 long. Postr. mam. 11 long. Artl. 3—2-75—6-25 long., 
4 separate. Antr. mam. 2 long., 2°5 separate. Mandibles 3 long. 
This species is, without any doubt, one of the most abundant 
spiders on the Lower Amazons. Jt abounds almost everywhere, 
forming its white, sheet-like web, constructed sometimes in tiers, 
one sheet above the other, under the bark of trees, amongst foliage, 
in the hollow centres and amongst the spikes of pine-apple 
plante, and in the crevices aud.crannies of ruined buildings. 
Occasionally, too, they are constructed, like those of our Agelena, 
on the ground. In general character the Spiders bear a strong 
resemblance to this genus as well as to Zewtriv, and the speed 
of their rapid retreat reminds one very much of the latter Spider. 
The web, too, is very similar to that of Tegenaria or Textrix in 
character. Though so abundant, they are not easily secured on 
account of their rapidity, and I was unfortunate in not securing a 
single male. It occurred everywhere from lara to Manaos, along 
the river margin and in the forest on the “ terra firma.” Whether 
it extends far north or south I cannot say, though | should not be 
surprised to find it through the entire valley of the Amazons. 
The species forms an addition to the Museum collection, 
1 These characters must be used with great caution. 
