1896.} SPIDERS FROM THE LOWER AMAZONS, 729 
with long pink hairs. Abdomen pale ochre-yellow, almost naked, 
clothed with fine short scattered hairs. Sternwm pale testaceous ; 
labium, cox of legs and pedipalp, and upperside of legs darker ; 
underside of legs paler testaceous. 
Carapace 8 mm. iong; 7 mm. broad; 3 mm. wide at base. 
Cephalic area very prominent and raised above the thoracic area ; 
broad in front, narrowed and compressed behind, with a deep 
impression on either side. Thoracic area bilobate behind, with a 
deep impression on either side towards basal angles. Anterior 
row of eyes slightly procurved ; centrals very small, two diameters 
apart, six from laterals. Lateral anteriors within one transverse 
diameter from margin of clypeus. Anterior row very slightly 
wider than posterior. Central posteriors reniform, their axis 
usually distinctly longer than diameter of posterior laterals ; rather 
over one transverse diameter from the latter. (These proportions 
are variable.) Base of mandibles with a rdteau in front, furnished 
with numerous spicules. Fang-groove armed with 4 stout teeth 
on the outer margin, 6 on the inner, with intermediate cusps 
between the two rows. 
Sternum, including labial plate, 7 mm. long, 4 mm. broad. Five 
pairs of sigilla clearly marked: 1st pair at base of labium, on 
either side; 2nd pair at base of labium behind, coalesced to form 
a deep longitudinal furrow; 3rd, 4th, and 5th longitudinal ; 
central convergent, far remote from margin, coalescing to form 
a deep central depression. Spinners tour, posterior pair three- 
jointed; basal joint longest, terminal very short, tuberculate. 
Labial plate not distinct from rest of sternum ; longer than broad, 
its apex studded with a few minute cuspules. Cowa of pedipalp 
as long as broad; its anterior distal angle produced; anterior basal 
angle and whole of inner margin of disc studded with minute 
cuspules. Patella armed on outside with 2 small distal spines, on 
inner side with 5 or 6 long spines; tibia and tarsus armed on 
both sides with numerous longer and shorter spines. 
Legs. Tarsus and protarsi i. and ii. armed on outer sides with 
numerous spines. Tibia i. with one or two minute spines or 
none on inner side; outer side with afew. Tibia ii. with none 
on inner side; with numerous spinules on outer side. Patella 
and tibia iii. with numerous spines on either side and along the 
anterior margin at apex. Protarsus and tarsus ill. with numerous 
spinules on either side. Patella iv. with numerous spines on 
outer side, and 5 or 6 along apical outer margin; protarsus iv. 
with one or two at apex; tarsus iv. with several on either side. 
Measurements in millimetres—Carapace 8 long, 7 broad. Total 
length, including base of mandibles, 25. Sternum, including labial 
plate, 7 long, 4 broad. Pedipalp 15 long. Legs i. 16, i. 16, 
iii. 16°5, iv. 20 long: all from base of coxa. 
Two specimens (@) were taken from the sand on the campo 
close to Santarem, while digging out a tube of Santaremia pocockt ; 
and a little later a colony of about twenty was found on the same 
campo, nearer the forest. These, all females, had constructed 
Proo. Zoot, Soo.—1896, No. XLVII. 47 
