550 Mr. R. 1. Pocock on some 
the second leg similar to, but smaller than, that on the first 
leg. Moreover, the fourth leg is shorter than the first. 
Type Lridopelma hirsutum, sp. n. 
Lridopelma hirsutum, sp. un. 
? .—Carapace and limbs clothed with a short coating of 
greyish or yellowish-green hairs, the long sete on the limbs 
also greyish green, no red hairs on the tarsi; the middle of 
the upper surface of the abdomen with a wide dark stripe 
extending from its base to the anus, with a band of long 
yellowish hairs on each side of it, with large ill-defined 
fuscous spots externally to the hairs ; lower surface of abdo- 
men, cox, and sternum black. 
Carapace a little longer than wide, its width distinctly less 
than the patella and tibia of the second leg, which also just 
exceed its length, convex from side to side, the cephalic region 
scarcely at all elevated ; ocular tubercle moderately high, oval, 
wider than long ; anterior median eyes separated by a space 
which is greater than a diameter and greater than the space 
between them and the laterals, which they noticeably exceed 
in size; the two lateral eyes on each side about equal, space 
between them perhaps a little less than their long diameter. 
Legs 1, 4, 2, 3; patella and tibia of fourth less than of 
first, and only a shade greater than of second. 
g.—Much smaller than female. Carapace longer than 
wide, its width distinctly less than patella and tibia of third 
leg and than protarsus of first or fourth, just equal to tibia 
of fourth; length almost equal to protarsus of first, less than 
patella and tibia of third; length from fovea to anterior edge 
a little greater than patella of first, and exceeding half the 
length of the first protarsus. Palpal organ with the filiform 
piece curved through about one-third of a circle, the apex 
flexed slightly outwards. 
Legs long and slender, 1, 4, 2, 38; patella and tibia of fourth 
equal to patella and tibia of second. 
Measurements in millimetres.— ? . ‘Total length 50, carapace 
18, width of latter 17 ; length of first leg 65, of second 66, third 
52, fourth 62°5 ; patella+ tibia of first 20°5, of fourth 19-5. 
$. Total length 27, carapace 11; first leg 55, second 
49, third 40-2, fourth 49; patella+tibia of first 16:3, of 
fourth 14°8. . 
Loc. Brazil (D. Waelson-Barker) ; Pernambuco (type) 
(H. NV. Ridley) ; Iguarassu (G. A. Ramage). 
It appears to me that Mygale detrita of C. Koch (Die 
Avachn. ix. p. 85) may belong to this genus. It is certainly, 
