88 Mr. R. I. Pocock on 



ceplialic region liigli and narrow, as in A. antillensis ; eyes of 

 anterior line subequal, snbequally spaeed, the medians barely 

 a diameter apart, posterior medians nearer to the laterals 

 than to the anterior medians, the two laterals separated by a 

 space which is equal to the long diameter of the posterior 

 laterals. 



Legs 4, 1, 2, 3, fourth exceeding first by about one fourth 

 the length of its tarsus, fourth a little more than two and a 

 half times the length of the carapace, third a little more than 

 twice the length. Stridulating-organ consisting of twenty 

 or more rather slender and short plumose bristles, with a few 

 longer spines intermixed on the trochanter of the first leg 

 and about the same number of short plumose bristles on the 

 trochanter of the palp. No other plumose hairs on these 

 appendages. 



Measureme7its in millimetres. — Total length 39 ; length of 

 carapace 19, width IG'S ; length from fovea to anterior 

 border 13 ; length of first leg 47, second 41, third 38, fourth 

 48*3 ; patella and tibia of first 18, of fourth 16 ; protarsus of 

 fourth 14-5. 



Loc. Uruguay. 



Acanthoscurria sterncdis, sp. n. 



$ . — Prevailing colour a tolerably uniform mouse-brown ; 

 abdomen more velvety black above and below, clothed above 

 with long reddish bristles. 



Carapace as long as patella + tibia of first leg, very sliglitly 

 longer than those of fourth, as long as protarsus + ^ tarsus of 

 fourth, slightly longer than tibia + protarsus of second, as 

 long as femur + ^ patella of first and as femur + | patella of 

 fourth. 



Eyes of anterior line subequal, subequally spaced, distance 

 between medians rather less than their diameter; the poste- 

 rior medians nearer to the posterior laterals than to the ante- 

 rior medians ; distance between the two laterals on each side 

 slightly less than long diameter of posterior lateral. 



Legs 4, 1, 2, 3, fourth exceeding first by more than half 

 its tarsus ; fourth nearly three times the length of tlie carapace, 

 first more than two and a half times its length. 



Palp with femur posteriorly without plumose bristles, those 

 on the trochanter stout, curved, plumose, and up to about 

 twenty in number; a iew slender plumose bristles on the 

 adjacent area of the coxa inferiorly. Femur of first leg with 

 thickish plumose scopula in its basal half, the plumose hairs 

 becoming more and more scanty distally ; a small pad of 

 plumose hairs on the diatal third of the coxa in front below 



