SIDUSA. 201 
from the inner side it appears bifid, oming to the base being 
very protuberant.] . . : . » nigropicta, sp. n. 
Bb, Maxille highly developed, dilate, the ‘outer, margin so deeply 
emarginate as to leave the outer apical angle strongly recurved 
and a stout conical tooth about the middle. Sternum twice 
longer than broad. [Patella of palpus dilate behind the middle 
of the inner margin; tibia with a conspicuous concayvo-conical 
spur beneath; femur without any spur beneath. Bulb small 
(as in S. festiva), attenuate, and curved basally, apical spine 
short, stout, spirally curved. Femur of palpus without a tuft 
of white hairs at the apex above.]. . . . . . + + + « masillosa, sp. n. 
B. Mandibles more or less excavate on the inner margin in front. 
Legs 1, 4, 2, 3. 
i. Excavation of mandibles simple, without any cusp-like tooth in the 
middle. 
a. Bulb of palpus much more elongate, either abruptly notched or 
broadly excavate on the inner basal margin. 
a’. Bulb of palpus abruptly notched on the inner basal margin ; 
apical spine shorter, quite slender. Tibia with a single 
slender spur. Legs unicolorous brown. [Carapace and legs 
clothed with azure-blue scales. Clypeus not clothed with 
white hairs. Abdomen with black shoulders, followed by a 
patch of yellow hairs, and, in the apical half, five or six dusky. 
brown chevrons. Excavation of mandibles gradual, not con- . 
fined to the middle of the inner margin.]. . . excavata, sp. n. 
2), Bulb of palpus not abruptly notched, but broadly and deeply 
excavate on the inner basal margin; apical spine broad, flat, 
circular, slightly dilate at the apex. Tibia with two spurs, 
having a small cusp between ;. the upper spur more slender, 
but short, curved, and sharp, the lower stouter, straight, but. 
also short. Legs i. brown, ii., iii., and iv. yellow with black. 
annulations. [Clypeus with a fringe of white hairs; carapace 
brown, with a broad band of white hairs round the cephalic: 
area behind the posterior eyes. Abdomen brown, with an. 
anterior marginal pale band, a transverse continuous post- 
median cincture uniting with another above the spinners, to. 
isolate a large transverse oval brown patch, with two pale 
chevrons on its disc; ventral area with a broad sooty-black 
central band extending from the genital rima almost to the 
spinners.}. . . . . nigriventer, sp.-n: 
b. Bulb of palpus less elongate, not "notched, abruptly constricted or 
excavate on the inner basal margin. [Legs ii., iil., and iv. yellow,. 
annulated with black or brown. Carapace and legs without 
azure-blue scales. Clypeus and base of mandibles clothed with 
BIOL. CENTR.-AMER., Arachn. Aran., Vol. II., January 1901. 2.pp 
