SIDUSA. 197 
It is quite possible that Sidusa as here understood will eventually be split up 
into various more or less natural and convenient genera, including those founded 
by Peckham, but it will need vastly more material before anything final can be 
settled. oo 
The species known to me may be distinguished as follows :— 
Males. 
A. Mandibles not excavate in front on the inner margin. 
I. Femur, patella, tibia, and sometimes protarsus and even tarsus of 
legs i., or i. and ii., or 1., ii., iii, more or less distinctly fringed with 
hairs above and beneath, or on the sides. 
A’. Leg i. only ornamented with fringes of hair. 
i. Femur, patella, and tibia only of leg i. ornamented with long erect 
fringes, more noticeable above and below the tibia, which is 
somewhat incrassate. [Tibia of palpus with a tuft of hairs on 
both sides ; spur short and incurved, lying close upon the bulb, 
its apex sharp. Apical spine making a single bold circular 
sweep, but otherwise very similar to that of allied species. 
Carapace orange, clothed with silver and golden-orange hairs, 
with cephalic area black, margined with a band of white hairs, 
and a central and a lateral brown band. Abdomen whitish- 
yellow, with many dorsal mottlings and spots of brown, more 
distinct in the form of dark brown chevrons towards the 
spinners; with a band of silvery hairs on the anterior margin, 
more thinly scattered over the dorsal area; ventral area yellow. 
Base of tibia and base and apex of protarsi iii. and iv. black. 
Femur of leg i. fringed above with black hairs tipped with 
white, patella and tibia fringed above and below, the latter 
black with a tuft of white scales on the inner side towards the 
base. Tibie ii. and iv. with a small dorsal basal spine.] . . cristata, sp. n. 
i. Femur, patella, tibia, protarsus, and tarsus of leg i. ornamented 
with shorter fringes of hair on the sides of the tibia, which is 
not incrassate. [Femur, patella, and tibia of palpus fringed with 
long hairs, but no definite tuft; spur long, sinuous, incurved 
upon the side of the bulb and somewhat clavate at its apex. 
Apical spine making a bold double spiral circular sweep, the 
centre very dilate. Carapace orange, cephalic area and margins 
dark, clothed with silver and golden-grey hairs; clypeus with 
an erect “ mustache ” of white hairs. Abdomen dorsally mottled 
with black streaks, with a black wedge-like spot above the 
anal tubercle; encircled with a marginal pale band, which is 
broken in front. Ventral area pale, with indications of longi- 
tudinal brown bands towards the spinners. Leg i. very dark 
brown, with short fringes of black hairs along the sides, 
