582 Wisconsin Academy of Sciences , Arts and Letters. 
pens have same scattered white hairs, longer in the female than 
in the male. The male has the coxa, trochanter and femur of the 
first leg, reddish; the remainder of this leg, and all of the second 
and third are light. The fourth leg is reddish. A black line 
is seen on the inner face of the patella and tibia of the first, on 
the femur, patella and tibia in the second and third, and some¬ 
times on the same joints in the fourth. The black line is more 
distinct in some specimens than in others. The male palpus is 
red-brown. In our original example of this species the jet- 
black appearance was due to the rubbing off of the white scales. 
In the female the femur of the first is brown, and the other 
joints of this leg yellow with a black line on the patella and 
tibia. The second and third legs are usually light yellow, 
sometimes with a black line on the femur, and a darkening at 
the distal ends of the joints. The fourth leg is yellow, much 
darkened at the distal ends of the joints, and with a black line 
at the outer side of the femur and tibia. The palpus is white. 
Rufipes is very close to Bettini, but is a Mexican species, 
probably uncommon in the United States, since we have but a 
single example, from San Antonio, Texas. The male may be 
distinguished by the greater slenderness of the legs, especially 
the first, the tibia of the first being five or six times as long as 
wide, while in Bettini it is only about four times as long; and 
by the comparatively dark clypeus, falces, and sides of the ceph- 
alothorax, these parts in Bettini being thickly covered with en¬ 
larged white scales, which cover the sides beyond the second 
row of eyes. In the females the epigynes must be relied 
npon to distinguish the two species. 
The female of rufipes is not Z. strenuus, which was confused 
with it by R.O.P. Cambridge (Biol. Cent. Am. Arachn. Aran., 
XI, p. 291). Mr. Cambridge drew the epigynum of strenuus 
and called it rufipes. He illustrates the male of rufipes by many 
drawings. 
