Peckham — Revision) of the Attidce of North America. 411 
the middle of the posterior third is a series of chevrons made of 
white hairs which seem to overlay the red hairs, since when they 
are rubbed away the surface below is uniform red. 
The palpi are of a light brown with short white hairs on the 
upper surface of the femur and patella and long white hairs 
tinged with red on the sides of these joints and all over the tar¬ 
sus. The legs are very striking, being black, with rings of pure 
white scales at the proximal ends of the joints. The inner face 
of the femur of the first is marked by two white bars separated 
by a black band. On the upper surface of this joint are dark 
hairs; on the outer side is a white fringe overhung by dark 
hairs. The patella and the proximal ends of the joints are 
fringed with white, while nearly all of the tibia both above and 
below and the distal ends of the metatarsus and tarsus have 
thick inky black hairs. 
We have this male from the Canadian Rocky Mountains and 
from Mexico, and Mr. Banks has it from Bear, Idaho. Mr. 
Cambridge’s specimens were from Atoyac, in Vera Cruz, Mex¬ 
ico. It seems probable that Phidippus montivagus, which we 
described from a single specimen in 1901, and which comes 
from Mexico, is the female of Tyrrellii, since the marking of 
the cephalothorax is the same. The abdomen has less red and 
is marked by a metallic band. The description of this female 
is as follows : 
$ . Length, 11mm. Legs 4123, first pair stoutest. 
Plate XXXII, figs. 2—2a. 
The cephalothorax has the cephalic part, the middle sides, 
and the posterior thoracic part covered with brown hairs, the 
cephalic plate having also a growth of long light brown hairs, 
which form tufts before and behind the dorsal eyes. Along the 
lower margin of the sides is a white band, and a wider white 
band extends around the front part of the head and upper sides. 
The abdomen is yellowish-red with a white basal band, and a 
dark metallic middle band, not reaching the front end, on which 
are two oblique central spots, and two pairs of bars. These 
