190 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
and a little surpassing the distal end of tarsus when joints are flexed, 
the other two spines proximally abruptly thicker than distad, anterior 
spine cognate to base of large spine. Tarsus on mesal side ventrally 
with a series of four slender, distally bristle-like spines; on ectal side 
with a series of about twelve pale slender spines which are very short 
excepting two which are much larger and of about same size as the 
three of mesal side; tarsal claw of about same length as tarsus, (Plate 
5, fig. 3). 
First three pairs of legs with femora, patellae, and tibiae especially 
on ventral surface finely but rather sparsely tubercular, a hair arising 
from each tubercle, distal joints wholly smooth. Fourth legs stout, 
with tarsi abruptly much more slender than the metatarsi; tro- 
chanter with two robust granules on ectal side and at distal end on 
mesal side with a stout thorn; femur granular above, along ventroectal 
edge with a series of mostly stout conical spines which, beginning at 
about one fourth the length from the proximal end as low tubercles 
increase regularly in length distad; along mesoventral surface a series 
of fewer and lower conical tubercles and on the mesal surface with two 
or three irregular series of conical tubercles and spines; patella strongly 
tubercular above and laterally, and with tubercles replaced by stout 
conical spines of which three or four are comparable in length to the 
larger ones of femur; tibia above and laterally strongly tubercular, 
below with tubercles replaced by stouter conical tubercular elevations 
and longer spines like those of the proximal joints; metatarsus above 
and laterally densely granular, below with stouter seriate cones or 
teeth, much smaller and more uniform than the spines of the proximal 
joints. Tarsus I with five joints, three of which are in the distal 
division; tarsus II with eight joints; III and IV with six joints. 
General color dilute ferruginous, the head region weakly dusky; 
caudal border of carapace and the first two tergites of abdomen black; 
patellae and distal ends of femora and tibiae of legs dusky or black, 
the fourth legs a darker, more strictly ferruginous cast than the others. 
Abdomen darker beneath than coxae of legs. 
Length to base of median caudal spine 10.2 mm.; to tip of caudal 
spine 12.3 mm. Greatest width of carapace 6 mm. 
Length of leg I, (exclusive of coxa) cir. 15 mm.; of leg II, 22 mm.; 
of leg III, 7 mm.; of leg IV, 30 mm. 
Locality — Huadquina, 5,000 feet, July. (Type, M. C. Z. 131). 
San Miguel, 6,000 feet, July. (Paratype, M. C. Z. 132, one specimen). 
