CHAMBERLIN: THE ARACHNIDA. pats 
(four fifths) apart, their diameter from the laterals. Lateral eyes on 
each side equal, their radius apart. Anterior row of eyes recurved; 
medians smaller than the laterals (diameters as 4.5: 6), one third their 
diameter apart, closer to the laterals. Clypeus very narrow, about 
one third the diameter of an anterior median eye wide. Area of 
median eyes nearly equal in length and breadth; wider behind than 
in front in ratio 2:3, (Plate 21, fig. 8). 
Sternum widest back of middle, much narrowed cephalad; more 
abruptly narrowed caudad, the caudal angle not very acute; wider 
than long in ratio 15:13, (Plate 21, fig. 6). 
Anterior tibiae flattened dorsoventrally, apparently wholly un- 
spined; anterior metatarsi with a pair of very short spines beneath. 
Posterior tibiae and metatarsi with spines as usual. 
Furrow of posterior spiracle situated at about one third the distance 
from the genital furrow to the spinnerets. 
Length of female, 4.1 mm. Length of cephalothorax, 1.7 mm.; 
width, 1.2 mm. 
Locality.— San Miguel, 6,000 feet, July. (Type, M. C. Z. 262, 
one female not fully mature). 
TTRACHELOPACHYS BICOLOR, sp. nov. 
Plate 21, fig. 9-10. 
Cephalothorax with chelicerae, labium and endites, and the entire 
abdomen solid black or the abdomen above with very vague chevron- 
lines caudad. Spinnerets yellowish. Legs clear yellow, the scopulae 
giving them a dusky appearance at distal ends. 
Posterior row of eyes recurved in such degree that a line tangent 
to caudal edges of medians cuts through the anterior fourth of the 
laterals; median eyes a little smaller than the laterals, twice their 
diameter apart, farther from the laterals. Anterior row of eyes a 
little procurved; laterals much larger than the medians (diameters 
about as 3:2); median eyes their diameter apart, about half as 
far from the laterals. Clypeus twice as wide as diameter of median 
eye. Area of median eyes equal in length to width behind; wider 
behind than in front in ratio 7:6. 
Sternum longer than wide in a little less than the ratio 4:3; strongly 
convex, the borders being much above (dorsad of) level of median 
portion. 
