THORELL ON ARANE.E OF COLORADO. 515 



band covered with grayish hair, and ( 9 ) with a row of pale supramar. 

 ginal spots on each side ; legs black, with pale brownish rings ; back of 

 abdomen black along the sides, with a pale brown lanceolate band in 

 front, mottled with grayish-white along the middle, and with two rows 

 of grayish-white points toward the sides; tarsal joint of the black- 

 haired palpi in ^ not broader than the anterior thighs, somewhat longer 

 than the two preceding joints together; genital bulb very high at the 

 base, and there provided with a very short and coarse tooth and an out- 

 •ward-directed spine concealed in a fovea, as also toward the outer side 

 with a strong downward-directed spine ; vulva forming a large decan- 

 ter-shaped brown fovea, its septum pale, narrow, very slightly increas- 

 ing in breadth backward, and furnished with a fine longitudinal costa 

 cloven at the posterior extremity. — <? 2 ad. Length about 9 millim. 



Male. — Cephalotliorax broad, strongly rounded in the sides, shorter 

 than patella + tibia of the fourth pair, nearly as long as patella + tibia 

 of the first pair, its breadth equaling the length of the tibia of the fourth 

 pair; pars cephalica rather slightly convex transversely between the 

 hindmost eyes, its sides somewhat sloping, slightly rounded ; seen in 

 profile, the back of the cephalothorax is but very slightly concave, 

 nearly straight, between the posterior declivity and the hindmost eyes. 

 Front row of eyes straight or scarcely perceptibly curved downward, 

 these eyes being of equal size ; the central ones more distant from each 

 other than from the laterals, and separated by a space equaling their diam- 

 eter. Area of the posterior eyes much broader behind than in front, scarcely 

 longer than broad in front; the space between the two largest eyes a little 

 greater than their diameter, the space between them and the hindmost eyes 

 fully double as great as the diameter of these latter. Mandibles long and 

 narrow, scarcely thicker than the anterior tibife, somewhat shorter than 

 the tarsi of the first pair; the claw-furrow appears to be armed with three 

 teeth on the posterior and with two teeth on the anterior margin. Falpi 

 of moderate length ; seen from above, the patellar and tibial joints are of 

 nearly equal lengths, the patellar joint rather the longer of the two, with 

 parallel sides, rounded at the apex, somewhat longer than broad ; the 

 tibial joint is gradually and slightly broader toward the apex, as long 

 as broad, thickly hairy. The tarsal joint is somewhat longer than the 

 two preceding joints together, as broad as the anterior thighs, double 

 as long as broad ; the genital bulb is very high athe base ; seen from 

 the inner side, it is almost perpendicular behind, then sloping forward; 

 at the apex, on the outer side, it forms a thick and broad truncated 

 downward-directed lamina (when seen in profile) ; from the inner margin, 

 and closely applied to the inner side of the hindmost elevated part of 

 the bulb, and forming its anterior half on this side, proceeds downward 

 a very broad outward- and backward-curved costa rapidly narrowing 

 toward the apex, which goes over into the transverse costa which limits 

 the elevated part in front, outward; near the middle, toward the outer 

 margin, the bulb is armed with a strong spine, or long pointed tooth. 



