1 86 
Psyche 
[June 
in the M.C.Z. and the A.M.N.H. Hadros is a Greek adjective 
meaning “stout” or “thick”. 
description. See Tables I, II, and III which contain measure- 
ments, meristic characters and diagnostic ratios for a sample of the 
species and for the holotype. 
Male. Carapace: (Figs. 6, 19). Quite broad. Post, part of 
thoracic groove expanded laterally; center of thoracic groove about 
2/3 distance from ant. to post, border of carapace. Setae present 
only near edge of carapace and around eye group. Pars cephalica 
moderately elevated; highest anteriorly at eye group. Height of 
clypeus at ALE much less than vertical diam. of ALE. Diam. of 
AME slightly greater than their distance apart. Sternum: (Fig. 37). 
Nearly as wide as long. 3 post, pairs of sigilla oval, 2 posterior-most 
pairs usually drawn out and tapered toward edge of sternum, post, 
pair most drawn out. Chelicerae : (Figs. 9, 46). Apophysis thick 
and short, weakly curved downward distally. Apophyseal setae 
strong, post, ones non-attenuate and stiff. Pedipalps: (Figs. 14, 57). 
Tibia with greatest diam. in lateral view about 1/3 the distance 
from proximal to distal end, tapering to much smaller diam. distally. 
Outer conductor sclerite of palpus heavily sclerotized, serrations 
strong, end concave with one side extending beyond other. Inner 
conductor sclerite extends well beyond end of outer conductor sclerite 
in unflexed condition; distally tapering, only slightly curved and 
relatively thick. Leg I: (Figs. 71-73). Tibia with group of mostly 
enciform macrosetae at proximal end on prolateral surface, a smaller 
group (sometimes only 1 ) of macrosetae proximally on retrolateral 
aspect of ventral surface and 1 (rarely o or 2) macroseta near mid- 
dle ventrally. Tibia nearly cylindrical, curving downward slightly 
at distal end; swollen slightly at proximal groups of macrosetae. 
Explanation of Plate 15 
Figs. 78-79. Female genital region, A. hadros, paratype, from type 
locality. 78. Semidiagrammatic long, section through a median seminal 
receptacle, ant. and post, lips slightly pulled apart. 79. Posterior ventral 
view of genital region, (a.l. — anterior lip, p.l. — posterior lip, b.cop. — 
bursa copulatrix, o.b.cop. — opening of the b.cop., ut. — uterus, sem.r. — 
seminal receptacle) [0.5 mm scale line for 79] 
Figs. 80-94. Seminal receptacles (dorsal view). 80-86. A. riversi. 80. 
from D. 81. from C. 82. from San Geronimo, Marin Co., Calif. 83. from 
Guerneville, Sonoma Co., Calif. 84. from Placerville, El Dorado Co., Calif. 
85. from I. 86. from G. 87-89. A. hadros. 87-88. paratypes, from type 
locality. 89. from Little Grand Canyon, Jackson Co., 111. 90-94. A. gertschi. 
90. paratype, from O. 91. from Crater L. Natl. Pk., Klamath Co., Ore. 92. 
from N. 93. from M. 94. from P. [0.5 mm scale line for 80-94] 
