1945] Southern Spiders 179 
tributed, by the ventral scutum shorter than the dorsal, and no 
chitinous ring about the spinnerets. 
Family Pisaurim; 
Genus Thanatidius Simon 1898 
Thanatidius tenuis (Hentz) 
Figures 1, 6 
Thomisus ? tenuis Hentz, 1847, p. 449, pi. 23, fig. 12 ; reprint, 
1875, p. 82, pi. 10, fig. 12. “ 2 Alabama.” 
Thanatidius tenuis Bishop, 1924, p. 18. 
Male. Length, 14.6 mm., ceph. 5.5 mm. long, 4.0 mm. wide, 
an. margin, 2.0 mm., abd. 10.2 mm. long, 2.5 mm. wide at 
base, I leg. 42 mm. long. 
Cephalothorax pale yellow, with a pair of narrow parallel 
darker stripes from p.m.e. to posterior margin, sparsely covered 
with short hairs, flat, thoracic groove very long and shallow, 
sides rounded and abruptly narrowed at region of posterior eye 
row to half the greatest width, an oblique row of bristles be- 
tween lateral eyes and margin; eyes apparently in four rows, 
anterior row strongly procurved, eyes subequal, a.m.e. sepa- 
rated by slightly more than a diameter and from a.l.e. by fully 
two diameters, posterior row strongly recurved, slightly longer 
than anterior row, p.m.e. subequal with a.m.e., separated by 
fully two diameters, p.l.e. largest of the eight, slightly raised 
and directed backward, lateral eyes separated by about as much 
space as between p.l.e.; quadrangle of median eyes higher than 
wide and wider behind than in front; clypeus below a.l.e. less 
than a radius of a.l.e., a row of long bristles on margin of 
clypeus; mandibles vertical, pale, few long bristles near median 
margin, fang groove rather short, lower margin with three 
subequal teeth; labium white, longer than wide; maxillae white, 
fully twice as long as labium, sides parallel; sternum white, flat, 
almost as wide as long, (4.0 : 4.5), with a few short bristles; 
abdomen a pale reddish-brown, very narrow, ending in a point 
above spinnerets, base bilobed, on sides a few dark dots, each 
bearing a short bristle, venter pale; legs , 1-2 -4-3, all very long 
and slender; spines, I pair, patella, lateral, 2, tibia, ventral, 
2-2 -2 -2-2, apical pair short, metatarsus, ventral, 2-2 -2 -2, all 
spines very long but not overlapping as in female; palpus , pale, 
not as long as cephalothorax, tibia longer than patella, but tibia 
