A REVISION OF THE PISAURIDAE OF THE UNITED STATES 33 
The males of but six of the eleven species of Dolomedes de- 
scribed herein are known; these resemble the females in color and 
markings except that the pattern is often more highly developed. 
The males of D. tenebrosus, D. okefinokensis and 
D. triton are considerably smaller than the females; they reach 
maturity earlier in the season and often escape detection when the 
females are conspicuous. Males of D. scriptus, D. albi- 
neus, and D. vittatus have smaller abdomens, but the 
legs are proportionally and sometimes actually longer than in the 
females. 
Key to the Species of Dolomedes 
Males 
A A spinose hump on the femur of the fourth leg beneath 
B Tibial apophysis very long, extending almost one-half the length of 
the bulb D. triton Walckenaer p. 50 
BB Tibial apophysis short, extending only to base of bulb 
D. vittatus Walckenaer p. 47 
AA No spinose hump on the femur of the fourth leg beneath 
B Median apophysis of bulb stout, small at base, dilated distally, 
produced to a point on the side toward tip of embolus 
C Apophysis of tibia short, concave internally, broadly notched at 
tip; venter of abdomen with a definite median, light stripe 
from genital furrow to spinnerets; abdomen above white or 
grayish white marked with light brown 
ID ealib iinexs i lentz ps3 
CC Apophysis of tibia broadly dilated and deeply notched distally ; 
venter of abdomen without a definite median light stripe; 
abdomen above crossed by several transverse W-shaped white 
lines De Sic ipib thse eventZ \pa44 
BB Median apophysis of bulb slender; distal half narrow, ribbon-like, 
almost transparent 
C Median apophysis acutely angled at middle of its length; basal 
half abruptly swollen in the middle 
D. tenebrosus Hentz p. 4o 
CC Median apophysis nearly right-angled at middle of its length; 
basal half not conspicuously swollen 
DY wolwe fi nioikie nisiiis iinov. 'spyp!..3o 
Dolomedes albineus Hentz 
Bost. Jour. Nat. Hist. 1845, 5:189-190, pl. 16, fig. 2 
Type: D olomedes albineus Hentz; type specimen not known to exist 
Type locality: Alabama 
Female (alcohol): length 20-283mm; average 24mm; legs 4-1-2-3, 51-48-47- 
Atmm; pl. 12; pl. 14) figs. 2-3 
‘Cephalothorax above, light reddish or yellowish brown, dorsal and 
radial grooves darker and bearing brown hairs; scattered patches 
of short, white hairs, indistinct in alcohol, between radial grooves ; 
extreme margin black; head slightly darker, somewhat elevated, sides 
thickly clothed with short, white hairs. Eyes of the anterior row in 
a slightly recurved line, median somewhat larger than the lateral and 
2 
