368 Wisconsin Academy of Sciences, Arts and Letters. 
Cephalothorax rather low and flat (scorpiona), or high and 
convex (picata, americana). Eye region plainly longer than 
wide, wider behind than in front or equally wide (scorpiona), 
occupying about 2-3 or, in picata and americana, 1-2 of the ceph- 
alothorax. Eirst row of eyes very slightly curved; middle eyes 
twice, or nearly twice, as large as lateral. Second row much 
nearer the first than the third. Dorsal eyes large, forming a row 
as wide (picata, americana) or not quite as wide (scorpiona) 
as the cephalothorax. Ealces vertical, small, with a compound 
tooth on the lower margin; labium as wide as long (picata, 
americana) or wider than long (scorpiona). Sternum, oval. 
PECKHAMIA AMERICANA P. 1892. 
Plate L, figure 4. Plate LI, figure 1. 
1892. Synageles americana P., Occ. Pap. Nat. Hist. Soc. Wis. II, 1, 
p. 65. 
Length, S 4 mm.; $ 5 mm. Spines, S $, tib. I 3-3; 
met. I 2-2, tib. II 3-3, met. II 2-2. This spider closely 
resembles picata, but in that species the cephalic part is shorter 
and the posterior slope is quite different, there being a slight 
ridge behind the depression from which the thorax falls steeply 
on the sides and behind. In americana the cephalic part occu¬ 
pies a little more than half, the depression is less marked, and 
the elevated part behind the depression rounds out on the sides 
and behind instead of falling steeply. Picata is a much darker 
spider than americana, which is reddish rather than black. 
Color, $. The body and legs, except the posterior two thirds 
of the abdomen and tarsi of the second pair of legs, which are 
dark, reddish. In some specimens the cephalic part is darker 
and all the legs approach more nearly the markings seen in 
picata, though the dark purple iridescence on the patella and 
tibia is never present. In the female there is more red than 
in picata but the differences are not so accentuated. In cases 
of doubt the epigynum is the only certain criterion. 
