392 Wisconsin Academy of Sciences, Arts and Letters. 
The drawing of the palpus of Howardii (1896) should show 
the end of the bulb rugose, and the tube notched as in audax. 
The palpi of the two species are almost exactly alike. 
PHIDIPPUS OPIFEX McCOOK 1883. 
Plate XXIX, figs. 7—7b. 
1883. Attus opifex McCook $, Proc. Acad. Nat. Sci. Philadelphia, p. 
276. 
1888. Phidippus opifex P. $, Wis. Acad. Sciences, Arts and Letters, 
VII, N. A. Attidse, p. 20. 
1890. Phidippus opifex McCook, American Spiders and their Spinning 
work, Vol. II, p. 149. 
1893. Phidippus opifex McCook, ibid., Vol. Ill, PI. xxix, fig. 11. 
1901. Pabn^eus geiseus P. and Phidippus opifex P. 5, Wis. Acad. 
Sciences, Arts and Letters XIII, pp. 288 and 301. 
Length, $ 9-11 mm., $ 15 mm. Legs, $ 1423, 9 4123, 
first and second pairs fringed and enlarged. 
In both sexes the integument is dark brown or black, covered 
above with silvery hairs, but while in the male the sides of both 
cephalothorax and abdomen are black, in the female they are 
covered with gray hairs like the upper surface. In the male 
there are four indented dots on the front part of the abdomen 
where the hairs are so thickened as to form white spots. We 
have seen one female in which the gray of the abdomen is tinged 
with red. This specimen has a lighter central wedge-shaped re¬ 
gion on the hinder half of the abdomen, the apex of which is 
over the spinnerets. The clypeus is covered with white hairs. 
The falces are dark brown or black, not iridescent, or only 
slightly so along their inner front sides, with a straggling growth 
of not very long white hairs, thickest on the upper part in the 
male. The legs are brown or black, much darker in some speci¬ 
mens than in others. In the female they are banded. The 
first pair is fringed with black and white, the colors alternating 
as is usual in Phidippus. The femur of the first, in the male, 
has black hairs above, and the palpus varies from light brown to 
