Peckham—Revision of the Attidce of North America. 58 & 
ZYGOBALLUS SEXPUNCTATUS H. 1844. 
Plate LI, fig. 11. 
1844. Attus sexpunctatus H. <$, Jour. Bost. Soc. Nat. Hist. IV. 
1875. Attus sexpunctatus H. Occ. Pap. Jour. Bost. Soc. Nat. Hist. 
II, p. 54. 
1888. Zygobaulus sexpunctatus P. Wis. Acad. Sciences, Arts and 
Letters, VII, N. A. Att., p. 89. 
Length, 3 3-4.5 mm., $ 3 mm. Legs, 3 1423, 9 4123^ 
femur I enlarged. Spines, 3 9 , tib. I 3-3, met. I 2-2, tib. II 
one pair and 2 serially below, with 1 anterior lateral; met. 
II 2-2. All the spines are long. The spines under tib. I are 
in regular pairs in small examples, but not in large ones. 
The cephalothorax of the male is bronze-brown with the front 
of the falces, the clypeus, and the sides of’ the cephalothorax be¬ 
yond the second row of eyes, covered with white scales. There 
is also a white spot, wider than long, at the beginning of the 
thoracic slope. This spot is not found in Bettini, which it other¬ 
wise closely resembles. The abdomen is of a darker bronze 
than Bettini, with the same basal band and two curved trans¬ 
verse bands usually broken in the middle, but in this species the 
black behind these bands is stronger, and, in the typical form, it 
indents the front transverse band so as to cut it into four oblique 
white bars, and also encroaches on the hinder band until there 
are left two similar bars. This form is easily distinguished 
from Bettini. When these characteristic marks are not present, 
or when the abdomen and the thoracic spot are rubbed, reliance 
must be placed upon the palpus, which has the bulb with a lon¬ 
gitudinal division, while in Bettini it is transverse. The first 
leg is usually red, but sometimes this color is confined to the fe¬ 
mur, the other joints being paler, with a longitudinal black line. 
The other legs are yellowish, sometimes with darkened femora. 
In this latter case the other joints show a variable degree of 
darkening. 
The female, to judge from our imperfect specimens, is bronze- 
brown. There are some indistinct white scales left on the eye- 
region, and the cephalothorax has a marginal white band. The 
