34 ATTID/E OF THE UNITED STATES. 188* 
spines on the femoral, tibial, and metatarsal joints of the four pairs, 
those on the metatarsi of the fourth extending to the base. 
The abdomen is black, covered with thick, short, black hairs, and 
having some long white hairs. At the middle point is a large, more 
or less triangular white spot ; posterior to this are two smaller some- 
what oblique white spots ; lower down and nearer the apex than 
these, but in a line with them, are two minute white dots. The spots 
are formed by scales, which through the microscope look like grains 
of rice. In some specimens there are two oblique white bands on each 
side, and a white band at the base. Some immature specimens have 
the spots orange colored instead of white. 
The venter is black with two whitish bands which approach each 
other, but terminate near the apex without meeting. 
FEMALE— Length. 15 min. ; width of abdomen, 5.6 mm.; length of ceph.th., 5.5 mm. ; 
width of ceph.th., 4.4 mm. 
Legs, 10.6, 9,9, 12.1. 
The cephalothorax is somewhat iridiscent in the region of the 
eyes. 
The palpus is long, rufous in color, with short white hairs at the 
joints, and otherwise covered with mixed black and white hairs. At 
the extremity of the tarsus is a thick brush of short dark hairs. 
The maxillae are rounded at the tip, instead of truncated, as in the 
male. 
The relative length of the legs is 4, 1, 2, 3. 
The epigynum presents a plate much longer than wide, with a 
large posterior opening. 
Habitat, United States. 
Observations. This species seems to be much larger in the AVest- 
ern than in the Eastern States. We have so far received no specimens 
from west of the Rocky Mountains. Attus audax of Ilentz is prob- 
ably a variety of tripunctatus. We have examined several specimens 
that had the markings of audax, and have found their epigynes to 
be like that of tripunctatus. 
A period of from fourteen to fifteen days is required for the 
development of the eggs of this species. 
For a good drawing of the male palpus of tripunctatus, by Mr. 
Emerton, see plate XX, ligure 6, of Ilentz’s Spiders of the United 
States, edited by Edward Burgess, Boston Society of Natural 
History, 18” a. 
