(i. W. AND E. G. PECKHAM. 
13 
188:! 
The quadrangle of the eyes is a quarter wider than long, and 
wider behind, the cephalothorax dilating beyond the dorsal eyes. The 
dorsal eye is as large as the lateral, and is in a line with it ; the small 
median eye being nearer the lateral eye, on a line with its upper bor- 
der, and situated on a low elevation. The anterior row of eyes is 
slightly curved, a straight line from the top of the middle eyes cut- 
ting the lateral eyes above the center. The middle eyes are sub- 
touching ; the lateral are more widely separated, and are less than 
half as large. The clypeus is about one-half as wide as the middle 
eyes, and is slightly inclined ; it is covered with long yellow hairs, 
which also surround the middle eyes. 
The palpus is slender and pale. 
The falces are long, vertical, rather slender (being but little wider 
than the middle eyes), and pale. The fangs are weak. 
The maxilla; are enlarged and rounded at the extremities. 
The sternum is oval, long and pale. The anterior thighs are sep- 
arated by more than the width of the lip at the base. 
The relative length of the legs is 4, 3, X, 2 ; they are short in com- 
parison with the size of the spider. The first and second pairs are 
stouter than the third and fourth. They are pale, with slightly darker 
rings on the distal ends of the joints. There are very weak femoral, 
tibial and metatarsal spines on the four pairs. 
The abdomen is pale yellow, with small black dots and hairs irreg- 
ularly disposed over the back and sides, leaving an unspotted median 
longitudinal narrow band. The dots and hairs are more numerous 
toward the base. The spinnerets are pale and slender. 
The venter is pale and unspotted. 
The epigynum presents a large dark spot and two overlapping 
plates on each side. The opening, at the posterior edge, is long and 
inconspicuous. 
Habitat, Pennsylvania. 
Observations. For this species we are indebted to Mr. Philip Nell. 
X. Attus arizonensis, new. 
(Plate II, Figures 10 to 10a.) 
MALE— Length, 11 mm.; width of abdomen, 3 mm. ; length of ceph.th., 4.9 mm. ; 
width of ceph.th., 4.2 mm. 
Legs. 
Fern. 
Pat. 
Tib. 
Metat. 
Tar. 
Total 
1 . 
8. 
2.1 
2.8 
24 
1.4 
11.4 
o 
2.7 
1.7 
1.9 
1 . 6 * 
1.1 
9. 
8. 
2.8 
l.tt 
1.7 
1.7 
.9 
9. 
4. 
8.2 
1.7 
2.4 
o 
1 . 
10.8 
The cephalothorax is high; the cephalic and thoracic parts are 
equal in length; the thoracic part slopes abruptly from the depression 
which divides it from the cephalic part. This depression is deep and 
