Peckham—Revision of the Attidce of North America. 445 
of the abdomen is black. At the base it is covered with whitish 
yellow hairs, through which there sometimes runs a transverse 
line of white hairs. Just behind this region is a large spot of 
bright red hairs which occupies the central anterior portion of 
the dorsum, and which, in the male, takes somewhat the form of 
an obtuse triangle. Behind this spot, and touching it, is a trans¬ 
verse band of white hairs (broader in the female) which is 
frequently (especially in the female) interrupted by black in 
the middle line. Behind this band the color of the middle re¬ 
gion of the abdomen varies from whitish to yellowish. Near 
the spinnerets is a line of white hairs which, in the female, is 
parallel with the white band; in the male it takes the form of a 
V pointing backward. The palpi in the male have dark tarsi 
and the other joints light. The maxillae and labium are brown, 
usually tipped with white. The venter is black, with a longitu¬ 
dinal band of white hairs on each side. The legs are black, and 
in the male the patella of the third leg has a brilliant bluish 
metallic lustre. 
Mr. F. O. P. Cambridge remarks that his Sidusa fulvoguttata 
“is probably identical .with Jotus (Dynamius) opiums, Peck- 
ham.” 
Habitat. Arizona, Mexico and Guatemala. 
ESCAMBIA P. 1896. 
1896. Escambia P., Occ. Pap. Nat. Hist. Soc. Wis., Ill, 1, p. 41. 
1901. Corythalia E. S. (in part), Hist. Nat. Araign., 2me Ed. II, 
p. 657. 
1901. Sidusa F. O. P. C. (conspecta, parvula, alacris), Biol. Cent. Am., 
Aran. Arachn., II, p. 196. 
Cephalothorax high and convex, nearly as wide as long, sides 
rounded; thoracic part falling in a rounded slope from dorsal 
eyes. Eye-region equally wide in front and behind or wider in 
front, about 1-4 wider than long, occupying 2-5 or more of the 
cephalothorax. Front eyes in a straight or nearly straight row, 
the middle less than twice as large as the lateral. Second row 
about halfway between the others, and third narrower than the 
