Peckham—Revision of the Attidce of North America. 481 
Front coxae separated by barely the width of the labium, which 
is as wide as long. Legs usually 1423 in the male and 4132 in 
the female. In both sexes the first and second have 3-3 spines 
below, and, anterior lateral, and the metatarsi 2-2 below. 
CHARACTERISTICS OP THE THREE SPECIES. 
Upper sides and top of cephalothorax uniform gray; sides 
widely rounded out; clypeus in male covered with salmon-col¬ 
ored hairs; no black spots on distal joints of palpus in female 
.undata. 
Top of cephalothorax with a wide gray band, bounded by dark 
brown; sides not much rounded out; clypeus of male covered 
with white hairs; distal joints of palpus in female with black 
spots.californica. 
Top of cephalothorax with a white band bounded by dark 
rufus; sides widening in thoracic part only; clypeus white; fe¬ 
male palpus yellow, without black spots . melanognathus. 
MARPISSA UNDATA DE GEER. 1778. 
Plate XXXIX, figs. 1—la. Plate XL, fig. 1. 
1778. Aranea undata De Geer, Mem. pour servir a l’Hist. des Ins., 
p. 320. 
1845. Attus familiaris and rupicola H., Jour. Bost. Soc. Nat. Hist., Y. 
1846. Marpissa undata, conspersa and varia C. K., Arachn., XIII, pp. 
60, 61, 69. 
1875. Attus famiuiaris and rupicola H., Occ. Pap. Bost. Soc. Nat. 
Hist., II, pp. 56, 61. 
1888. Marptusa familiaris P., Wis. Acad. Sciences, Arts and Letters, 
VII, N. A. Attidae, p. 80. 
1891. Marptusa familiaris Em., Trans. Conn. Acad., VIII, New Eng¬ 
land Attidae, p. 19. 
1892. Marptusa rupicola B., Proc. Acad. Nat. Sci. Phila., p. 79. 
1898. Marptusa undata B., Ent. News, June, p. 142. 
Length, $ 9.5 mm., $ 10.5 mm. Legs, $ 1432, $4132, 
first pair a little the stoutest. 
The cephalothorax has the top and upper sides covered with 
