164 AMERICAN SPIDERS AND THEIR SPINNINGWORK. 



spinous bristles on the coxa 1 ; color yellow, slightly tipped at joints with brown ; palps marked 

 and armed as legs, but apparently without annuli ; mandibles articulated in facial plane, 

 conical ; separated at the tips, margins provided with long spinous bristles of yellow color. 



ABDOMEN : Triangular ovate on top, widest at base ; dorsum but slightly arched in the 

 specimen in hand; the dorsal folium consists of an anchorlike figure with double flukes; 

 the muscular pits strongly marked; at the margins touched with brown or blackish color; 

 quadruple liaes branch from the middle towards the apex, and darkish lateral lines encom- 

 pass the sides, which are yellow ; pubescence on the doreum rather scant, but on the base 

 a tuft of whitish gray bristles, around which are clustered whitish or yellow hairs. The 

 ventral pattern a bluntly triangular patch, narrowing towards the yellow spinnerets, which 

 it encompasses ; at either corner are broad circular or irregular patches of yellow or yellow- 

 ish white; the base of spinnerets surrounded by an interrupted ring of yellow patches, 

 especially marked with golden yellow hairs, deepening at places into brown ; the epigynum 

 (Fig. 4a) has a prominent scapus, which is widest at the base, having a sort of pedestal of 

 yellow color, and enlarged at the middle point, where the channel begins, and again widen- 

 ing towards the tip, which is rounded and spooned ; it is l>ent venterward, the color deep 

 brown and glossy. 



MALE : I have no male from which to describe, and have drawn the figure of the male 

 palp (4b) from a manuscript drawing of Count Keyserling. 



DISTRIBUTION : Fort Bridger, Wyoming ; Washington State. (Marx Collection.) If we 

 accept this species as entirely identical with E. punctigera of Doleschall, it is of wide dis- 

 tribution throughout the world, including the Mauritius (Keyserling) ; Australia, where Koch 

 describes it, and the Malasian Islands, where it is described by Thorell. It is found only 

 on our western coast, which may indicate that its distribution from the east to the west 

 has been by commerce across the Pacific Ocean, in which respect it resembles E. Theisii. 



No. 22. Epeira mormon KEYSERLIX<;. Plate VI, Figs. 5, 5a. 



1882. Epeira mormon, MARX in litt. . . Catalogue, p. 546. 



1892. Epeira mormon, KKYSKRLING . . . Spinn. Amerik., iv. Epeir., p. 182, pi. ix., 134. 



FEMALE: Total length, 5.5 mm.; cephalothorax, 2.5 mm. long, 1.7 mm. wide, narrowing 

 to 1 mm. at the face; abdomen, 3.5 mm. long, 2.5 mm. wide. The general colors of this 

 species are uniform yellow in the fore part, with brown and brownish yellow and cretaceous 

 longitudinal stripes upon the abdomen. 



CEPHALOTHORAX : Cordate, high in the middle, which is peaked, sloping backward 

 sharply to the truncate base ; corselet grooves distinct ; cephalic suture deeply marked ; color 

 yellowish brown, with brown median band from the fosse to the face; skin glossy, slightly 

 pubescent; sternum black or blackish brown, heart shaped, deeply indented at the edges; 

 sternal cones marked ; high in the middle, pubescent ; labium subtriangular, large ; maxilla? 

 as wide as or wider than long; obtusely triangular at the tips, which are yellow, while the 

 base is brown in color, thus resembling the labium. 



EYES : Ocular quad on a low eminence, most prominent before ; decidedly wider in 

 front than bShind, and the sides rather longer than the front. MF somewhat larger than 

 MR, separated by about 1.5 diameter ; MR propinquate, separated by less than a radius. 

 Side eyes on very slight tubercles, propinquate, not greatly differing in size. MF separated 

 from SF by a space about equal to their area, or 1.3 times the intervening space. The face 

 is yellow, the vertex evenly rounded. The clypeus has a height about 1.5 or more diameter 

 MF. The front row is slightly recurved, the longer rear row slightly procurved. 



LEGS: 1, 2, 4, 3; uniform yellow, with a slight darkening at some of the tips; 

 pubescence and bristles yellow ; well provided with acutely yellowish spines, with rows of 

 especial strength underneath the femora. 



ABDOMEN : A long oval, rounded both at base and apex ; color yellow ; the arched 

 dorsum traversed by a folium of blackish brown, with indented margins that inclose a field 

 traversed by three longitudinal stripes of lighter brown. Short gray hairs cover the skin, 



