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DESCRIPTION OF GENERA AND SPECIES. 269 
Mate: About the size of the female, which it closely resembles in form, color, and 
markings. The eyes (2a) are arranged substantially as in the female, though the rear eyes 
appear to be relatively somewhat larger. The front row is almost straight. The radial 
joint of the palp (2b) is short, scarcely equaling in length the cubital. The digital joint is 
rounded at the base, and very long. 
Disrrizurion: District of Columbia (Marx Collection). Keyserling’s original description 
was made from a specimen found by Dr. Marx in Harrisburg, Pennsylvania. The species 
probably inhabits the Atlantic and Middle States. 
No. 115. Pachygnatha xanthostoma C. Kocu. Plate XXVI, Figs. 7, 8. 
1845. Pachygnatha xanthostoma, C. Kocn . . Die Arach., xii, p. 148, Figs. 1068, 1069. 
1883. Pachygnatha wanthostoma, KeyserurneG, N. Spinn. Amer., y., p. 659, pl. 21, Fig. 9. 
1889. Pachygnatha xanthostoma, Marx. . . Catalogue, p. 553. 
Fematr: Total length, 4.5 mm.; cephalothorax, 1.5 mm. long; abdomen, 3 mm. long, 
1.8 mm. wide. 
CrrHALorHorax : Cordate, rounded at the edges, well elevated in the centre; corselet 
grooves distinct; cephalic suture well marked; head elevated about corselet level, arched 
upon the summit to the eye space; color brown, with lighter streakings upon the sides. 
Sternum widest near the base, pointed like an arrow head towards the apex; raised in the 
middle, Color dark brown, with lighter median shade; covered with short, rather stiff 
hairs. Labium subtriangular, wide at the base, more than half the height of the maxille, 
blackish brown color; maxille elongate, longer than wide, convex externally, pointed 
toward one another, the tips roundly truncate. Color yellowish brown. 
Eyrs: Ocular quad (7a) slightly elevated, the length somewhat greater than the rear 
- width; wider behind than in front. MF somewhat smaller than MR, separated by 1.5 
diameter; MR by 1.7 to 2 diameters. Side eyes upon low tubercles, nearly contingent; SF 
larger than SR. Space between SF and MF about equal to the area of the latter, or 1.5 to 
2 times the interspace of MF. The distance between SF and SR is slightly greater than 
the interspace of SR. Front eye row recurved, rear row slightly recurved, and somewhat 
longer; the clypeus height about equals area MF. 
Lras: 1, 2, 4, 8; color uniform yellow to yellowish brown, without annuli; palps 
colored and armed as the legs; mandibles brown, widest at the tips, which are cut with 
an incline inwardly toward one another (7a); fang not reaching the maxille; teeth 3-4, 
nearly uniform in size. 
AppomEN: Oval; the dorsum evenly arched. The dorsal folium with three to four 
indentations; dark brown to yellow in color, outlined by black, and with a median blackish 
band. The sides have an interrupted band of yellow, beautifully reticulated, followed lower 
down by a dark brown belt, which touches the venter, which is a blackish band extending 
between spinnerets and epigynum (7b), which is a simple atriolum. 
Mare: (Fig. 8.) From 3 to 8.5 mm. long,’ closely resembling the female in color, 
form, and markings. The radial joint of palp (8b) is scarcely longer than the cubital, and 
is less than half the length of the digital. A slight spur marks the dorsal apex of the 
mandibles; the teeth number 3-4, and are of nearly uniform size; the fang has no decided 
angular projection on the inferior surface. 
Disrripurion: The examples from which the aboye description was made were found 
in the neighborhood of Philadelphia. Dr. Marx has collected the species in Pennsylvania 
and in the District of Columbia. It is probably common throughout the Eastern and 
Middle United States. Mr. C. L. Koch described both male and female from specimens 
collected in Pennsylvania. 
1The male of Koch’s original description is, on the contrary, somewhat larger than the female, 
instead of smaller, as here. 
