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DESCRIPTION OF GENERA AND SPECIES. 267 
Genus PACH YGNATHA, Sunpnrvatt, 1823, 
Pachygnatha, like Tetragnatha, is distinguished by its strong, elongate, curved jaws, 
widely separated at the apex, and armed with formidable teeth. It is distinguished from 
Tetragnatha, on the other hand, by an ovate abdomen, but little longer than wide. The 
cephalothorax is oval, its skin hard and glossy; the caput rounded and elevated above 
the corselet, the grooves and cephalic suture distinct. The sternum is longer than wide, 
decidedly aculeate at the apex, with distinct sternal cones; wide at the base. The labium 
is long, wide at the base, more than half as long as the maxilla, which are decidedly 
longer than wide, a little compressed at the shank, convex on the outer margin, and 
inclined toward each other. The legs are in order of length 1, 2, 4, 3, nearly all without 
ordinary spines, but freely clothed with soft, long, aculeate bristles. The palps are long, 
and armored as the legs. The mandibles are formidable, elongate, resembling those of 
Tetragnatha. The eyes are in three groups, the central quad upon a high eminence; the 
side eyes upon tubercles less elevated; the space between the midfront and sidefront eyes 
is somewhat greater than the area of MF, twice and more the intervening space thereof, 
as in Epeira, The clypeus is extremely high, being more than 1.5 times the area of MF, 
as in Theridioid genera. The front eye row is slightly recurved, the rear row more or less 
procuryed. 
No. 113. Pachygnatha brevis Krysrriinc. Plate XXVI, Figs. 9, 10; XXVIII, 2. 
1882. Pachygnatha tristriata,1 Krysertine . Neue Spinn. Amerik., iv., 209, Zool. Bot. Ges. 
Wien., p. 17. 
1883. Pachygnatha brevis, Knyseruine . . . Ibid., v., p. 658. 
1884. Pachygnatha brevis, Emerton ... . N. E. Ep., p. 366, xxxiy., 21; xl., 8-10. 
1889, Pachygnatha brevis, Marx. ..... Catalogue, p: 553. 
Fremate: Total length, 5.5 mm.; cephalothorax, 2.5 mm. long, 1.6 mm. wide; abdo- 
men, 3.5 mm. long, 2.6 mm. wide; mandible, 1.8 mm. long. 
CrpHALorHorAXx: Glossy, with scant pubescence, the skin punctured; a dark band of 
brown along the margin, a median ribbon of light color extending from the forehead to 
the base of the corselet, on either side of which is a wide band of yellow; head well 
elevated, quadrate, somewhat depressed in the middle of the vertex, with a lumpy appear- 
ance on either side; corselet grooves and cephalic suture distinct. Sternum almost an 
equilateral triangle, elevated in the middle, and punctured. Labium blackish; maxille 
glossy brown. 
Eyrs: Ocular quad (9a) almost square, but slightly wider behind; eyes not greatly 
differing in size. MF slightly larger; side eyes propinquate, smaller than the middle 
group, of about equal size, separated from MIF by a space about equal to the area of the 
latter, or one and a half to two times the intervening space. Front eye row slightly 
recurved, rear row procurved. The space between SR and MR is wider than that between 
SF and MF, the arrangement of the eyes resembling Epeira. Clypeus height about twice 
area MF; on one side a ridgedlike elevation extending from the margin to the midfront 
eyes. 
Lxas: Uniform glossy yellow, with slight dark annuli at the tips of the joints; palps 
uniform yellow ; mandibles with four large teeth on the exterior furrow; long, soft bristles 
on the apex; color glossy yellow; fang dark brown, and slightly waved upon the under 
surface. 
Aspomen: Ovate, dorsum evenly arched; skin yellowish brown, covered with bright 
yellow reticulations; dorsal folium wide, with three marginal indentations; color yellowish 
* Count Keyserling originally described the species under this name of Koch’s, but a year later pro- 
posed the name “ brevis,” 
