DESCRIPTION OF GENERA AND SPECIES. 259 
powerful than in the female. The abdomen is cylindrical, or subcylindrical, elongated, 
decidedly longer than wide. The legs are long, attenuated, sparsely clothed with long, 
aculeate spines, and more abundantly with bristles and hairs. The number of rows of spines 
down the tibia is ordinarily about three; upon the metatarsus from two to three ; upon the 
femora, ordinarily from six to eight. The orbicular snare is commonly hung horizontally, 
or at an angle more or less inclined. It is frequently found near or immediately over 
water, as the species affect humid places and the banks of streams. While seated upon its 
snare the four front legs are usually stretched: out straight before the face. 
No. 106. Tetragnatha extensa (Linnmus). Plate XXV, Figs. 3, 4, 5. 
1758. Aranea extensa,’ Linnaus. . . . Syst. Nat., Ed. x., i., p. 621. 
1763. Aranea Solandri, Scororr . . . . Entomologia Carniolice, p. 397. 
1763. <Aranea Mouffeti, Scororr . . . . Ibid., p. 398. 
1805. Tetragnatha extensa, WatcKENarr, Tabl. d. Aran., p. 68. 
( 1837. Tetragnatha obtusa, C. Koc . . Uebers. d. Arachn. Syst., i., p. 5. ? 
1842. Tetragnatha versicolor, Wauck.. . Ins. Apt., ii., p. 215; Aspor, G. S., No. 466. |~ 
1861. Tetragnatha extensa, Wesrrina . . Aranez Svecice, p. 84. 
1864. Tetragnatha eatensa, Buackwau.. Sp. G. B. & I., iiy p. 337, xxviii, 265. 
1866. Tetragnatha extensa, Muxar . . . Preuss. Spinn., i., p. 90, pl. 15, tab. 26. 
1866. Tetragnatha obtusa, Menck . . . Ibid., p. 93, pl. 15, tab. 27. 
1870. Tetragnatha extensa, THorrrn . . Synonyms European Spiders. 
1877. Tetragnatha eatensa, Tuorrii . . Aranez Colorado,’ Bull. U. 8. Geol. Survey. 
1884. Tetragnatha extensa, Emerron . . N. E. Ep., 333, pl. 39, Figs. 9, 10. 
1889. Tetragnatha extensa, McCook . . Amer. Spiders and their Spinningwork. 
Frmate: Total length, 8.5 mm.; abdomen, 6.3 mm. long; across base, 3 mm. wide; 
across apex, 1.5 mm. wide; cephalothorax, 2.5 mm. long by 2 mm. wide. The general 
colors of the fore part are yellow and yellowish brown, and of the abdomen various shades 
of yellow and greenish. While young, often a uniform light green (Fig. 5b). 
CrpHaLornorax: A long oval, truncated and indented behind, widest at the middle, 
flattened at the top; dorsal fosse deep; corselet grooves sufficiently distinct; cephalic suture 
distinct ; the head elevated above the corselet level; the caput wide, the projecting part or 
head of nearly equal width to the face; color, a warm yellow, with brown markings on 
sides of caput and margins of corselet ; skin glossy, pubescence scant. Sternum (5d) a long 
shield shape, tapering to a point, high in the middle, slightly pubescent; color, a broad, 
yellow median band, with blackish or dark brown margins; labium subtriangular, relatively 
shorter than in T. grallator; maxillee concave on the outer edges, of nearly equal width 
throughout, but widest at the tips. 
Eyrs: (8, 3b.) MF on a central prominence; the MR not thus elevated; ocular quad 
narrowest in front, the rear wide as, or wider, than the sides. MF smaller than MR, 
separated by 1.5 to 2 diameters, MR separated by 2 to 2.5 diameters. Of the side eyes 
SR are the larger; they are separated from one another by about two-thirds the space 
which divides MF from MR. MF are separated from SF by about 1.25 their area, and 
from the margin of the clypeus by about 2.5 diameters. The front row slightly recurved, 
the rear row slightly procurved, almost aligned. The distance between MR and SR is 
about equal to the space between the two MR. 
Leas: 1, 2, 4,3; first pair at least eight times length of cephalothorax; of uniform 
yellow color, except slightly darker annuli at the joints, feebly armed with pubescence, 
bristles, and a few blackish spines, The mandibles (3a, 3b) about seven-tenths the length 
SS CS ed a rela ee ale iol iil acon diner tie ie ths. Sonepat 
+ A complete synonymicon would fill several pages; I give but a few of the more important synonyms. 
* Professor Thorell appears to me in this report to haye confounded variations of this species with 
T. elongata (grallator). 
