268 AMERICAN SPIDERS AND THEIR SPINNINGWORK. 



brown, with blackish margin and ligliter median band, and at the apex blackish, trans- 

 verse, interrupted lines. The venter shows a brownish, yellow band, extending from the 

 spinnerets to the epigynum ; the latter organ is placed about the middle of the abdomen, 

 and is a simple arch. 



Male : (Fig. 10.) In size, color, and markings almost precisely resembles the female. 

 The lumpy appearance on the forehead and margin of the clypeus is a little more pro- 

 nounced. The middle group of eyes is almost a perfect square, instead of having the rear 

 a little wider, as in the female. One very long, strong tooth marks the angle of the 

 mandibles upon the inner furrow row, and at its base are three shorter, blackish teeth ; on 

 the same furrow there is a short, strong tooth near the base of the fang. The fang is 

 glo.ssy brown, somewhat uneven on the exterior surface, and the middle point on the 

 interior is prolonged into a blunt angle. The fangs, when folded, extend almost to the 

 maxillae. The palps (10a) are long, the radial joint somewhat longer than the cubitil ; the 

 digital bulb globular, the cymbium contracted in the middle, extending far beyond the 

 bulb, heavily covered with stiff bristles. From the base of the alveolus, on the upper side, 

 is a long, yellow projection, and from the apex of the bulb a blackish brown curved pro- 

 jection extends almost as far as the point of the cymbium. 



DiSTRrBUTioN : This species has been collected from Canada southward through New 

 England, New York, and Pennsylvania, as far as the District of Columbia. It will probably 

 be found throughout the entire Middle States and Atlantic Coast. 



No. 114. Pachygnatha aiatumnalis Keyserling. Plate XXVI, Figs. 1, 2. 



1883. Pachygnatha autumnaUn, Keyserling, Neue Spinn. Amerik., v., 660; xxi., 10. 



1884. Pachygnatha autumnalls, Emerton . . N. E. Ep., 337, xxxiv., 22 ; xl., 9. 

 1889. Pachygnatha autumnalu, Marx . . . Catalogue, p. 553. 



Female: Total length, 4.3 mm.; cephalothorax, 2.3 mm. long, 1.1 mm. wide; abdomen, 

 2 mm. long, 1.3 mm. wide. 



Cephalothorax: Oval, squarely truncate behind; fosse an oval pit; corselet elevated, 

 skin glossy, slightly pubescent, color blackish brown, with brownish yellow stripes on 

 either side of the median band and on the margin ; caput of like color, elevated ; the head 

 at the eye space prominently raised into a quadrate elevation, upon which the middle 

 group of eyes is placed. Sternum (Ic) subtriangular in form, slightly longer than wide, 

 uniform yellowish brown color, scantily pubescent. Labium triangular, very wide at the 

 base, more than half the height of the maxillfe, which are longer than wide, convex on 

 the exterior, somewhat narrow at the rounded tip, and inclined toward each other. The 

 fangs, when folded, extend as far as the maxilhe. 



Eyes : Ocular quad decidedly wider behind than in front, and the width as great as, 

 or even greater, than the front ; MF somewhat smaller than MR, separated by about one 

 diameter ; MF separated by 2 to 2.5 diameters. Side eyes contingent, upon tubercles, and 

 about equal in size ; space between MF and SF but little greater than that between MF. 

 The space between MR is greater than that between ]SIR and SF. Front eye row almost 

 aligned, or slightly recurved, the longer rear row decidedly procurved. The appearance of 

 the eye space from the front shows MR elevated above SR, which stands out upon a lower 

 notch from the forehead. The clypeus is extremely high, at least three times the space 

 between MF. The side view of the cephalothorax (la) shows the quadrate elevation of the 

 eye space. 



Legs: Legs and palps a uniform yellow. The mandibles glossy, dark brown; about 

 1 mm. long. 



Abdomen : Ovate ; dorsum evenly arched ; the folium a wide, glossy, brown belt, with 

 marginal indentations, about three in number ; in the middle an indented line of cretaceous 

 yellow ; a broad, interrupted band of yellowish white extends along the sides ; dorsal 

 surface reticulated. The ventral pattern is blackish brown, with marginal stripes of reticu- 

 lated, cretaceous yellow. 



