162 AMEEICAN SPIDERS AND THEIR SPINNINGWORK. 



No. 19. Epeira volucripes Keyserling. Plate VI, 1, 2. 



1884.' Epeira rolnrripes, Keyserling . . Verb. d. z. b. Ges. Wien., p. .528, pi. 13. Fig. 27. 

 1892. Epeira volucripes, Keyserling . . Spin. Amer. Epeir., p. 199, tab. ix., 147. 



Female : General colors dark yellow and brown for the fore part ; on the abdomen 

 yellow, with blackish to brown markings. Total length (two specimens), 11 (9.5) mm.; 

 cephalothorax, 4 (3..5) mm. long, 3..5 (3) mm. wide; head, 2 (1.3) mm. wide; abdomen, 

 8 (6.5) mm. long, 7 (6.2) mm. wide. 



CEPH.\LOTnoRAX : Corselet a rounded oval ; brown, with lighter tint.s on caput and 

 summit of corselet; well clothed with white hairs. Sternum cordate, as wide as long; 

 color brownish yellow, with a bright yellow median band ; lip and maxillse lirown, tipped 

 with pale yellow. 



Eves: Ocular quad on an eminence projectinn^ forward ; front as wide as long, and 

 wider than rear; MF separated about 1.5 diameter; ilR smaller than MF, and separated 

 less than one diameter; SF from MF about 1.3 their alignment; side eyes on tubercles; SF 

 larger than SR, the latter placed well to the sides, and marked with strong gray eyebrows; 

 front row very little recurved, the longer rear row procurved. Clypeus aljout two diameters 

 MF high ; grayish bristles on the margin. 



Legs : 1, 2, 4, 3 ; yellow, with brown apical and median annuli ; thiikly covered with 

 gray bristles and hairs, interspersed with strong brown and yellow spines ; palps colored 

 and armed as the legs. Manditiles brown, conical, rounded at the base, divergent at tips. 



Abdomen: Subtriangular ; widest at the base; somewhat arched to the distal spinnerets. 

 The dorsal base overhangs the cephalothorax, is pale yellow, heavily clothed with gray 

 hairs ; the folium has a yellow median herring bone pattern, flanked by lunettes of black 

 or blackish brown in two rows approximated towards the apex. The folium is not unlike 

 that of E. arabesca in its general form. The dorsal color extends over the sides in irregular 

 loops, margined b}' a scalloped black band that extends underneath. The venter is a broad 

 squarish band of yellowish brown, with two bright spots near the spinnerets and blackish 

 color within. The epigynum is rather short for such a large species, subtriangular, wide at 

 the base, spooned at the somewhat rounded top. (Plate VI., Figs, la, lb.) 



Male: Plate VI., Figs. 2, 2a. 7.5 mm. long; in general color and markings resembles 

 the female. The abdomen is somewhat lighter in color; tibia-II is not especially developed 

 in size or in clasping armature, being simply marked by several long strong spines, one 

 of which, on the inside, is longer and stronger than the others, and placed upon a slight 

 process ; the joint is also somewhat bent. 



Distribution: Savannah, Ga. (Marx Collection.) Keyserling reports the species from 

 New Hampshire and Tennessee; and from Haiti and Panama, Central America. This 

 indicates an elastic temperament, at once adapted to the rigors of New England and the 

 fervors of the tropics. I believe, however, that the species is not common in northern 

 latitudes, but belongs more especially to the southern feuna. 



No. 20. Epeira tranquilla, new species.' Plate VI, Figs. 3, 3a. 



Female : Total length, 4 mm. ; abdomen, 2.5 mm. long, 2.5 mm. wide ; cephalothorax, 

 2 mm. long, 1.5 mm. wide, and 1 mm. wide at the face. 



Cephalotuorax : Cordate ; coreelet rounded at sides, high in the middle, shelving 

 behind : head much depressed, sjmringly clothed with gray pubescence ; corselet grooves 

 rather distinct ; cephalic suture distinct ; color yellow, with brownish flecks along the mar- 

 gins and in the sutures ; pubescence gray ; the hairs thick on the caput, particularly at the 

 sides, where they form strong gray eyebrows. Sternum shield shaped, wide at the base, 

 where it is rather squarely truncate ; obtusely triangular at the apex ; color yellow, with 

 darker marks on the margin and an interrupted median band of brownish yellow ; labium 



^ In his catalogue Dr. Marx refers to this spider as E. Heidmannii, in Hit. (page 544) ; and again as 

 E. tranquilla Keyserling, in lilt, (page 548). I have hence adopted the name Tranquilla. 



