226 AMERICAN SPIDERS AND THEIR SPINNINGWORK. 



Female: Total length, 7 mm. ; cephalothorax, 2.2 mm. long; width in middle, 1.6 

 mm. ; width in front, 0.9 mm. ; abdomen, 5.1 mm. long, 3.6 mm. wide. The species diflPers 

 from C. tm-binata in its genital organ, but may be at once easily distinguished by the 

 absence of the two shoulder humps. 



Ceph.\i,othokax : Corselet, mouth parts, and sternum uniformly brown, or Ijlackish 

 brown; caput sometimes a little lighter color; the latter is covered freely, the former 

 sparsely, with gray hairs ; dorsally flat ; caput not higher than corselet ; median fosse small ; 

 corselet grooves not deep ; cephalic suture distinct. Labium obtusely pointed, and maxillse 

 broader than long. 



Eyes: Ocular quad elevated; wider in front than behind, and decidedly longer than 

 wide; MF separated by about 1..5 diameter, larger than MR, which are separated by about 

 or less than one diameter. SF removed from MF by about the area of MF ; side eyes not 

 contingent ; SF larger than SR, and not much less than MF. Clypeus margin separated 

 from MF by 1.5 to 2 diameters; front row recurved, rear row longer, nearly aligned, or 

 even a little recurved. 



Legs : 1, 2, 4, 3, as follows : 7.6, 6.7, 6.3, 4.5 mm. ; color yellow, with decided brown 

 apical and median annuli; armed with hau-s, bristles, and long, thin, acute spines. The 

 mandibles retreat backward. 



Abdomen: A rounded oval; at the apes a more or less conical protuberance, which is 

 directed upwards; color yellowish white, or whitish, with brownish side, and a dark longi- 

 tudinal folium, which is sometimes indistinct, compressed about the centre, and irregularly 

 indented on the edges. The venter black, with a large angulated long white spot on each 

 side ; four white small spots near the base of the spinnerets. 



Male: Total length, 3.6 mm.; cephalothorax, 0.2 mm. long, 1.0 wide in the middle, 

 0.7 mm. in front; abdomen, 1.8 mm. long, 1.4 mm. wide. The cephalothorax is quite 

 pointed in front, overhanging the clypeus, dorsally flat, without grooves. Mandibles much 

 shorter and thinner than patella, one directed backward. The legs have long spines ; 

 tibia-II not thickened, and has no special clasping armature. Cosa-I has a small toothlike 

 tubercle ; coxa-IY has two vertical, sharp, and strong spines. On the outside of the maxilla 

 is a pointed, spinelike tubercle. 



Distribution : Numbers of this species have been collected in California, where they 

 appear to be abundant, especial!}' in the southern parts. It is found in Utah (Professor 

 Orson Howard), and I have taken it in Florida. Emerton appears to have found it in Kew 

 England. The facts of distribution, as thus far reported, would seem to indicate the intro- 

 duction of the species by immigration from Europe. 



No. 78. Cyclosa Walckenaerii (Keyseelisg). Plate XVn, Figs. 1, la-d, 



1892. Epeira Walckenaerii, Keyserling . Spinnen Amerikas, Epeiradfe, p. 98, v., 85. 



Female: Total length, 6.5 mm.; cephalothorax, 2.5 mm. long, 1.7 mm. wide; abdomen, 

 4 mm. long, 2.5 mm. wide. 



Cephalothorax : Oval, squarely truncate at the base, high in the middle, the sides 

 rounding to the crest, in which is located the fosse, a deep circular pit; color glossy brown, 

 with grayish pubescence ; corselet gi-ooves indistinct ; the cephalic suture, on the contrary, 

 is so strongly marked that it presents almost the appearance of a neck, the suture passing 

 entirely around the corselet. (Fig. lb.) The head is thus quite divided from the central 

 portion of the corselet, the anterior being flattened into the necklike connection above 

 referred to. The head is rounded, somewhat quadrate or bluntly triangular; the vertex is 

 nearly as high as the crest of the corselet, slightly depressed at the face, which is broad ; 

 the color is brown, interspersed with gray hairs. The sternum is an elongated shield, 

 longer than wide, the apex prolonged and rounded, the sternal cones strongly marked, rising 

 into high rounded knobs before coxae-I, with a smaller cone between these two; these are 

 all colored yellow, as is the apex, and a connected median band in the centre of the 

 shield, giving thus a curious lumpy appearance to the organ. (Fig. la.) Outside of these 



