DESCRIPTION OF GENERA AND SPECIES. 227 



cones the color is brown, and there is a slight gray pubescence. The labium is wide, tri- 

 angular at the tip, which is yellow, the base being somewhat compressed, and brown; 

 raaxilliB as wide as or wider than long, the tips obtusely triangular, directed toward one 

 another; colored as the labium. 



Eyes: The ocular quad has the front eyes upon a semicircular prominence, is higher 

 in front, where it projects over the clypeus ; the quad is decidedly longer than wide, wider 

 in front than behind; MF larger than MR, separated by about 1.3 diameter, while MR are 

 almost contingent. The side eyes arc on elevated bases rather than tubercles; scarcely con- 

 tingent; SF larger than SR ; MF are separated from SF by about 1.3 their area, or at least 

 twice the intervening space of MF ; clypeus height about one diameter MF ; front eye row 

 much recurved; the longer rear row slightly procurved or aligned. 



Legs: 1, 4=2, 3; stout, yellow, with blackish brown apical annuli, and lighter median 

 ones; provided freely with bristles and hairs, and rather sparsely with stout black spines; 

 the palps have lighter color than the legs; the mandibles are long, parallel, as wide at the 

 tips as at the base, where they are well arched; somewhat receding; color glossy brown, 

 flecked with yellow. 



Abdomen: Oval, widest at the base, where it is marked by two conical shoulder 

 humps ; the front is rounded, somewhat narrowed, and overhangs the cephalothorax ; the 

 apex is marked by a wide conical hump, which is cleft at the top, and has a similar 

 smaller cone on either side; the dorsum is yellow, interspersed with brown, covered with 

 silvery white hairs; an indistinct folium, with a yellowish border inclosing a blackish 

 rectangular pattern, lies between the shoulder ' humps and the apical cones ; the venter is 

 conical, the spinnerets being placed at the apex, underneath the middle part of the abdo- 

 men; the color (Fig. la) is brown, with a circular ring of yellow spots around the base of 

 the spinnerets; the epigynum (Fig. lb) presents a wide, semicircular, arched atriolum, 

 yellow, with grayish hairs, from the centre of which issues the scapus, which is wide at 

 the base, narrowed and rounded toward the tips, which slightly overhang the genital cleft. 

 It apparently lacks one moult of maturity. 



M.\le: Plate XVII., Fig. 2. Smaller than the female. The cephalothorax has the 

 same general characteristics, but the interspace between the head and the corselet is not so 

 strongly marked. The head is well elevated. The abdomen is a rectangular ovate; the 

 dorsal cones smaller than in the female; the color is black, with cretaceous spots at the 

 base and near the middle. The legs are yellow, annulated with a light brown ; provided 

 with long, aculeate spines ; without any special clasping apparatus upon tibia-II. I cannot 

 positively identify the individual here figured as the male of Cyclosa cervicula, but consider 

 the identity as highly probable. 



Distribution: Two specimens, female, from California, one of them from Magdalena 

 Bay (Mr. C. H. Townsend) ; a male, San Diego, California, in the JMarx Collection. Keyser- 

 ling described the species from Guatemala specimens. 



No. 79. Cyclosa bifurca McCook. Plate XVII, Figs. 9, 10. 



1887. Cijrtophom. bifurca, McCooK . . . Proceed. Acad. Nat. Sci., Phila., p. 342. 

 1889. Cyclosa bifurca, McCook .... Amer. Spiders and their Spinningwork. 

 1889. Cyclosa bifurca, M.\rx Catalogue. 



m 



Female: Total length, 7.5 mm. ; cephalothorax, 3 mm. long, 2.3 mm. broad; abdomen, 

 6 mm. long, 3 mm. broad. 



Cephalothor.\x : The corselet high and well rounded ; the fosse deep, the grooves well 

 defined; cephalic suture deep and decided, sharply defining the head from the corselet; the 

 head is on the level of the corselet, and covered with grayish white hairs. The color is 

 green, fading out in alcohol to a light yellow. The sternum is shield shaped, darkish 

 brown along the margin, with irregular greenish median and radiating bands ; flattened ; 

 covered sparsely with gray hairs, pointed at the apex; almost as wide as long. The labium 

 large, triangular; the maxillpe rounded, about as wide as long; color of both the last named 

 organs green. 



