224 AMERICAN SPIDERS AND THEIR SPINNINGWORK. 
mandibles are cylindrical, arched at the base, glossy, and slightly pubescent; yellow, with 
darker shades at the base. 
AspoMEN: Well arched, rounded to the spinnerets, which are situated well under the 
apex. The dorsum is marked by a broad black median band, varying but little in width 
from base to apex, but with contractions at two points near the middle; whitish yellow 
marginal bands mark the outlines, and double rows of whitish spots symmetrically arranged 
are grouped along the median band on each side the median line. The sides are marked 
by whitish yellow irregular patches, running longitudinally along the base, but on the sides 
and towards the apex sloping to the spinnerets. Beneath the abdomen is dark brown, the 
venter marked by two whitish yellow broken lines, well separated, running from the 
epigynum to the spinnerets; within these, symmetrically arranged on either side of the 
median line, are buttonlike rows of whitish yellow spots, unequal in size, and somewhat 
narrowing toward the spinnerets. The epigynum is without a prolonged scapus, and shows 
simply a cuplike atriolum, separated into two chambers, within which the opening of the 
oviducts appear. (Plate I., Fig. 5.) 
This beautiful specimen, by the flat form of its cephalothorax and the location of the 
spinnerets beneath the abdomen, approaches Argiope more closely than the typical Epeira. 
The eyes, however, more closely resemble those of Epeira, the front row being recurved, as 
in Epeira, instead of procurved, as usual in Argiope. The rear row also is but slightly 
procurved, as in Epeira, instead of greatly procurved, as in the typical Argiope. For this 
reason I place it here rather than create for it a new genus, which might perhaps properly 
be done, as a connecting link between Argiope and Epeira. 
Disrrreurion: Fort Yuma, Arizona. (Marx Collection.) Only a single specimen col- 
lected. 
Genus CYCLOSA, Mrnan, 1876. 
In Cyclosa the cephalothorax is cordate or oval, the head arched and elevated 
aboye the corselet. The sternum is wide at the base, somewhat longer than broad. The 
maxillz are as in Epeira. The labium is relatively smaller. The eyes are divided into 
three groups; the front eyes of the central group upon a projecting eminence; the quad 
longer than wide; the clypeus is moderately high; the sidefront eyes are divided from the 
midfront by a space greater than that which separates themselves; the front row is decidedly 
recurved, the rear row aligned, or nearly so. The legs are, in order of length, 1, 2, 4, 3; 
stout, rather scantily pubescent, the spines being long, thin, and aculeate. The abdomen 
is an irregular oval, thickest at the apex, marked in some species by shoulder humps, and 
in others by a conical projection from the dorsal median that has the appearance of a tail. 
The apical jvall is high, the venter conical, and the spinnerets situated well beneath the 
middle part thereof. 
No. 76, Cyclosa turbinata (Watckenarn). Plate XVII, Figs. 5, 6. 
1842. Epeira turbinata, WaALcKENAER . Ins. Apt., ii., p. 140. 
1850. petra caudata, Hentrz .... . J. B.S§., vi. p. 23; Sp. U. S., p. 126. 
1888. COyclosa turbinata, McCook . . . Revised Nomenclature, Proceed. Acad. N.§., Phila. 
1889. Cyclosa caudata, McCoox . . . . Amer. Spiders and their Spinningwork, I., II. 
1890. Cyclosa turbinata, Marx .. . . Catalogue, p. 549. 
Femate: Total length, 5 mm.; cephalothorax, 1.7 mm. long, middle width 1.2 mm., 
front width 0.7 mm.; abdomen, 3.4 mm. long, 2 mm. wide. 
CernaLorHorax: Corselet a rounded oval; caput and the somewhat higher anterior 
part of the corselet are roundly arched; cephalic suture deep; the fosse small; sternum flat, 
longer than broad; maxillee and labium broader than long; color, as also sternum and 
mouth parts, dark brown or black. 
Eyes: Ocular quad somewhat longer than broad, wider in front than behind; MF 
separated by about 1.3 diameter; MR smaller than MF, and separated by less than their 
