402 ARANEIDEA. 
a. Cephalic region deeply bifid; anterior lobe incrassate, 
compressed at the apex. Tarsal sheath of pe'pme deeply 
emarginate at its apex . . 
6. Cephalic region bilobate, but not t deeply bifid ; ; anterior 
lobe evenly rounded. 
a‘. The two cephalic lobes having a deep concavity between 
them on each side below the anterior central eyes. 
Palpi with an obliquely transverse, circularly curved, 
conspicuous, black spine towards the apex of the bulb. 
6°. The two cephalic lobes without any concavities between 
them. Bulb of palpus with a stout, pale yellow, 
circularly curved, slender process towards the apex, its 
point directed upwards, but no transverse black spine. 
a’, Abdomen produced at the apex behind, and also with 
a slight rounded prominence on each side . 
67, Abdomen evenly rounded behind . . 
B. The four central eyes situated on the basal portion of ‘the 
posterior lobe of the cephalic region, the lateral pair on each 
side being situated close to the base of the fissure . 
Females. 
A. Abdomen compressed above, not apically developed, truncate 
posteriorly. 
a. Vulval area very small. Central scape very short-rounded, 
with reflexed margin; lateral concavities very small, cir- 
cular. (Abdomen with a single, small, central, posterior, 
dorsal tubercle, besides a lateral apical tubercle on each 
side.) rr a 
b. Vulval area very much larger. Central scape much 
longer, more pointed at the apex; lateral concavities 
larger, elongate-oval. 
a’, Abdomen with a single, very short, blunt, posterior, 
central, dorsal tubercle. Scape of vulva much longer, 
attenuate in the middle, dilate at the apex, recurved 
upwards. . . . 2 ee coe 
6’, Abdomen with three small, central, posterior, dorsal tu- 
bercles, the upper one short, the lower pair transversely 
situate and longer, bifurculate. Scape of vulva much 
shorter, neither attenuate in the middle, nor dilate at 
the apex, nor recurved upward, but depressed 
B. Abdomen not compressed above, but dorsally and apically 
developed. 
a. Apex of abdomen not bilobate. 
a’. Abdomen entirely covered with bright silvery scales, 
except on the ventral area and on the central anterior 
dorsal line. . 2. 1. 1 we 
argentatus, O. P.-Cambr. 
obtusus, O. P.-Cambr. 
americanus, Tacz. 
argenteo-maculatus, O. P.-Cambr. 
trigonus, Hentz. 
americanus. 
subdolus, O. P.-Cambr. 
maculosus, O. P.-Cambr. 
argentatus. 
