402 
Fig. 1. Tetrablemma samoensis. Right side of the 
prosoma with legs removed. 
Lip: Free, much wider than long. 
Sternum: Length 0.31 mm, breadth 0.34 mm, 
convex. Prolonged upwards between the bases 
of the legs. Hind legs widely separated. 
Palp: Long, tibia stout, tarsus large, smooth 
and pear-shaped with an upcurved spine at the 
tip. As in Figure 1. 
Legs: 
I IV 
II 
III 
Palp 
2.2 2.0 
1.9 
1.8 
1.3 
Patella 
and 
Femur 
Tibia Metatarsus 
Tarsus 
Total 
Palp 0.23 
0.20 
0.27 
0.70 
I 0.38 
0.39 
0.20 
0.22 
1.19 
II 0.32 
0.31 
0.17 
0.20 
1.00 
III 0.28 
0.30 
0.17 
0.20 
0.95 
IV 0.36 
0.32 
0.19 
0.17 
1.04 
Tibial Index I 4.6 
Tibial Index IV 
5.3 
Three claws. Tarsi with serrated bristles. Meta- 
tarsi with one and tibiae with three dorsal 
trichobothria. No spines. 
Abdomen: Length 0.75 mm, breadth 0.63 
mm. Large dorsal and ventral sclerites. Spin- 
nerets surrounded by a conical sclerite. Each 
side of the abdomen with three long narrow 
sclerites, and three similar ones between the 
dorsal sclerite and that surrounding the spin- 
nerets. Two broader ones in the corresponding 
space below. 
FEMALE: Length 1.18 mm. Color as in male. 
Carapace: Length 0.56 mm, breadth 0.42 mm. 
While in the male the carapace in side view is 
conical, with the eye-group at the apex, in the 
PACIFIC SCIENCE, Vol. XVIII, October 1964 
female the eye-group is more anteriorly placed, 
so that the carapace has a horizontal dorsal ridge. 
Eyes: Ratios of the diameters of the eyes and 
of their distances apart: AE, 56; PE, 64; A-A, 
17; A-P, 0; P-P, 41. Width of eye-group 0.11 
mm. Clypeus 0.16 mm. 
Chelicerae: Without the anterior horns. 
Maxillae and lip : As in male. 
Sternum: Length 0.31 mm, breadth 0.34 mm. 
Palp: Short and slender. No claw. 
Legs: 
IV I 
II 
III 
Palp 
2.1 2.0 
1.8 
1.7 
0.5 
Patella 
and 
Femur 
Tibia Metatarsus 
Tarsus 
Total 
Palp 0.12 
0.12 
0.06 
0.70 
I 0.42 
0.39 
0.18 
0.19 
1.18 
II 0.38 
0.32 
0.19 
0.19 
1.08 
III 0.31 
0.32 
0.16 
0.20 
0.99 
IV 0.36 
0.41 
0.22 
0.22 
1.21 
Tibial Index I 4.5 
Tibial Index IV 
5.6 
Abdomen: Length 0.82 mm, breadth 0.61 
mm. As in the male. Strong transverse fold near 
the posterior margin of the large ventral sclerite. 
The family Tetrablemmidae was erected by 
Cambridge (1873) for a single male T. medi- 
oculatum from Ceylon. The present male differs 
from this in the carapace, there being no promi- 
nence bearing small points anterior to the eyes, 
nor any row of prominent points round the 
margin. The shape of the horns on the chelicerae 
and of the palpal organ also appear somewhat 
different. Another species, T. okei, was described 
by Butler ( 1922 ) from a female from Victoria, 
Australia. The shape of the carapace is slightly 
different but, otherwise, except for the presence 
of trichobothria in the present specimen, they 
are very similar. Because of these differences and 
the great geographical separation, a new species 
is established. 
AGELENIDAE 
A single male, collected by E. G Zimmerman 
viii-20-40 on Swains Island, appears to belong 
to the Agelenidae. This family is most unusual 
in the Pacific, and the only species attributed to 
