278 
PACIFIC SCIENCE, VoL IX, July, 1955 
than retroclaw. Tarsi 1 and 2 flattened be- 
neath and armed with numerous rod-like 
spines. Abdomen oval, spinnerets short. 
Genotype Gradungula sorenseni sp. nov. 
Gradungula sorenseni sp. nov. 
Figs. 1, 2 a-c 
FEMALE 
Measurements (in mm.): 
Length of cephalothorax . . . . 4.68 
Width of cephalothorax. .... 4.04 
Length of abdomen . 8.28 
Width of abdomen. ........ 5.23 
META- 
FEMUR 
PATELLA 
TIBIA 
TARSUS 
TARSUS 
TOTAL 
Leg 1. 
... 3.53 
1.29 
2.94 
2.58 
1.28 
11.62 
Leg 2. 
... 3.23 
1.34 
3.04 
2.78 
1.14 
11.53 
Leg 3. 
. . . 3.03 
1.34 
2.13 
2.77 
1.04 
10.31 
Leg 4. 
. . . 3.94 
1.48 
3.59 
3.78 
1.43 
14.22 
Palp... 
. . . 2.04 
0.74 
1.19 
1.69 
5.66 
Colour: Two longitudinal patches of deep 
yellow extend along the carapace and are 
separated by a median longitudinal dark 
brown band, which merges in front and be- 
hind with dark brown bands extending along 
the lateral margins. The ground colour of the 
abdomen is greyish brown with a median 
dark brown band extending down slightly 
more than half of the anterior dorsal surface, 
followed by an irregular transverse patch at 
three-quarters of its length. The dark brown 
areas are not formed by pigment but by 
closely spaced short black hairs. Chelicerae 
dark brown. Maxillae dark brown but an- 
terior margins creamy white. Sternum dark 
brown with black shading on the median 
surface. Legs and palps banded with alternate 
dark and pale brown markings. 
Carapace: The head region is narrower than 
the thoracic region, lateral margins sub- 
parallel, and relatively low but of the same 
height as the thoracic region. The lateral 
margins of the thoracic region are evenly 
rounded, widest between coxae 2 and 3 where 
the width is almost equal to the length of the 
carapace. A number of small setae are present 
on the clypeus and in the region of the eyes. 
A row of from 6 to 7 small setae extend back 
from the lateral eyes and a similar number 
extend back down the median line to the 
fovea. The fovea is longitudinal and deep and 
is surrounded by small setae. Faint traces of 
striae can be seen on the median surface of 
the carapace near the fovea. 
Eyes: From in front the anterior row is 
slightly procurved and the posterior row re- 
curved. From above the anterior row appears 
strongly procurved and the posterior row 
straight. The ratio of the eyes AME: ALE: 
PME:PLE = 2:5:4:4. The AME are separated 
from each other by a space equal to one half 
and from the ALE by twice of the diameter of 
an AME. The lateral eyes are sub-contiguous 
and are raised from the surface of the cara- 
pace by a small swelling. The distance be- 
tween the PME, the PME and the AME, and 
the PME and the PLE is in all cases equal to 
twice the diameter of an AME. The median 
ocular quadrangle is wider behind than in 
front in the ratio of 11:7. The height of the 
clypeus is slightly more than three times the 
diameter of the AME. AME black, remainder 
pearly white. 
Chelicerae: These are stout, directed forward, 
slightly divergent. Lateral condyles are ab- 
sent. There is a series of closely spaced 
parallel ridges on the retrolateral surface of 
each chelicera which has the appearance of a 
typical stridulating structure. The fangs are 
strong and evenly curved. Promargin with a 
row of eight strong teeth, retromargin smooth 
but with a row of closely spaced long setae 
which form a scopula (Fig. id, e ). 
Maxillae: (Fig. lb) These do not converge 
over the labium. The trochanter is inserted 
laterally and the basal portion of the maxilla 
is separated from the anterior portion by a 
distinct groove. The anterior margin 's di- 
rected obliquely inwards and is provided with 
a dense scopula, but a serrula is lacking. 
Labium: (Fig. lb) Free. Wider than long 
in the proportions of 14:11. Lateral margins 
slightly curved, anterior margin indented and 
provided with ten setae. 
