428 
PACIFIC SCIENCE, Vol. XI, October, 1957 
cuticle between ocular plates and scutum de- 
void of setae. Dorsal and marginal body setae 
(Fig. 84) borne on prominently elevated seti- 
gerous sclerites uniformly distributed over the 
distinctly striated membranous cuticle. 
Coxa I with about 60 simple, smooth 
setae, plus 6 to 9 simple, smooth setae on the 
pars medialis coxae which appears to be a 
discrete medial expansion of I (Fig. 82). 
Supracoxal seta I absent. Coxa II with 45 
setae. Membranous area between coxae I and 
II of right and left sides with 79 smooth setae, 
borne on individual sclerites. Behind coxa 
II a wide (75 /jl) band of striated cuticle devoid 
of setae. Marginal setae especially dense be- 
tween II and III, borne on sclerites which are 
markedly convex but not cylindrical. In the 
single specimen available, no trace was found 
of the characteristic organ just anterior to 
coxa III in Lassenia lasseni. Coxa III with 41 
setae; IV with 55 (Fig. 75). No apodemes 
visible between II and III. Genital opening 
(Fig. 67) large, with three pairs of genital 
acetabula; genital sclerites very narrow, cres- 
centic, bearing 34 to 36 slender, smooth setae, 
mostly in a single to double row. Paragenital 
sclerites with 52 to 55 similar setae in a single 
to triple row. The setae on both sets of scler- 
ites are fairly uniformly spaced except at the 
ends where there are fewer setae than at levels 
in between. Ventral body setae borne on hemi- 
spherical sclerites, membranous cuticle marked 
with regular but not parallel striae. Anus (Fig. 
68) lacking well-defined sclerites, surrounded 
by cuticle only faintly differentiated from that 
of rest of venter. 
Velum circular to oval in outline, numerous 
fine filaments converging from a well-defined 
marginal rim (Fig. 71). Protorostral and trito- 
rostral (? see larva) setae present and well 
developed; ventral surface of gnathosoma 
otherwise with 80 to 100 smooth simple setae 
on either side of the bare mid-ventral line 
(Fig. 66). Rostrum very short, blunt, extend- 
ing scarcely beyond the end of the trochanter 
of the palp. 
Chelicerae (Figs. 74, 85) with distal half of 
tarsal claw slightly raised, knifelike, appearing 
minutely serrate under oil immersion. Tro- 
chanter of palp (Figs. 66, 69) devoid of setae 
and also without any trace of the fenestration 
which characterizes the palpal trochanter of 
the other genera; trochanter considerably 
longer anteriorly than posteriorly. Terminal 
segments of palp covered with many long, 
slender, smooth setae. Tibia with a uniden- 
tate terminal seta and a stout subterminal seta 
at 0.67^, the latter bearing a basal tooth or 
spur. A few of the dorsal setae of the tibia, 
at least in the distal half, are slightly heavier 
than the other setae, but are not otherwise 
different from them. Palpal tarsus with a large 
eupathid at 0.57V, and five other eupathids at 
0.73 a, 0.81 V, 0.94^, 0.95 p, and 0.97V. A single 
solenidion at 0.84 p (Fig. 83). 
Chaetotaxy of legs approximately as shown 
in table (s = solenidia, e = eupathidia, f = 
famulus, v = vestigial setae, c = companion 
setae, n = normal setae, m = many). 
All segments of all legs beyond the basi- 
femur with one or more eupathidia, recog- 
nizable by their reverse curvature. Vestigial 
setae fairly long and slender, about half the 
length of the surrounding solenidia 3 , confined 
to patella I and II, absent from tibiae. Tibiae 
with numerous s 3 (Figs. 77, 78) I and II with 
only about one seta each which could be 
assigned to type four. Tarsus I with three Si 
at 0.73V to 0.l6pd, plus four others at 0.27 to 
0.33V which may possibly belong in this cate- 
gory. Solenidial types Si and s 4 are convergent 
in form and difficult to differentiate. Tarsus I 
tr 
bf 
tf 
pa 
ti 
ta 
n 
n 
s 3 
e 
s 3 
e 
V 
S 3 
s 4 
e 
V 
Si 
s 2 
S 3 
s 4 e 
f 
I 
18 
m 
2 
1 
63 
3 
1 
m 
1 
4 
0 
3-7 
7 
0 
m m 
1 
II 
33 
m 
1 
1 
20 
3 
1 
20 
1 
2 
0 
4 
1 
0 
io± 20 ± 
1 
III 
30 
m 
1 
1 
26 
2 
0 
16 
0 
3 
0 
0 
0 
0 
7=*= 3,4 
0 
IV 
40 
m 
1 
1 
35 
2 
0 
28 
0 
2 
0 
0 
0 
5* 
0? 2 
0 
