360 
PACIFIC SCIENCE, Vol. XII, October, 1958 
each, but one or two of the setae at the pos- 
terior end of the genital sclerites are very 
nearly smooth. Three pairs of genital acetab- 
ula placed well back in the genital opening, 
decreasing in size from anterior to posterior. 
Anal sclerites present, but so well concealed 
by surrounding setae that their form and 
chaetotaxy were not ascertainable. Ventral 
hysterosomal setae arising from truncate, 
conical sclerites (Fig. 3). 
Base of gnathosoma with posterior ventral 
margin deeply concave; both base and ros- 
trum with numerous curved, peripectinate 
setae. Velum simple, circular in outline, con- 
taining a central circlet of converging fim- 
briae. Four or five very slender, sparsely 
peripectinate setae arising from distidorsal 
surface of rostrum, and extending beyond the 
tip of the rostrum. Four or five setae ar- 
ranged in a diagonal row posterolaterally to 
the velum. On the ventrolateral aspect of the 
rostrum are blunt setae, roughly rounded and 
smooth at the tips (Fig. 21). 
Chelicerae (Figs. 22, 23) arched dorsally, 
fairly straight along the ventral margin. Dor- 
sal membrane well developed and blunt. 
Tarsus of chelicerae with a row of 8 to 10 
dorsal teeth in the distal half; at about the 
middle of the dorsal margin the row of teeth 
bends sharply down over the side of the tarsus 
where an additional 12 or 13 teeth of progres- 
sively diminishing size are found. Trochanter 
of palp with 9 or 10 elongate peripectinate 
setae in a fairly straight row down the pos- 
terior surface of the segment; anterior surface 
of trochanter bare, distal margin distinctly 
excavated. Odontus of tibia very heavy, un~ 
divided. Setae of tibia ranging from nearly 
smooth on anterior and posterior surfaces to 
very heavy and serrate along the dorsal mar- 
gins. It is not known whether these setae are 
primarily serrate, or whether this condition 
arises as a result of a wearing or breaking off 
of the barbs. All of the setae of the tibia, with 
the exception of the odontus, are long, slen- 
der, and fairly flexible; no ctenidium is pres- 
ent. Each palpal tarsus in the specimen 
studied with 11 eupathidia ranging from .56 
or .68;/ to .95 or . 96 ^; the solenidia lie at .87 
to .92 p (one on each tarsus). The striated 
appearance of the solenidion is apparent only 
under favorable conditions. 
Tarsus I 486-495 /x long, 153 /x high, 
length/height 3.24; tibia I 261 /x long, tarsus 
I/tibia I 1.86-1. 90 (one specimen). 
larva: Idiosoma (Figs. 41, 44) 387 to 441 
fi long, 225 to 252 fx wide, length/width 1.73 
to 1.88; average of 10 unengorged larvae 419 
by 234 fx, length/width 1.80. Anterior margin 
of scutum truncate, with two heavy setae in- 
serted dorsally just behind the margin; ros- 
trum and palpi extending beyond the margin 
of the scutum. Just anterior to the level of 
coxa I is a prominent suture on either side of 
the scutum, these sutures not quite reaching 
to the lateral margin. Anterior to the sutures 
the margin of the scutum is characteristically 
marked by undulating striae. The remainder 
of the scutum is densely and uniformly punc- 
tate. Sensilla and the neighboring setae faintly 
barbed, the prosensillar setae completely 
smooth. Postscutum virtually as wide as the 
scutum (average ratio 1.09, 11 specimens), 
faintly punctate, bearing a pair of setae behind 
the middle of the plate. Ocular plates very 
small, bicorneate, completely lateral in posi- 
tion. Including the setae of the postscutum, 
there are 24 peripectinate dorsal and marginal 
setae; venter with 6 peripectinate postcoxal 
setae, making a total of 30 postcoxal and 
postscutal setae. Except for setae of post- 
scutum, all these are borne on individual 
sclerites which bear a few punctae. Mem- 
branous cuticle appearing smooth at low 
magnifications, but faintly striate at higher 
magnifications. 
Coxa I with a greatly enlarged rakelike seta 
anteromedially, bearing 10 to 15 digitiform 
teeth, identical in form with corresponding 
seta of P. quadriseta n. sp. (Fig. 63); antero- 
lateral seta of coxa I elongate, slender, peri- 
pectinate. Coxa I with an elongate, sharp 
supracoxal seta; II and III without such a 
seta. Urstigma large. Coxae II and III sep- 
