403 
towards the end and sharply ringed, thus looking qnite as a fonrth 
flagellum. The globulus is globular, rather large, its transverse 
diameter conspicuously sborter than that of the upper branch; the 
stalk is short. 
Trunk - Siender. - The fifth pair of tactile setæ is short, 
scaicely longer than the breadth of the segment, very thin, with 
the pubescence exceedingly delicate but proportionately long on the 
distal half. The fourth pair could not be measured; it is excee¬ 
dingly thin. The thiid pair is about three fourths as long as the 
tifth pair, its shape and pubescence about as in P. oculatus ; a ter¬ 
minal bulb is wanting. — The dorsal setæ on the last segment are 
short and sharply ringed. 
Anal Segment. The tergum is rather similar to that in P. 
oculatus, but the setæ are shorter and more robust; it agrees still 
more with that in the following species. The submedian setæ are 
somewhat shorter than the distance between them; the intermediate 
pair is very short, and the lateral pair slightly longer than the sub¬ 
median setæ. — The styli are clavate and even a little longer than 
the submedian setæ. — The sternum with the posterior setæ al¬ 
most four times longer than the submedian pair; the lateral pair 
is longer than the lateral dorsal setæ. — The anal plate (fig. lc) 
is a little longer than broad, the lateral margins are considerably 
diverging, the posterior angles are broadly rounded, and from the 
hind margin project two rather short, cylindrical branches at some 
distance from each other. 
Legs. They are shaped almost as in P. oculatus. The esseu- 
tial differences in the structure of the last pair (fig. Id) are: the 
feinui is as long as the trochanter, and the hair on the trochanter 
is biramous with long branches, while it is simple in the preceding 
species; in both species the hair on the coxa is simple. 
Length. Ihe adult and moderately extended female measures 
'72 mm. 
Locality. Isl. Ivoh Chang (Gulf of S i am), under stones, Jan. 
6. or 7. 1900 (Dr. Th. Mortensen leg.). 
2(5* 
