403 
towards the end and sharply ringed, thus looking quite as a fourth 
flagellum. The globulus is globular, rather large, its transverse 
il diameter conspicuously shorter than that of the upper branch; the 
stalk is short. 
Trunk. Slender. — The fifth pair of tactile setæ is short, 
scarcely longer than the breadtb 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 third pair is about three fourths as long as the 
fifth 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. 1c) 
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 essen- 
tial differences in the structure of the last pair (fig. 1d) are: the 
femur is as long as the trochanter, and the hair on the trochanter 
is biramous with long brancbes, while it is simple in the preceding 
Species; in both species the hair on the coxa is simple. 
Length. The adult and moderately extended female measures 
"72 mm. 
Locality. Isl. Koh Chang (Gulf of Siam), under stones, Jan. 
6. or 7. 1900 (Dr. Th. Mortensen leg.). 
VA 
