365 
oblong, distally narrowing plate which is about two and a half 
times longer than broad, while the distal portion is almost setiform 
and slightly shorter than the proximal; the outer branches are very 
siender, nearly setiform (in this specimeu curved) and as long as 
the proximal portion of the inner branches. 
Ugs. They are as long as in P. Huxleyi. The last pair is 
rather si milar to that in the species named, but the trochanter. 
femur and tibia are a little thicker. the tarsus is almost longer, and 
the seta on the tibia is very robust and scarcely three fourths as 
long as the joint. Furthermore, the upper half of the surface of 
the femur, tibia and tarsus is very conspicuously pubescent, but the 
minute hairs are proportionately stiff and thick at the base. 
Copulatory Organs (fig. 4 h). Seen from in front nearly their 
basal half is cylindrical, the distal part subconical with the inner 
margin straight and forming a very obtuse angle with the inner 
maigin of the basal part, the outer margin is slightly convex, and 
the apex is blunt. 
Length. The single adult male, which is somewhat contracted 
and considerably curved, measures probably about l’lmm. in length. 
Locality. The specimen was captured at Temuco in Chile 
(see p. 360). 
Remarks . This species is closely allied to P. intermedius , 
but differs from it in many features: the shape of the anal plate, 
the enormous dorsal setæ on the posterior segments of the trunk. 
length and thickness of the three posterior pairs of tactile setæ. 
the last pair of legs longer and pubescent on the upper side. the 
small globulus etc. It is therefore impossible to assume that botli 
ammals, which have been captured in the same locality togetlier 
with P. robus tus, can belong to one species. 
* 
Species 5—6. Tliese two Siamese species are scarcely allied 
to each other and besides rather remote from all other species of 
the genus. One of them, P. spinifer, shows a certain resemblance 
to P. Huxleyi in the shape of the anal plate, the place of the an- 
