399 
P. vulgaris, and its three pairs of setæ present the same relative 
length and arrangement, with the exception that the intermediate 
pair is considerably removed from the posterior margin and inserted 
obliquely in front of the lateral pair. — The styli are half as 
long as the submedian pair of setæ and shaped as clavate hairs. 
— The sternum has the posterior setæ more than three times as 
long ås the submedian dorsal pair, which is a little longer than 
the lateral ventral pair. — The anal plate almost as in P. gra- 
cilis; it is broader than long, strongly widening posteriorly, and 
from the angles project two considerably diverging branches which 
are longer than the breadth of the plate; from the hind margin origi- 
nate near the base of the outer branches two rudimentary branches. 
Legs. They are robust, very short and increase slightly in 
length posteriorly. The last pair (fig. 4e) with the femur a little 
shorter than the trochanter, scarcely longer than thick and almost 
as long as the tibia, which is about one half longer than thick; the 
tarsus is thick and almost one half longer than the tibia. The hairs 
on coxa and trochanter are biramous with the branches moderately 
slender; the seta on the tibia is not one third as long as the joint. 
Copulatory Organs. As far as could be ascertained they are 
short, robust, conical, with obtuse apex. 
Length. The female measures "43 mm., the male "38 mm.; 
both specimens are somewhat contråcted. 
Locality. Posadas in Argentina, June 1900 (Dr. F. Sil- 
vestri. leg.). 
Remarks. This exceedingly small species is closely allied to 
P. gracilis, but is easily distinguished by the terminal part of the 
third pair of tactile setæ and by the position of the intermediate 
dorsal setæ on the anal segment. 
19. Pauropus oculatus n. sp: 
Pl. V, fig. 5a—5 f. 
"Material. One adult and well-preserved male. 
Head (fig. 5a). The eyes are moderately broad and excee- 
