58 
REVISTA CHILENA DE HISTORIA NATURAL 
near the base, and farther down a row of strong bristles. At 
the hinder edge just below the widest point of the coxa there 
are two very stout bristles, and between these bristles and 
the apex of the coxa there is posteriorly only one more bristle, 
which is placed at some distance from the hind edge. 
The fourth tarsal segment, moreover, is shorter than in 
P. cocyti, being twice as broad as it is long in the foretar- 
sus and very little longer than it is broad in the hindtarsus. 
The fifth tarsal segment also is broader than in P. cocyti, being 
half as long again as it is broad in the foretarsus. The hindfemur 
bears a row of 7 to 11 bristles on the inside, and the hindtibia 
9 to 12 on the outside, which are often arranged in two rows in 
the male. The longest apical bristle of the hindtibia of the fema- 
le does not extend to the subapical pair of bristles of the first 
tarsal segment, while in the male this bristle reaches beyond 
the apex of the first tarsal segment. The first and second hind- 
tarsal segments have 4 very long and slender apical brstles, 
the longest of the second segment reaching nearlyto the tip 
of the fifth segment (claws excluded). 
The genitalia of the male also show some conspicuous diffe- 
rences. The movable process of the clasper is shorter than 
in P. cocyti, and bears a row of 6 or 7 slender hairs along 
the hinder edge from the base to the apex. The ninth ster- 
nite more nearly resembles that of P. corfidii Kothsch. (1904), 
and is distinguished by bearing numerous hairs at the apex 
and by the sahpe of the vertical portion. The bristles at the 
apex of the eighth teigite of the female are more numerous tan 
in P. cocyti, and the shorter ones stouter. 
We have a series of both sexes fron Valparaiso, found by 
J. A. Wolffsohn on Octodon degus. 
é/Tv» 
