A New Platydesmoid Diplopod from 
California 
By RALPH V. CHAMBERLIN 
From Dr. Hilton I have received an adult and several imma- 
ture specimens of the interesting new genus below described. 
The male is not yet known. 
Gosodesmus, gen. nov. 
A genus differing from Platydesmus and Brachycybe in its 
much narrower keels, the body as a whole being slender, more as in 
Dolistenus and Pseudodesmus, body differing from that of the last 
mentioned genus in being much more depressed, the keels hori- 
zontal or, on anterior segments, upturned. Keels for the most part 
laterally a little thickened or margined. Dorsum of each segment 
with two transverse rows of large tubercles which are laterally 
compressed, in part cariniform, the median ones not greatly en- 
larged as in Pseudodesmus, pores not pedicillate; opening at 
margin. Fifth segment normal. Head as in Brachycybe; no eyes 
present. 
Genotype.—G. claremontus, sp. nov. 
Gosodesmus claremontus, sp. nov. 
The dorsum of the type is fulvus, in part of a distinct reddish 
or pink tinge. The venter paler. 
Head shaped nearly as in Brachcybe lecontii but somewhat 
narrower and the antennae a little more clavate. 
Keels of first five segments bent forwards, laterally strongly 
rounded. Keels of sixth and seventh segments also bent forwards 
but with the lateral margins straight at middle, the corners, how- 
ever, widely rounded. On subsequent segments the keels have the 
posterior corners extended a little caudad, the production becoming 
pronounced in the caudal region. Keels of the penult segment pro- 
duced directly caudad, nearly as far as caudal margin of last 
tergite. Lateral margins of keels caudad of the eighth with 
straight portion longer, slightly indented at middle, margined. 
The angles on all keels remain rounded, but the posterior ones in 
the more caudal segments narrowly so. Caudal margin of keels 
toward mesal or proximal end bulging or shouldered, the caudally 
extending portion abutting against or a little overlapping the 
anterior border of the succeeding keel. First tergite with six 
tubercles in each row, or with one or two extra ones in an indistinct 
third row along anterior border. Tergites of middle region of 
