1914] Chamberlin—New Diplopod from the Galapagos Islands 87 
Nesodesmus gen. noy. 
Head strongly granulo-tuberculate. Antennz short, clavate, 
with the fifth article thickest and much the longest. 
Dorsum strongly elevated and convex; strongly sculptured, 
being densely granular and tuberculate over the entire surface of 
keels as well as remaining portion of metazonites; a longitudinal 
row of larger tubercles each side of the median line, the tubercles 
increasing in size caudad with a tendency to be confluent. Spir- 
acles on segments 5, 7, 9, 10, 12, 13, 15 and 16, each opening through 
a thick, subeylindrical papilla borne on the marginal lobe second 
from the caudal corner. Keels large, depressed, covering the legs 
from above, almost contiguous, laterally mostly deeply lobate, 
the lobes either 3, or by subdivision of the anterior one, 4 in num- 
ber, the caudal border of keel also deeply lobate and the anterior 
one of most less strongly lobed. 
First dorsal plate broadly extended a covering the head as 
in Lophodesmus. ‘Typically showing 12 rounded teeth or crena- 
tions along the anterior margin corresponding to the twelve lobules 
marked off on the border by 11 radial sulci. 
Anal tergite short and broad, its caudal margin convex in gen- 
eral outline; a broader median portion notched at the middle on 
each side of which are two sharply separated narrow lobes or teeth. 
In the type species the keels of the nineteenth tergite are produced 
caudad a little beyond the caudal margin of the anal plate. 
Genotype: N. insulanus sp. nov. 
This genus is apparently most closely allied with Lophodesmus 
as represented in Central America and Mexico. It is separated 
chiefly because of the difference in the position of the spiracle and 
the form of its papilla on the carinal margin, this occurring near 
the middle of the side instead of at the caudolateral corner; in 
the deeper lobation of the lateral border and the larger number of 
its divisions and in the lobation of the anterior as well as of the 
caudal border; and in having the entire dorsal surface of the keels 
as well as of the median portion of the metazonite strongly 
tuberculate. The first tergite has its anterior border divided into 
12 lobules instead of the 10 characteristic of species of Lophodes- 
mus thus far known. 
