MILLIPEDS OF PANAMA—LOOMIS 87 
Oncodesmoides angulatus, new species 
FIGURE 2b 
Hotoryrer, Male, USNM myriapod collection 2636, Pifia area, 
Canal Zone, March 18, 1958, H. F. Loomis. 
ParatyPes: Male and 2 females, USNM; male and female, Snow 
Museum; several males and females, author’s collection, same data 
as holotype. Canal Zone, Barro Colorado Island, June 6, 1923, 
O. F. Cook and H. F. Loomis; August 1956, C. W. and M. E. Retten- 
meyer; March 8-15, 1958, E. M. and H. F. Loomis; Frijoles, July 
13, 1923, H. F. Loomis; Fort Sherman, April 20, 1925, O. F. Cook— 
all in author’s collection. Panama, Juan Dias, June 3, 1923, O. F. 
Cook and H. F. Loomis; Almirante, November 28, 1937, H. F. Loomis; 
El Valle, March 22, 1958, E. M. and H. F. Loomis—all in author’s 
collection. 
Diaenosis: Principally differing from the other species in details 
of the gonopods, the closest relationship being with O. rectus Kraus 
from Peru. 
Description: Length 11 to 13.5 mm., diameter 2.3 to 2.56 mm. 
Vertex of head, segment 1, and metazonites of other segments dull 
black; front of head, antennae, prozonites, and ventral surfaces, 
including legs, colorless. 
Front of head hispid, finely roughened but shining, the sides swollen 
laterad of each antenna; vertex with a short, thick, uneven ridge on 
each side in front projecting outward, with its anterior portion cover- 
ing part of the first antennal joint from behind; surface between 
the ridges and elsewhere behind them finely and evenly granular- 
tubercular but lacking setae. 
First segment almost semicircular, anterior margin straight across, 
with a small indentation a short distance from each lateral angle; 
surface inflated on each side of middle and with larger tubercles than 
in the broad median depression, the largest being adjacent to the 
anterior margin mesad of the excavation; all tubercles with an apical 
seta. 
Segment 2 with sides vertical, greatly expanded in front and below, 
the posterior margin with two deep notches above the lower limits; 
median surface flat, as wide as segment 1, its anterior margin deeply 
and evenly concave; the expanded sides joining the dorsum in almost 
a right angle marked in front, in strongly sculptured specimens, by 
a raised ridge, which is a continuation of the anterior side margin, 
the ridge followed by two or more large, elongate tubercles. 
From segment 3 backward there are four longitudinal rows of large 
dorsal tubercles increasing in size on segments 17 to 19, three tubercles 
