MILLIPEDS OF PANAMA—LOOMIS 105 
Descrirtion: Body very small, strongly convex, composed of 20 
segments which are crossed by 3 transverse rows of strongly clavate 
setae, most of which, especially the first 2 rows on anterior segments, 
curve dorsocephalad; lateral carinae narrow, continuous with dorsum, 
produced forward and with rounded anterior and posterior corners 
except on last few segments where the posterior corners are somewhat 
angular but not produced backward beyond posterior margin. Head 
densely setose above antennae, the frontal area with fewer and longer 
setae; antennae rather short and thick. 
Segment 2 projecting forward and downward considerably below 
both segments 1 and 3. Pores large, each opening from a sharply conic 
elevation near posterior margin mesad of corner of segments 5, 7, 9, 
10, 12, 13, 15-19. Last segment with apex narrow, deflexed, and 
slightly exceeding the valves. Last pair of legs with a slender seta 
at the dorsal apex of joint 5 that is longer than joint 6; similar setae, 
rapidly decreasing in length, are on legs immediately in front of last 
pair. 
Although males are lacking, sufficient outstanding characters are 
shown by the females to provide identification marks for future 
specimens of this genus. 
Hypsiloporus proclivis, new species 
FicureE 5f-g, 6a 
Hototyrn: Female, USNM myriapod collection 2645, Barro 
Colorado Island, Canal Zone, March 8-15, 1958, E. M. and H. F. 
Loomis. 
ParRAtyPES: Female and juvenile specimen, author’s collection, 
same collection data as for holotype. 
Description: Body 2.5 mm. long; white in alcohol; surface of seg- 
ments, both above and below, finely but distinctly reticulated. 
Head densely covered with very short erect setae; antennae short 
and stout (fig. 5f); joints 2, 3, and 4 subequal in length and width; 
joint 5 of same length but much wider, equaling joint 6, which is 
considerably longer. Anterior end of body shown in figure 5g. 
Segment 1 broadly semioval, posterior margin straight, outer angles 
abruptly rounded; 3 transverse series of clavate setae curving dorso- 
cephalad, 10 near anterior margin, 4 across middle, and 6 near pos- 
terior margin. 
Ensuing segments with three transverse rows of similar setae, those 
of the first two rows usually curving dorsocephalad, third row more 
obliquely backward; setae rubbed from the specimens but appearing to 
number 6—4—6 in the rows; lateral carinae with three more setae on 
dorsal surface projecting somewhat outward beyond lateral margin. 
