MILLIPEDS OF PANAMA—LOOMIS 119 
Segment 1 broad (fig. 7k), its outer limits greatly thickened and 
very convex, being almost hemispherical with the free lateral edge so 
greatly curved under body that it is not visible in side view but only 
from below. 
Ensuing segments with dorsum strongly convex; keels rising slight- 
ly on each side, strongly swollen, with sides continuing the same 
convex curve below pores; keels near caudal end of body more ele- 
vated and slightly produced backward beyond posterior border of 
segments. First pair of legs lacking coxal lobes, not noticeably 
heavier than those immediately following but the first seven or eight 
pairs a little heavier than those thereafter. 
Gonopods as shown in figure 7/—m. 
Siphonocybe alba Loomis 
FIGuRE 84 
Siphonocybe alba Loomis, Bull. Mus. Comp. Zool., vol. 80, No. 1, pp. 18-14, 1936. 
Smaller and more slender than the other two species. Segment 
1 descending as in S. harti, with the lateral margin exposed from the 
side, broadly rounded and nearly twice as long as segment 2. An- 
terior gonopod as in figure 8a. 
Siphonocybe harti (Pocock) 
FiaureE 8b 
Siphonorhinus harti Pocock, Ann. Mag. Nat. Hist., ser. 6, vol. 15, p. 375, 1895. 
Siphonocybe harti Pocock, Biologia Centrali-Americana, Zoologia, Chilopoda and 
Diplopoda, p. 50, 1903. 
In direct comparison with S. pilosa the head is much more rounded 
and each side of segment 1 is not greatly inflated but descends almost 
vertically inward with the free lateral margin fully exposed from the 
side, rounded, and no longer than the lateral margin of segment 2. 
Keels not as inflated as in S. pilosa, the sides below them much less 
convex but more keels are caudally produced. Anterior gonopod as 
in figure 8b. 
Genus Siphonophora Brandt 
Siphonophora Brandt, Bull. Sci. Acad. Imp. Sci, Saint Pétersbourg, vol. 1, No. 23, 
p. 179, 1836. 
Siphonophora aviceps, new species 
Ficure 8c-f 
Houotyre: Male, USNM myriapod collection 2653, Barro Colorado 
Island, Canal Zone, May, 1956, C. W. and M. E. Rettenmeyer. 
ParatyPsEs: Male, female, Snow Museum, same collection data as 
for holotype. Canal Zone, 7 males, 8 females, Barro Colorado Island, 
