118 PROCEEDINGS OF THE NATIONAL MUSEUM VOL, 118 
Family Siphonophoridae 
Genus Siphonocybe Pocock 
Siphonocybe Pocock, Biologia Centrali-Americana, Diplopoda, p. 50, 1903. 
With the study entailed by the finding of another species of Szpho- 
nocybe some doubt arises as to the justification for maintaining the 
genus as distinct from Siphonophora. While the anterior gonopods 
of the three Siphonocybe species, here illustrated, are of a single type, 
this form is not greatly different from one found in some species 
of Siphonophora, and the posterior gonopods of all species, where 
known, appear to show no generic differences and rather minor specific 
ones. Hence, the principal character remaining on which Siphonocybe 
may be maintained is the large keels, caudally produced on at least 
the posterior segments. This character probably should be considered 
of subgeneric rather than generic value in the classification; however, 
until our knowledge of the various species of Siphonophora becomes 
greater no advantage is seen in changing the present status of Siphono- 
cybe. 
Siphonocybe pilosa, new species 
FIGuRreE 7i-—m 
Hototyre: Male, USNM myriapod collection 2652, Fort Sherman, 
Canal Zone, April 20, 1925, O. F. Cook. 
AutotyPE: Female, USNM, same collection data as for holotype. 
ParatypsEs: 4 males, 1 female, author’s collection, same collection 
data as for holotype; female, Pifia area, Canal Zone, March 18, 1958, 
H. F. Loomis, and 2 females, Cerro Campana, Panama, March 16, 
1958, G. B. Fairchild and H. F. Loomis, author’s collection. 
Diacnosis: Most closely related to S. harti, as indicated by its 
body shape, dense pilosity, and color but differing in shape of head 
and first segment and in the more inflated keels. 
Description: Body of intermediate length but stout and convex, 
tapering gradually for 7 or 8 segments at each end; females with 53 
to 75 segments; 12 to 24 mm. long, 1.2 to 1.9 mm. wide; males with 52 
to 70 segments; 14 to 22 mm. long, 1.3 to 1.6 mm. wide; color in al- 
cohol rusty brown; dorsum densely beset with long setae, the surface 
scarcely showing through. 
Head (fig. 77) campanulate, beak slightly deflexed and composing 
two-fifths its length, reaching to middle of antennal joint 6; mentum 
with sides straight, diverging evenly from in front (fig. 77), hypostoma 
completely hidden; antennae short, stout, increasing in thickness to 
joint 5 with joint 6 slightly narrower but longer than joints 4 and 5 
together, joint 4 shortest. 
