MILLIPEDS OF PANAMA—LOOMIS 121 
March 8-15, 1958, E. M. and H. F. Loomis, and female, Pifia area, 
March 18, 1958, H. F. Loomis, author’s collection. Panama, six fe- 
males, Juan Dias, June 3, 1923, O. F. Cook and H. F. Loomis, author’s 
collection. 
Dracnosis: Related to S. telana Chamberlin, based on a single 
female, but differing in the smaller size, fewer segments, stouter an- 
tennae with differently shaped joints, as compared with his illustra- 
tion, and the proportions of segment 1. 
Description: Males 5 to 12 mm. long and 0.6 to 0.8 mm. wide with 
34 to 65 (type) segments; females 7 to 15 mm. long and 0.7 to 0.8 mm. 
wide with 42 to 58 segments. 
Body with anterior end very gradually widening to segment 7 or 8; 
posterior end with sides almost parallel to penultimate segment whose 
sides narrow rapidly; dorsum rather strongly and evenly convex to 
outer edge of keels, which are not prominent, separately raised, nor 
produced backward on any segment but are represented by only a 
slight swelling from which the pore opens; dorsum with short, moder- 
ately dense setae through which the shining surface is somewhat 
evident. 
Head (fig. 8c) almost globular, beak shorter than the head, barely 
exceeding joint 4 of antennae, straight and set low, the front rising 
abruptly from it and concealing its base somewhat in vertical view; 
antennae short and stout, clavate, evenly setose, joint 6 longest and 
widest, joint 2 next in length but narrower, joint 4 shortest (fig. 8d). 
Mentum wide at base, its sides strongly convex; hypostoma not 
exposed. 
Segment 1 narrow with sides slightly thickened, the free edge 
curved inward and barely visible in lateral view. First legs somewhat 
crassate, second and third ones decreasingly so, the ones thereafter 
slender and uniform; first legs without anterior coxal lobes. 
Gonopods as shown in figure 8e-f. 
Chamberlin (1940) reported ‘‘a number of mostly immature speci- 
mens” from Barro Colorado Island to be his S. fallens, described 
from Guatemala. That species certainly is not represented in the 
present collection, and it seems much more likely that those specimens 
actually are S. aviceps. 
Siphonophora panamensis, new species 
Fiaure 8g-j 
Houoryee: Male, USNM myriapod collection 2654, Pifia area, 
Canal Zone, March 18, 1958, H. F. Loomis. 
ParatyPes: Canal Zone, many specimens from following localities: 
Barro Colorado Island, March 8-15, 1958, E. M. and H. F. Loomis; 
