1896.] Entomology. 843 
Head smooth and shining, sparsely hirsute distad. 
Eyes of a single ocellus on each side, large and strongly pigmented. 
Antenne sparsely hirsute, strongly crassate, scarcely clavate ; joints 
increasing in length from the first to the sixth. 
Hypostoma distinct, medianly deeply excavate. 
Mentum distinct, on each side a large cardo (?). Other parts of 
gnathochilarium indistinct; the lines of the figures may represent 
internal structures only. 
First segment longer than the others, which increase in length to the 
middle of the body and are scarcely shorter caudad ; surface of all the 
segments smooth and shining. 
Repugnatorial pores in a continuous series from the fifth segment, 
removed considerably from the margin of the scuta, except those of the 
fifth segment, which are also distinctly larger than the others. 
Pleurz large and entirely free, smooth and shining. 
Pedigerous laminæ distinct, free ; sometimes the edges of the pediger-. 
ous lamin and the pleurz lie one upon the other. 
Penultimate segment without legs, in contact or overlapping, but not 
closed below. 
Anal valves narrow; preanal scale wanting. 
Legs sparsely hirsute, all six-jointed, with a rudimentary se@ond 
_ joint which would make seven. 
Males with a conic process from the coxæ of the second legs. All 
the other legs except the first have a coxal aperture from which pro- 
jects a transparent membrane or secretion. 
Male genitalia, see figures. 
Color of living animals, pinkish, pale to dull reddish-pink. 
Length of mature individuals up to 15 mm., width .75 mm. ; segments 
of adults 89-55. The males are distinctly smaller than the females. 
The young male specimen from which fig. 15 was drawn has 24 segments, 
all but two of which bear legs, as in the mature animals.—O. F. Coox. 
EXPLANATION OF PLATE. 
Siphonotus africanus. 
Fig. 1. Head and first nine segments, ventral view, to show arrange- 
ment of legs. 
Fig. 2. Head and first three segments, ventral view, the legs removed 
to show pedigerous laminæ, spiracles, ete. 
Fig. 3. Head and five segments, dorsal view. 
Fig. 4. Segments 4-6, lateral view, to show the peculiarly enlarged 
pore of the fifth segment, 
