DIPLOPODA. 405 
spines on the thickened part just below the curvature, two longer 
ones on the inner side, and one short one onthe outer side. In 
A. concolor also the process on the sternum of the sixth segment is 
broader, with the median apical lobe more widely rounded. 
Length, 24 mm. ; width, 6 mm. 
Locality. 29.3.95. 
The two species here under discussion certainly differ from the 
type A. stelizfer, COOK (Proc. U. S. Mus. xviii. p. 86), from the 
Tana River, East Africa, in being much smaller, the latter being 
sixty-five millimetres long, while covéortus is twenty-five; the form 
of the copulatory feet is also certainly different, and I do not notice 
in either species the tubercles on the legs that Cook has figured. 
GENUS ODONTOPYGE, BRANDT. 
Representatives of two species of this genus were obtained at 
Darde River, in Somaliland, and 5.6.95; but since a single female 
only was acquired at each locality, it is hardly possible either to 
identify or give a satisfactory diagnosis of them. 
Archispirostreptus phillipsit, Poc. 
Ann. Mag. Nat. Hist. (6), xviii. p. 187, Pl. XI. fig. 5. 
Locality. River ‘Web, running into the River Jub. 
A single male example of this species, recorded originally from 
the Goolis Range, inland of Berbera, Somaliland, was procured. 
Archispirostreptus dodsoni, sp. n. 
&. Color (in alcohol): posterior half of segments behind the 
groove deep blackish-brown, the anterior part yellowish-red, legs 
and antenne also deep olive-brown ; lower half of face suffused 
with reddish-brown. 
Head nearly smooth above and between the antennae, the frontal 
sulcus conspicuous, traces of a fine interocular groove ; the lower 
portion of the face above the labrum punctured and striate. Eyes 
composed of about sixty ocelli arranged in six longitudinal and 
twelve vertical rows; antenne with their basal four segments nearly 
equal to the length of the face. First tergite expanded laterally, with 
anterior angle a little produced, crossed by about six weak longer 
and shorter sulci. The rest of the segments, with the posterior 
