Genera and Species of Millipedes. 429 
Phyodesmus vittatus, sp.n. (Fig. 3.) 
3.— Colour (dry and faded) a tolerably uniform pale 
brown, but with a distinct continuous narrow pale band 
passing along the middle of the dorsum from the first to the 
nineteenth segments. 
First tergite with its angles scarcely produced. 
Body not so wide anteriorly as in the preceding two species, 
the fifth segment being only a little narrower than those 
situated more posteriorly ; the keels more elevated from the 
base and the whole of the dorsal surface more coarsely 
granular; lateral margins of keels dentate from the fifth 
backwards ; the teeth from two to four in number, not including 
the anterior and posterior angles. Pore about two diameters 
from the edge on the fifth and seventh segments ; about one 
or less from the adjacent notch on the posterior segments. 
Sternal spines much longer than in the preceding two species. 
Copulatory foot (as in fig. 3) long, straightish, ending in two 
unequal prongs, the longer strongly curved and slender, the 
shorter more laminate and abruptly hooked. 
Measurements in millimetres.—Total length 93 (at least) ; 
width of second segment 13°8, of fifth 15, of twelfth 14°3. 
Loc. Borneo (H.M.S. ‘ Samarang’). 
This species belongs doubtfully to the genus Phyodesmus, 
being apparently more coarsely granular than the type 
(P. pictus, Peters), with the anterior angles of the first tergite 
not produced to anything like the same extent. Hither of 
the other species here referred to Phyodesmus may prove to 
be identical with pictus, Pet., Petersi?, Cook, or montrado, 
Cook, which have not yet been satisfactorily diagnosed. 
Phyodesmus areatus, sp. 1. 
?.—Colour (dry and faded specimen) greyish brown; 
cylindrical half of segments blackish above, with a median 
pale band; keel-bearing portion paler in the middle, with 
three blotches in front on each side, also some brown spots 
posteriorly, the spots separated by whitish lines, which form 
a kind of pale network pattern. Anterior angles of first 
tergite produced. Dorsal surface of all the segments 
distinctly granular, the rows of tubercles distinct. 
Side margins of the keels from about the eighth distinctly 
dentate, but the teeth all small, about four in number not 
including the anterior and posterior angles, so that the pores 
never come close to the nearest notch, being usually separated 
by about two diameters from it; on the fifth segment the 
