74 Mr. R. V. Chamberlin on new 
Head smooth. * Sulcus not evident in vertigial and frontal 
regions, a short one present above labral edge. Eyes small, 
fully twice their diameter apart. 
Collum of ordinary form. 
The pores are a little distance removed from the sutures, 
the latter being straight opposite pores and distinct. 
Longitudinal striz: across metazonites below and up the 
side part-way to the pore, the striz crossing the front of 
the suture but little, there oblique; the prozonites mostly 
smooth, excepting that on some anterior segments there are 
above short wavy striolations and some longer transverse 
ones. A series of small curved marks and puncte along 
suture above. Some weak longitudinal ruge above. 
Anal scutum equalling the valves, without special 
markings. Valves margined, the elevated mesal rim low 
aud narrow, though sharply set off. 
Median plate of anterior gonopods with distal part tri- 
angular, acutely pointed, each side convex proximally and 
somewhat concave distally; proximal arms widely diverging, 
curving out about bases of gonopods. Coxal plates of first 
gonopods rising distad to an angle on mesal side ; much 
exceeded by the telepodite, which is broad across distal 
end, with the thickened mesal ridge extending distad but 
little beyond the principal part. 
Number of segments fifty-three. 
Width (male) 2°5 mm. 
Locality.—Philippines : Mindanao, Butuan (C. F. Baker). 
Type, Mus. Comp. Zool. (No. 4788). 
Plokamostrophus luzonianus, sp. 0. 
Greatly exceeding the preceding species, mindanaonus, in 
size, and differing conspicuously in the details of the 
gonopods. 
General colour black, the caudal edges of segments 
reddish and the covered part of prozonites light brewn to 
fulvous. Lower part of face, antenne, and legs ferru- 
gious, 
Suleus of head distinct above and below. Eyes sub- 
triangular, the meso-ventral edge convex, the caudal and 
the antero-ectal sides straight, the outer angle rounded. 
Foveole 2+ 2. 
Collum nearly of same form as in 7. lumbricinus, with 
a longitudinal stria similarly at level of eye. 
Segments constricted moderately along position of suture. 
Suture not present dorsally. Striz across metazonite below 
