80 Mr. R. V. Chamberlin on new 
non-porigerovs segments but thick on the others. Meta- 
zonites from the fourth to the eighteenth with a transverse 
sulcus, but none with a longitudinal sulcus. 
Cauda extending well beyond valves, slightly depressed, 
distally truncate, Anal valves mesally narrowly but sharply 
margined. 
In the male the process of fifth sternite thick, subeylin- 
drical, with distal surface oblique and its anterior edge 
mesally weakly emarginate or notched. Primary division 
of telopodite of gonopod beginning near or proximad of 
beginning of length ; the seminiferous and other division 
twisted about each other and the latter distally bifureate, 
the branches slender blades curving beneath the end of the 
seminiferous division. 
Length of males to about 19mm. ; width 155mm. The 
females much stouter, up to 2°5 mm. in width. 
Localities.—Philippines: Mt. Makiling, Mindanao, Butuan 
(C. F. Baker). 
Type, Mus. Comp. Zool. (Nos. 4651); paratypes (Nos. 4652 
& 4653). 
Prionopeltis kathanus, sp. n. 
Above deep chocolate-brown to black, shining; the keels 
yellow. Lower part of sides and venter more brownish, 
sometimes of a slight reddish tinge. Legs and antenne 
brown. 
Antenne slender, of moderate length. Head smooth and 
shining: a few sete below level of antennz ; vertigial 
sulcus sharply impressed down to level of antennal sockets, 
Dorsum strongly arched, the keels depressed so as to 
continue nearly the same curvature. Transverse sulci dis- 
tinct from the fifth segment, caudad. Posterior corners of 
all keels angular, those from second caudad, more and more 
acute than a right angle, but the processes of eighteenth 
plate narrowly rounded, while the keels of the nineteenth 
are greatly reduced. All keels strongly margined; the 
porigerous ones much more thickened than the others. 
Surface appearing smooth and shining, but under lens seen 
to be coriariously finely roughened. Pleural keels below on 
auterior segments ; these low, not produced. 
Cauda slender. Valves with mesal margins set off by a 
sulcus and strongly elevated. Anal sternite triangular ; 
the anterior side convex, each lateral one more weakly so; a 
transverse sulcus behind anterior border; the setigerous 
tubercles considcrably removed from the caudal margin, 
