82 Mr. R. VY. Chamberlin on new 
closely applied to the other proximad of the distal bend. 
Each telopodite as a whole bowed ectad, bending in distally 
to median line. 
Length (female) to about 40 mm. ; width to 4°8 mm. 
Localities.—Philippines : Luzon, Mt. Makiling; Las 
Banos. 
Type, Mus. Comp. Zool. (No. 4663); paratypes (Nos. 
4664 & 4665). 
Platyrrhacide. 
Platyrrhacus simplex, sp. n. 
Keels brown, with the dorsum between them black ; pro- 
zonites above blackish across their caudal region, in front 
and laterally brown, fulvous beneath. Anal scutum brown, 
excepting at base, where black. Head brown. Legs and 
antennee light brown or fulvous. 
Antenne short. Head about antennal sockets and over 
entire region above them finely tuberculate or granular, the 
granules not crowded. Vertigial furrow present, this widest 
and deepest at lower end. 
Collum as wide as head, inclusive of mandibles. Widest 
a little in front of middle, the lateral margin on front side 
of the lateral angle convex, that behind concave, Depressed 
caudad of anterior border, the latter bearing a transverse 
row of large tubercles. A row of tubercles also along 
caudal border. The surface in general densely granular, with 
some larger scattered tubercles which are scarcely serrate. 
Second tergite obviously wider than the adjacent ones, the 
keels extending out beyoud and below the others. Lateral 
end narrow, rounded, the margin wavy, showing three low 
crenations between those at the corners. ‘The lateral margin 
of third keel also with three undulations, that of fourth 
one and that of immediately following ones with two more 
or less clearly discernible. In the posterior region the 
erenulations become more elevated and distinct, and may rise 
to four or five in number. Anterior side of keels angularly 
shouldered at proximal end ; edge straight or slightly con- 
cave, weakly serrate, the border crossed by numerous 
longitudinal sulci. Caudal margin of keels straight or 
slightly concave, also obscurely toothed, the outer corner 
slightly extended caudad. Dorsal surface of tergites strongly 
granular out to the edges of the keels, with three rows of 
tubercles, of which the caudal row is distinct at the sides, 
but is across the mid-dorsal region obscure or obliterated, 
while the other rows are distinct entirely across. 
