330 Mr. II. V. Chamberlin on new 



longer than in celehensis ; teeth in number near forty-three 

 to forty-five. The abdental edge of the ordinary lamella; 

 has a characteristic obtuse -angulation near base (PL X. 

 fig. 5). 



Maxillae resembling those of celebensis ; but posterior 

 processes of coxosternum of second pair less acute, more 

 rounded, slightly bending mesad at caudal end, the seg- 

 mental pore triangular in outline, a more chitinous median 

 band separated off from the lateral areas. Coxse of first 

 raaxillse with ectal angles scarcely produced, subrectangular 

 (PI. X. fig. 3). 



Presternum with teeth of anterior margin well-developed. 

 Femuroid with two teeth, which are subacute and of which 

 the second or more distal is characteristically much stouter 

 and longer, this being a feature by which the species is 

 ordinarily readily recognizable. Next two joints also 

 armed, the tooth of the second the larger. Claw with a 

 distinct tooth at base above the ordinary prominence 

 (PI. X. fig. 6). 



Second legs twice as long as the first. 



Impressions of anterior sternites furcate, the angle obtuse, 

 the angle rather more obtuse in the more posterior of the 

 furcate ones (PI. X. figs. 7 & 8). 



Sternite of pregenital segment trapeziform, the sides 

 moderately converging caudad, and the plate typically 

 aljruptiy much narrowed near caudal end (PI. IX. fig. 11). 

 Coxopleurse with very numerous small and xqyj small pores, 

 the smaller ones much the more numerous. Ultimate legs 

 about two and a fourth times as long as the penult. 



Number of pairs of legs, 49. 



Length 88 mm. ; width of first tergite 3"2 mm. 



Locality. — Philippine Is.: Luzon: Los Baiios ; Mt. 

 Makeling (C. F. Baker coll.). Types and paratypcs in 

 Mus. Comp. Zool. Cambridge, ]\Iass. 



This seems to be a common species about Los Banos. 



Mecistocephalus nagasaunus, sj). n. 

 (PL X. figs. 9-11 ; PL XI. figs. 1-4.) 



Colour in general fulvous, more orange-coloured an- 

 teriorly. Head and prehensorial segment dark orange or 

 light chestnut. 



Head much broadest anteriorly, conspicuously narrowed 

 caudad. Anterior margin obtusely angular, notched at 

 middle. Posterior margin wide, very slightly convex or 

 essentially truncate. Head 1'6 times longer than wide 



