Chilopods of the Genus Mecistocephalus. 329 



First legs exceptionally small, the second being two and 

 two-thirds longer. 



Impressions of anterior sternites furcate, the angle be- 

 tween branches obtuse, becoming more so in going caudad, 

 the two branches in some forming nearly a straight line, 

 disappearing in posterior region as usual (cf. PI. IX. 

 figs. 8 &9). 



Pregenital segment with sternite somewhat shield-shaped, 

 narrowed in front of caudal end. Coxopleurse with 

 numerous small pores uniformly arranged, less numerous 

 minute ones intervening. Last legs about two and a fourth 

 times as long as the penult ones. 



Number of segments, 49. 



Length, to 60 mm. ; width of first tergite 3 mm. 



Locality.— Celebes : Bua-Kraeng, 5000 ft. (Friiltstorfer, 

 Feb. 1896). Type and paratypes in U.S. National Museum; 

 paratypes also in Mus. Comp. Zool. at Cambridge, Mass. 



Mecistocephalus philippinus, sp. u. 

 (PI. IX. fig. 11; PI. X. figs. 1-8.) 



Colour brown, darkened by a dense network or marbling 

 of black, which is also evident in the pleural region and less 

 pronouncedly on the sternites. Head with antennae and 

 prehensorial segment chestnut. Legs fulvous. 



Head proportionately broader than in celebensis and cepha- 

 lotes, being 1*6 times longer than wide. The anterior 

 margin is weakly bowed forward, less nearly truncate than 

 in celebensis and less produced than in cephalotes. The sub- 

 lateral teeth or spurs are farther forward than usual (PI. X. 

 fig. 1). 



Antennae strongly attenuated, the articles proportionately 

 rather broad, the sixth being typically as broad distally as 

 the length. Ultimate article decidedly longer than the 

 preceding one. 



Exposed portion of median piece of labrum conspieuously 

 narrowed caudad. Free margin of each lateral piece 

 straighter than in celebensis and cephalotes, not bending in 

 at mesal ends, as in the latter species, and with no line of 

 hairs showing at outer ends. 



Mandible with thirteen or fourteen primary lamellae. 

 First lamella with seven stout and subuniform teeth. Mesal 

 margin of mandible below this lamella with only three to 

 five weak serrations below the angle (PI. X. fig. 4). A 

 median lamella has the teeth of the distal region long and 

 slender, those of proximal half much reduced, though rather 



