Chilopods of the Genus Mecistoceplialus. 333 



This is a strongly marked species, readily recoguizable by 

 the bluntly rounded distal joint of tlie palpus of the second 

 maxilke, the form of the labrum, slender claw of the pre- 

 hensors, with absence of tooth from third joint of latter, etc. 



Mecistocephalus aputor, sp. n. 

 (PI. XII. figs. 1-6.) 



Head and prehensors blackish. Body fulvouSj orange in 

 anterior region. 



Head diti'ering considerably in form from that of monti- 

 cole7is, which tiie species resemljles, being anteriorly truncate, 

 more gradually narrowed caudad. Posterior margin trun- 

 cate. Head 1"85 times longer than wide. 



The setse of the clypeal region are }iiniilar in number and 

 position to those of monticulens, as these are shown in 

 PI. XII. fig. 8. The subhiteral spurs are stouter and less 

 bent mesad. 



Labrum somewhat siuiiiur in general form to that of the 

 Javan moiUico/ens ; but the exposed part of the median piece 

 has the sides straight or concave instead of convex, and the 

 free margins of the lateral pieces round in cephalad at mesal 

 ends instead of projecting in tooth-like angles (PI. XII. 

 fig. 2; c/. PI. XII. Hg. 9). 



Mandible with a total of seven lamellae. Of these the 

 first has six stouter teeth (I'l. XII. fig. 4). A median 

 lamella has twelve long teeth, these subuniform in length. 



The areolated region of the coxosternum of the second 

 maxilke large, the median l)aud broad ; but in this species 

 the non-areolated region on each side extends caudad of the 

 segmental pores. Kctul angles of coxte of first maxilla; 

 moderately produced forwards (PI. XII. fig. 3). 



The teeth of the prosternum aie small though diNtiuct 

 and larger than in munticolens. The two normal teeth of 

 i'emuroid present. Of these the more proximal one is low, 

 broad, and rounded ; the distal one is longer and is distally 

 subnuncate. The next two joints also armed, llie tooth of 

 the second one the larger. No distinct tooth at base of claw 

 al)Ove the basal angulation (PI, XII. tig. 5), 



Sternal impressions simple longitudinal furrows, with lu) 

 distinct furcation. 



Sternite (if pregenital segment trapezilurm, strongly 

 narrowed caudad. ('oxopleural [jores ot incxlcrate size, well 

 sc|)arated, about twenty-five on each side. 



Pairs of legs, 49. 



