558 MR. R. I. POCOCK ON THE AUACHNIDA, [DeC. 4, 



This species may be recognized inter alia by its cylindrical an- 

 tennal segments, and by the absence of denticles upon the under 

 surface of the tibial and proximal tarsal segments of the anal legs. 



GfiOPHILIDJi. 



Mecistocephalus castaneiceps (Haase). 



Mecistocephalus castaneiceps, Haase, Die Indisch-Australischen 

 Myriopoden, pt. i. Chilopoden, p. 102, pi. vi. fig. 109. 



Six specimens were taken under stones in Flying-Fish Cove. 



This species has hitherto only been recorded from Pulo Edam, an 

 island on tlie north coast of Java. 



DIPLOPODA. 



POLYDESMID^. 



Cylindrodesmus, gen. nov. 



Genus generi Strongylosoma affitie ; eo discrepans quod foramina 

 repugnatoria, absentibus carinis lateralibus, in segmentorum 

 superficie situm habent ; lahro ad speciem ferme quadratce 

 lamincB ex anteriore capitis margine prominentis conformato. 



For other characters see under the specific diagnosis. 



Cylindrodesmus hirstjtus, sp. n. (Fig. 2, p. 559.) 



Colour ochraceous or testaceous. Head-plate remarkably convex 

 in its upper portion and cleft by a longitudinal median sulcus, which 

 terminates before reaching the interantennal space. This space 

 very narrovr. Externally to the point of insertion of each antenna 

 the iiead-jjlate is somewhat deeply excavated, to form a groove, which 

 is bonnded on the inner side just above the proximal joint of the 

 antenna by a rounded prominence, and on the outer side l)y a con- 

 spicuous ridge which, sharply defined above, merges insensibly with 

 the rest of the head-plate below, and. is continuous with the external 

 margin. Beneath the interantennal space the head-plnte presents 

 a sliallow transverse constriction. The labrum is remarkably promi- 

 nent and projects as a somewhat quadrate prolongation from the 

 lower portion of the head-plate, its lateral margins cutting the lateral 

 margins of the head-plate at about an angle of 135°. Its anterior 

 margin is almost straight and feebly toothed, in the middle, and its 

 antero-lateral angles rounded. Head-piate thickly clothed with 

 short hairs and closely but obscurely punctured. 



Antennce short and hairy ; segments 2, 3, 4, 5, proximally nar- 

 rowed, about equal in length and somewhat cup-shaped ; sixth 

 segment much larger and more cylindrical than those that precede 

 it ; seventh segment cylindrical, small, but conspicuous. 



Tergites not shining, dull, rugulose, thickly clothed with short 

 hairs and sparsely with longer hairs : first with simple margins 

 and rounded lateral angles ; second widened inferiorly on each side ; 

 hinder half of each of the other somites above evenly arched from 



