chamberlin: myriopoda of the Australian region. 51 



General color above dilute ferruginous anteriorly, becoming more fulvous 

 caudad. Head and prosternum deeper ferruginous. Legs fulvous. An- 

 tennae pale ferruginous. 



Head broad, only a little longer than wide (5:4.5), subquadrate in general 

 outline but widest near frontal suture from where it narrows moderately to 

 the rounded caudal corners; caudal margin long, straight or slightly incurved. 

 Frontal suture distinct. Antennae long, attenuated, last article shorter than 

 the two preceding together. 



Basal plate covered in front by the cephaUc plate, broad, the exposed part 

 more than five times wider than long. 



Claws of prehensors when closed extending but little beyond the front 

 margin of head, to near middle of first antennal article. Prehensors heavy. 

 Claws unarmed. Femuroid with a blunt tooth at distal end within. 



Anterior edge of prosternum presenting two chitinous margins but without 

 true teeth or processes. Exposed part of prosternum decidedly wider than 

 long (5:4). 



Lateral pieces of labrum meeting at middle, apparently extending if not 

 actually united with the median piece, pectinate, the prehensors long and fine; 

 median piece or region more chitinous, darker, armed with nine stout teeth. 



Coxae of first maxillae united; inner and outer processes united, the latter 

 biarticulate with the second article much longer than the first; no lappets 

 present. 



Second maxillae with coxae fused, of geophiloid form. 



Ventral pores numerous and fine; in a transverse area behind middle, this 

 band widest at middle and narrowing laterad on each side. 



First spiracle very large, vertically subelliptic, somewhat narrower ventrally; 

 those following of similar form, large but decreasing gradually caudad, in 

 posterior region becoming small and circular. 



Dorsal plates bisulcate and with a finer median sulcus between the other two. 



Last ventral plate long, narrow, narrowed caudad, sides and caudal margin 

 straight. Coxopleurae with numerous small pores over entire surface above 

 and below, but absent from caudal region of sides. 



Anal legs composed of sLx articles distad of the coxopleurae; claw small; 

 hairs of ventral surface fine and very short. 



Pairs of legs, sixty-nine. 



Length, 60 mm., evidently much shortened owing to preservation. 



Pachymerellus, gen. nov. 



Form of head and prehensors much as in Geophilus. Ch^peal area lacking 

 as in Insignoporus; but clypeus in general ■v\^th strongly marked polygonal 

 areas. Claw and femuroid of prehensors armed. Prosternum also armed; 

 with well-developed chitinous Hnes. Labrum tripartite with the median 

 piece large, more strongly chitinous than lateral pieces, bearing numerous 



