chamberlin: myriopoda of the Australian region. 14.1 



widening from base to near middle of length and ilim Btrongly convexly 

 rounded into a Bemicircle which is orenate, showing ten to twelve low crena- 

 t ions bearing l<»n^ seine Valvea Btrongly margined, coarsely roughened and 

 granular. Scale also granular, caudally weakly convex, with a large setigeroua 

 tubercle at each lateral end <>f caudal border. 



Gronopoda of male with telopodite distally flattened and strongly uncate, 

 curving dorsad and then caudad and dividing into two l<»n^ prongs of which 

 the ectal is slender and acute, while I h<- mesa) one is proximally flat a ad blade- 

 like bu1 distally divided :i^:iin into two Blender acute prongs. 



Length, to near 55 nun.; width, 10. 8 mm. 



384. Platyrrhacus (Diodontodesmus) mimus, sp. dov. 



Type.— M. C. Z. 1,983. Paratypes.— M. 6. Z. 4,984. Solo- 

 mons: Pulakora (W. M. Maim). 



In the form of the gonopods much like P. verrucosus (Pocock); 

 but the erect distal process is proportionately longer and more ungu- 

 late proximally, while the curving transverse prong, though very 

 similar, takes its origin more dorsad and mesad than represented 

 for verrucosus. 



It is a notably smaller species than P. verrucosus, the male having a 

 width of only 5.2 mm. as against 9 mm. in the other species. The 

 dorsum is hut little arched, in this contrasting strongly, e. g., with 

 gonethus, being more of the Polydesmus form. The keels typically 

 weakly protruding only at ends, the intervening region merely con- 

 cave or in some with one weak rounded tooth or angle or sometimes 

 more. The pore is on the oblique surface at the lateral border less 

 than its diameter from the edge. On posterior plates the three rows 

 of tubercles are distinct and subequal but on anterior plates the middle 

 one may be more w r eakly developed and sometimes almost obliterated. 



Head strongly tuberculate throughout. Antennae heavy. 



Color deep brown, prozonites somewhat paler; lateral borders of 

 keels light brown to obscure fulvous. 



385. Platyrrhacus gonethus, sp. now 



Type — M. C. Z. 4,981. Paratypes.— M. C. Z. 4,982. Solo- 

 mons: Fulakora (W. M. Mann). 



General color dark brown with extreme lateral edges of keels narrowly 

 yellowish or the lighter color sometimes not evident; prozonites of same color 

 as metazonites or a lighter brown, in immature specimens often whitish. 



