chamberlin: myriopoda of the Australian region. 143 



of keels typically fulvous. In one female the prozonites arc nearly uniform 

 in color and the lateral borders of keels are not hghter. 



Surface of head uneven, most of it strongly granulotubercular, the granula- 

 tions becoming finer toward clypeal region the lower part of which is smooth. 

 Antennae moderately slender, uniform, light colored. 



Dorsum more moderately arched, much less strongly than in P. gonethus 

 but more strongly than in vdmus. Three rows of tubercles on tergites dis- 

 tinct, the tubercles moderate or small in size, rounded, widely separated; on 

 some plates the tubercles of median and anterior row are smaller in the mid- 

 dorsal region. The very large pores are very characteristic, each situated on 

 the border slope of keel about its radius or but little more from the edge. 

 Lateral teeth of keels uniform, usually three between corner ones, on some 

 four and sometimes, in the posterior region, five. 



Length (male type), near 55 mm.; width, 5.5 mm. 



Most easily distinguished by the form of the gonopods of the male 

 which are of the type with more than tw-o distal branches. The gono- 

 pod curves up dorsally and back proximally as in P. gonethus, etc. 

 On the ectal side at the beginning of the curve are two processes, a 

 proximal one bending back proximad in a hook and a more slender 

 straight one running dorsoectad and slightly cephalad. The main 

 prong divides into two proximally directed, acutely pointed, processes 

 of which the mesal one is larger and more curved. 



387. Platyrrhacus schistogon, sp. nov. 



Type.— M. C. Z. 4,987. Paratypes.— M. C. Z. 4,990. Solo- 

 mons: interior of Malaita, Atta, Auki (W. M. Mann). 



Most like P. fallens in the character of the male gonopods. There 

 are similarly two processes from ectal side but these arise farther up 

 on the curve and are more separated at base with both running proxi- 

 mad and the more proximal one but little more cur^'ing than the other. 

 The principal prong bifurcates distally as in the other species into two 

 curved branches of which the mesal is stouter and longer; but unlike 

 the other species there springs from near the base of these t\vo branches 

 a third process which appears as a straight slender spur that runs ectad. 



The color is black excepting the lateral borders of keels which, with 

 the legs and antennae, are yellow. 



As in the preceding species the posterior row of dorsal tubercles 

 are better and more uniformly developed than the others. The pores 

 are obviously much smaller and are removed from the lateral edge by 

 somewhat more than their diameter. Lateral margin of keel normally 



