chamberlin: myriopoda of the Australian region. 139 



380. Pachyurus tricuspidatus Silvestri. 



Abhandl. Mus. Dresden, 1897, 6, pt. 9, p. 14, pi. 2, fig. G9, 70.' 

 Locality. — Timor.^ 



381. Pachyurus solomonis Pocock. 

 Ann. mag. nat. hist., 1897, ser. 6, 20, p. 445.i 

 Locality. — Solomons.^ 



382. Platyrrhacus atopogon, sp. nov. 



Type. — M. C. Z. 4,677. Dutch New Guinea: Manokwari (Thomas 

 Barbour). 



The general color above is uniform brown over the metazonites with the 

 prozonites a deeper, blackish brown. Legs and antennae brown, paler, more 

 testaceous proximally. 



Antennae exceptionally short; the joints short, strongly clavately thickened 

 above base. Surface of head strongly granular; vertigial furrow as usual. 



The collum equalUng the head in width; widest anteriorly with the lateral 

 ends narrowly rounded. Anterior margin straight across the middle, the 

 extreme lateral portion set farther caudad than the median portion. Caudal 

 region behind lateral processes very strongly convex. Surface densely granu- 

 lar; with four transverse rows of larger, prominent rounded tubercles of which 

 those of the row across anterior border are closely arranged, while those ^f 

 the caudal and two intermediate rows are widely separated. 



Second tergite wider than those following; lateral margin of keels with 

 five teeth between those at the corners whereas the keels of the third segment 

 have but three, of the fourth two and of the following ones three again or in 

 the most posterior ones four. The teeth all angular. Pores on the obUque 

 surface close to the lateral margin from which removed by less than the 

 diameter of the ring. Surface of metazonites densely coarsely granular to the 

 edges of the keels; the tubercles of the three rows all prominent, well separated, 

 those of the caudal row largest and projecting caudad of +he posterior margin. 



The anal scutum is partly broken off; what remains, however, shows that 

 it widens in some degree caudad of the base. The valves are unusually flat- 

 tened, the mesal margining narrow and low, the two tubercles of each valve 

 large and rising above the margin; surface granular. The anal scale with 

 siu^ace granular; subtrapeziform, the caudal edge mesally scarcely obtusely 

 angular, the setigerous area large. 



The gonopods of the male are much shorter than in P. ancytogon. As in the 



