222 Mr. R. I. Pocock on new 



generic value, will be found in the description of the single 

 species of which the genus is composed. 



This genus is evidently related to Scolopendra, Cormo- 

 cephalus, and Cupipes. From all, however, it may be recog- 

 nized by the structure of the head and its relations with the 

 first tergite. It further differs from Cupipes in the structure 

 of its stigmata, and from Cormocephalus in the arrangement 

 of the spines on the anal femora and in the size of the claw 

 of the anal leg. In the structure of its head and first tergite 

 it comes near Asanada ; but this last genus may be at once 

 detected by its smooth and almost covered anal pleune. 



Arthrorhahdus formosus, sp. n. (PI. V. figs. 1-1 d.) 



Body robust and parallel-sided. 



Colour olivaceous, sometimes rufescent posteriorly; antenna3 

 deep blue-green. 



Head-plate punctured, not sulcate either longitudinally or 

 transversely. 



Antennae short, attenuate, composed of seventeen segments, 

 whereof the basal five are bare and the rest pubescent. 



Maxillary sternite feebly sulcate anteriorly, punctured, the 

 prosternal plates longer than wide, wider distally than proxi- 

 mally, each bearing four distinct teeth, of which the external 

 one is more distinct than the three internal ones ; basal tooth 

 long, sharp, subdentate, on a level with the prosternal plates. 



Tergites. — The first not overlapping the head-plate (the 

 basal plate being visible), not sulcate, the second feebly 

 sulcate, the third to the twentieth strongly bisulcate, all with 

 simple margins, the twentieth only showing faint signs of 

 having raised margins. 



Sternites bisulcate, with a median abbreviated impression. 



Anal somite. — Tergite with a faint median sulcus and raised 

 lateral margins ; pleurae narrow, closely porous, the process 

 very small, conical, and tipped with two minute spines ; 

 sternite longer than wide, nearly parallel-sided, with rounded 

 posterior angles; legs short and stout; femur flat internally, 

 with one strong spine on its upper inner edge, two on its under 

 inner edge, one on the postero-inferior edge of the inner 

 surface, and sometimes one or two minute spines on the infe- 

 rior surface, the process is large, conical, and tipped with 

 two spines ; first tarsal segment anteriorly excavated beneath ; 

 the claw long, longer than the first tarsal segment, strong, 

 carinate and serrate beneath, not spurred. 



Legs terminated by strong and strongly bicalcarate claws, 

 the proximal tarsal segment of all (except of the twentieth 



