ARACHNID A AND MYRIOPODA. 183 



spines along the lower surface. The copulatory feet with the 

 anterior piece narrowed below, marked by two deep grooves 

 separated by a keel, terminating inferiorly in a smooth rounded 

 prominence, the posterior piece terminating below in a pro- 

 minence which is somewhat similar, but pointed below. The 

 appendage consists of two pieces, a shorter, straight, simple 

 pointed style, and a long curved flagellum, which is expanded 

 mesially, pointed and simple at the end, but which gives off a 

 short, simple, slender, curved process at the distal end of the 

 expanded part of its length. 



Number of somites 70. 



Length about 200 millim. (about 8 English inches). 



Two male specimens were obtained. 



This handsome species is very closely allied to Sp. heros of 

 Porath from Caffraria. The two, however, appear to differ 

 slightly, at least in colour, arid Sp. heros, according to the 

 description, bears no secondary process on the flagellum of the 

 appendage of the copulatory feet. (R. I. P.) 



Spirostreptus (Odontopyge) pretoria, sp. n. Pretoria. 



Colour : head fuscous above, ferruginous beneath the line of 

 the antennae ; antennae with the first, second, third, and fourth 

 segments ferruginous, the fifth fuscous distally, the sixth wholly 

 fuscous ; the first tergite deep slate-grey, with its anterior and 

 posterior margins flavous; the rest of the somites with the 

 posterior border widely flavous ; the middle part of the somite 

 slate-grey, laterally fading above and below into a paler ferru- 

 ginous grey ; anal somite wholly fuscous ; legs ferruginous. 



Head almost smooth above, finely punctulate, with a feeble 

 sulcus, rugose and punctured on the labral region. Eyes 

 widely separated, triangular, each consisting of about 50 ocelli. 

 First tergite almost entirely smooth, the lateral portion sub- 

 rectangular, with an anterior marginal sulcus and a second 

 sulcus running from above the anterior angle to the posterior 

 angle. The rest of the somites marked with a complete and 

 strong transverse sulcus, the area behind this sulcus weakly 

 longitudinally sulcate below ; the whole of the upper surface 

 very finely and closely rugulose, being marked with minute 



