404 R. I. POCOCK 



Length up to about 150 mm. 



Locality, Rangoon (Fea and Gates); Tikekyee and Palon in 

 Pegu (Fea). 



At Moulmein Mr. Gates obtained several example of what 

 appear to be the same species, only a slight difference of co- 

 lour being observable. In these the hinder border of the tergites 

 is widely ferruginous or fulvous and the posterior half of the 

 anal tergite and the upper half of the valves is markedly flavous. 

 This species is very evidently closely allied to Spirostreptus 

 lankaensis of Humbert (Mem. Soc. Phys. Geneve XVIII, pt. I, 

 pp. 50-52, pi. IV, fig. 21) described from Trincomalee in Ceylon. 

 Sp. lankaensis^ however has fewer segments (59-61), is of smaller 

 size (88-100 mm. in length) , has the first tergite apparently 

 unmodified in the male and the protrusible lamina of the copu- 

 latory foot totally differently formed. 



"21. Spirostreptus oatesii, sp. n. 



Colour, head and first tergite piceo-castaneous , the tergite^ 

 greyish or pale olivaceous in front, posteriorly ringed with cas- 

 taneous or ferruginous; legs and antennae ferruginous and more 

 or less infuscate ; upper half of the anal somite and valves 

 ochraceous or brunneous. 9 Body slender and long, narrowed 

 behind the head. Head smooth above, with faint frontal sulcus, 

 irregularly striate in its lower half. Eyes internally acutely 

 angled, separated by a distance which is a little greater than 

 a diameter. Antetmae short about as long as the head. First 

 tergite much narrowed laterally, the anterior angle rounded and 

 obtuse , the posterior also rounded but nearly a right angle , 

 with a marginal sulcus and four strong complete ridges. The 

 rest of the tergites with a strong complete transverse sulcus , 

 the area in front of the sulcus nearly smooth transversely strio- 

 late, the area behind it smooth or only lightly sculptured above, 

 laterally striate up to the pore. Pores conspicuous behind the 

 sulcus. Ventral grooves short. Sterna smooth. Anal tergite produ- 

 ced into a short, straight process which slightly overlaps the 



