1912.] F. H. Gravely : Scolopendridae. 71 



varietal names. Great differences are also found in the size, 

 proportions, and femur-armature of the anal legs. Our Ceylon 

 specimens agree more or less perfectly with Kraepelin's description, 

 but in the Himalayan ones the number of spines on the femur 

 is commonly less and the femur as a whole is apt to be shorter ; 

 neither of these characters seems, however, to be constant nor 

 are the shortest femora necessarity those with the fewest spines. 

 This frequent reduction of the number of spines on the femora 

 brings the species still nearer to 0. scaber, Pocock, and although 

 I have never yet seen a specimen with two tarsal spurs on the 

 legs of less than about eighteen segments I cannot help think- 

 ing that the two will in course of time prove to be identical. 

 The pseudopleural processes are also subject to variation, and the 

 distinctness of the longitudinal keels, as w^ell as the presence or 

 absence of a pair of longitudinal grooves and the whole texture of 

 the dorsal surface, is extraordinarily variable. The dorsal surface 

 may be smooth and polished between the keels throughout, or 

 may be granular or linel}^ spinulose laterally^ or finely spinulose 

 throughout. 



O. rugulosus, For. 



vSadiya, N.-E. Assam, 25-xi-ii. 

 Kobo, 400 ft., 30-xi — 3-xii-ii (rotten wood). 

 Rotung, 1,300 ft., 30-xii-ii (under stones). 

 Renging, 2,150 ft., 19-xii-ii (rotten wood). 



Previously recorded only from the Seychelles, Mauritius, 

 Andamans, Burma, and Siam. There are however also specimens 

 in the Indian Museum collection which were recentl}^ collected b}'' 

 Mr. Kemp in Assam as far west as Mangaldai and the Assam- 

 Bhutan frontier north of that district. 



The extent to which the longitudinal grooves of the sterna 

 are developed varies greatly ; and in one or two of the Kobo 

 specimens they are entirely absent. 



Genus Rhysida, Wood. 

 R. nuda (Newp.). 



Dibrugarh, N.-B. Assam, 17 — 21-xi-ir. 



Sadiya, N.-E. Assam, 25-xi-ii. 



This species occurs throughout the Oriental Region and also 

 in Australia and Paraguay. The specimens from the Abor 

 country are nearer R. immarginata (Por.) than R. nuda as these 

 species are defined by Kraepelin (loc. cit., pp. 141 and 143-4), 

 but as specimens combining the characters of the two seem to 

 be far commoner in India than the latter and quite as common 

 as the former, I feel unable to separate them, and Newport's name 

 has priority over Porat's. Complete or incomplete marginal 

 grooves are often present on several segments in front of the 

 twenty-first, which alone has strong marginal ridges. 



