174 MR. A. G. BUTLER ON THE GENERA [Feb. 4, 



The external rim on the last segment of this species seems feebly 

 developed, judging by Koch's figure. 



Div. 2. Last dorsal segment with a more or less pronounced sinus 



behind. 

 Sect. a. Dorsal segments roughened, dull ; head and nuchal plate 



clothed with hair. 



7. Spheerotherium sinuatum. 



Spheerotherium sinuatum, Butler, Ann. & Mag. Nat. Hist. ser. 4, 

 vol. x. p. 359, pi. 18. f. 10 (1872). 



Sarawak (Wallace). Type, B.M. 



Sect. b. Dorsal segments roughened, dull, clothed with short hair, 

 and with longitudinal central shining ridge. 



8. Spheerotherium dorsale. 



Zephronia dorsalis, Gervais, Hist. Nat. des Insectes, Apteres, iv. 

 p. 79 (1847). 



Zephronia pulverea, White, Ann. & Mag. Nat. Hist. ser. 3, vol. in. 

 p. 405, pi. 7. f. 4, 4a, 4b (1859), type. 



Spheerotherium retusvm, Koch, Myriapoden, pi. 19. f. 36 (1863). 



Port Natal (Gueinzius). B.M. 



Div. 3. Last segment rounded, without external rim or depression. 

 Sect. a. A more or less continuous shining longitudinal dorsal 



ridge. 



9. Spheerotherium lichtenstetnii. 



Spheerotherium lichtensteinii, Brandt, Bull. Nat. Mosc. vi. p. 199. 

 n. 3 (1833); Koch, Myriapoden, i. pi. 14. f. 29 (1863). 



Zephronia lichtensteinii, Gervais, Ann. Sc. Nat. 2nd ser. vii. p. 43 

 (1837). 



South Africa (Sir Andrew Smith). B.M. 



Group aa. Last segment with posterior central area projecting. 



10. Spheerotherium punctatum. 



Spheerotherium punctatum, Brandt, Bull. Nat. Mosc. vi. p. 199. 

 n. 4(1833). 



Zephronia punctata, Gervais, Ann. Sc. Nat. 2nd ser. vii. p. 43 

 (1837). 



" Head almost smooth, shining, marked by very large scattered 

 punctuations above and in the middle. A row of very strong 

 punctuations upon the front of the collar, with others larger and 

 scattered upon the centre. Second and the following segments 

 marked up to their inferior and posterior margin with strong 

 punctures, easily visible to the naked eye. Punctuations of the last 

 arch more close, but not visible to the naked eye ; the latter a little 

 tbickened and swollen to the centre of its posterior margin. Sixth 

 and following dorsal segments marked in their centre above by a 



