368 



MR. W. F. LANCHESTER ON THE 



[Dec. 2, 



D. miles. 

 c. Sand and Carpus. 

 Much as in B. mer- Two rows of 11-12 



B. merguiensis. B. intermedius. 



guiensis, but 

 tubercles less pro- 

 minent and more 

 thickly placed. 

 Two rows as in 

 B. merguiensis. 



d. Fingers. 

 30 granules in the 

 external row. 

 (?) 



8. Antenna! scales. 



The inner process 

 extends as far as 

 the middle of 

 the penultimate 

 joint. 



and 

 pili- 



acuto 

 on 



Palm 



graiuiles, 



immerous 



ferous 



tubercles 



carpus. 



similar, Init the 



two rows number 



8 externally, 5 



internally. 



16-17 granules. 



The row of gran- 

 ules on the under 

 margin of the 

 immobile finger 

 extends as far as 

 the carpal joint. 



Inner process ex- 

 tends a little be- 

 yond the peniilti- 

 mate joint. 



Two rows of 11-12 

 granules, and less 

 numerous gran- 

 ules, with 1-2 

 hairs at bases 

 onlj', on carpus. 

 On palm the two 

 rows number 25- 

 27 externally, 10- 

 11 internal]}'. 



25-27 granules. 



Row of granules 

 extends partly on 

 to the hand. 



B. mixtus. 



As in B. inter- 

 medius, but, on 

 the carpus, the 

 two rows number 

 14-15 each, and 

 on the palm 10- 

 11 each. 



24 granules. 



As in B. 

 ensis. 



Inner process ex- 

 tends to the an- 

 terior X of the 

 penultimate 

 joint. 



As in B. 

 medius. 



mcrgui- 



inter- 



From this table it may be seen that Z>. mixtus combines some 

 of the characters of the other thi-ee species with characters of its 

 own in svich a way that it is difficult to regard it as a vaiiety of 

 any one of the othei- species, and necessary to regard it as a 

 distinct, though closely allied form. 



IX. Genus Cienobita Latr. 



18. OCENOBITA COMPRESSUS M.-Edw. 



Coenohita compressus M.-E. Hist. Nat. Crust, ii. p. 241 (1837); 

 Ortmann, Zool. Jahrb. Syst. vi. p. 318 (1892). 



Loc. Pulau Bidan, Penang. One specimen from Doliain, twt) 

 from Miirex, one from Pu,rpura, and numerous other individuals. 



Ortmann's diagnosis is deceptive in so far as the outer surface 

 of the 3i'd left leg is not quite smooth in large individuals, but, 

 like the cephalothoiux, finely granulated oi' tuberculated ; the 

 short stiff hairs springing from these tubercles in front at the 

 base ; the tubercles themselves being sometimes corneous at 

 the tips. The same remark holds good also for some large speci- 

 mens, in the Oambiidge Museum, of C. rugostcs from Tori'es 

 Sti'aits. On the last joint, however, in both species, the granu- 

 lation is confined to the proximal | or 4- of the joint. Furthei', 

 the ridge on the outer surface of the penultimate joint becomes 

 I'ounder, the larger the individual. No doubt these charactei's 

 are correlated with age. 



19. OCENOBITA RUGOSUS M.-Edw. 



Cmwbita rugosus M.-E. Hist. Nat. Crust, ii. p. 241 

 Ortmann, Zool. Jahrb. Syst. vi. p. 317 (1892). 



(1837; 



