14 NOTES ON MILLIPEDES. 



We found it fairly common at Pactrim in March and April 1897, 

 and in Bangkok in May, June and July. This species is 

 particularly addicted to walking- up the vertical walls of houses 

 at night. 



1 also obtained a species of Spiroholellus in Singapore 

 in 1896. 



Sub-order Polydesnuidea. 

 The Flat- Millipedes are distributed all over the habitable 

 world. They attain to a length of 5^ inches (134 mm.), the num- 

 ber of segments is always 19 or 20. They have no eyes. The 

 pedal laminae are united to the terga. The large platelike 

 processes springing from the sides of the segments easily dis- 

 tinguish these Millipedes from those of the other sub-orders. 



Family Platyivhachidce. 



Millipedes of large or medium size, in which the body is 

 composed of 20 segments, each segment except the first and 

 last being furnished on each side with a large, mx>re or less 

 square and horizontal plate, which bears the scent-pore ; they 

 occur in tropical America and Asia, and attain a length of 

 134 mm. 



16. Acanthodesmus pinangensis, Pocock. A. + M. N. II. Ser. vi 



1897, vol. 20, p. 433. Fig. 6 + 6a, p. 431. 



The type specimen, a male, was obtained by Mr. H. N. 

 Ridley ; subsequently in March 1898. I also caught a specimen 

 at 1300 feet elevation on Penang Hill. 



17. Acanthodesmus perakensis, Pocock l.c.s. p. 434, Fig. 7, p. 



431. Obtained in Perak by Mr. J. H. Leech. 



18. Acanthodesmus petersii, Pocock. l.c.s. p. 434, Fig. 8, p, 431. 

 The type species, a male, is from the Malay Peninsula. 



19. Acanthodesmus lincatus, Pocock, l.c.s. p. 434, Fig. 9, p. 431. 

 This specimen was discovered by Mr. II. N. Ridley in 



Singapore. 



When in the Larut Hills in April 1898 I collected a large 

 series of Millipedes of this family, representing two hitherto 

 undescribed species of Acanthodesmus, and two species of a new 



