Genera ami Species of Mill i pedes. 439 



less from tlie edge. Caudal process with two pairs of promi- 

 nent tubtMclcs at the sides of the ])osterior border, wliich is 

 rather stiongl}' though not anguhirly produced mesially. 



Sternal spines strong, the posterior pair directed poste- 

 riorly, tlie anterior pair downwards and forwards. 



Measurements in miUimetres. — Total length 7G ; widtli of 

 second torgitc 10, of fifth 12*5. 



Loc. [Singapore (//. N. Ridley). 



In colouring this species seems to resemble P. suhvittatuSj 

 Peters (Mon. Ak. Wiss. Berlin, 18(54, p. 545), the type of 

 the genus, which came from the island of Linga, 100 miles 

 to the south-east of lSinga[)ore. There is nothing, in fact, in 

 Peters's diagnosis to separate the two ; but Mr. O. F. Cook, 

 who has examined the type, says in his diagnosis of the 

 genus PhractodesinuSj " first segment broadest at or behind 

 the middle/' which is certainly not the case in Ridley i ; and 

 again, '' carinas laterally margined outside the pore." But in 

 Ridleyi the margination is scarcely, if at all, more noticeable 

 than what is presented, for example, by Acanthodesmus 

 Andersonii, Poc. So that, apart froui geographical reasons, 

 there is little doubt that the two arc specifically different, 

 though I strongly suspect they are referable to the same 

 genus. 



Genus Ilodesmus, Cook. 

 Itodes7nus, Cook, Brandtia, i. p. 1 (189G). 



Ilodesmus Whiteheadi, sp. n. (Fig. 15.) 



$ . — Colour black, with a longitudinal yellow band 3-4 

 millim. wide, extending from the summit of tlie head on to 

 the caudal process ; legs and antennai fulvo-fuscous ; sterna 

 brown. 



Antennce a little longer than the width of the first tergite, 

 much less than that of the second. 



Fii-st tergite widest across the middle, its anterior border 

 convex. Dorsum convex, rather coarsely but not very closely 

 granular, nineteenth segment nearly if not quite smooth ; the 

 rows of tubercles traceable on all the segments except on the 

 first, which seems to be uniformly granular. Anterior and 

 posterior borders of the keels finely serrulate, lateral border 

 not emarginate, but furnished with small rounded or sharp 

 teeth, irregular both in shape and number ; anterior border 

 with basal shoulder ; anterior angle squared even on the fifth 

 segment, often a little produced laterally, the anterior border 

 straight or slightly convex ; posterior border slightly concave 



