508 MR. F. G. SINCLAIR ON THE [Dec. 3, 



DIPLOPODA. 



Order HELMINTHOMORPHA. 



Sub-Order Colobogx.vt 11 a. 

 Siphonophora longieostris Silvestri. (Plate XXX. figs. 1 3,5.) 



From Kuala Aring, Kelautan State. 



Silvestri's description is very short, but 1 think that this species 

 must be identical with the one from New Guinea described by him, 

 or, at any rate, very closely allied. 



Length 45 mm., width 3 mm. Number of somites 93. 



Colour red-yellow, shading into pale yellow from the sixth somite 

 to the head ; legs pale yellow. 



Head with long, slender, curved beak. Antennas a little longer 

 than the beak ; terminal joint large and rounded, other joints 

 equal. Antenna? and head covered with close-set hairs. 



1st tenjite curved where it joins the head, broad, about double 

 the length of the succeeding tergite. Keeled like the others. 



Pores situated on the keel. The side below the keel runs straight 

 down to join the pleurae at a fairly sharp angle, thus making the 

 shape of the body rather square than cylindrical. 



Legs very short and thickly haired ; joints about equal, ending 

 in a blunt claw. 



Anal valves rather small, one sternite behind the anus without 

 legs and divided by a median longitudinal furrow. Body tapering 

 very gradually before and behind. 



Plattdesmus kelantanicus, sp. now (Plate XXX. tigs. 4. 6-9.) 



From Kuala Aring, Kelautan State. 



Colour dirty brown ; head clear yellow ; legs and sterna pale 

 yellow. 



The largest specimen has 79 somites ; length about 50 mm. by 

 5 mm. 



The smallest 77 somites ; length 43 by 44 mm. 



Head heart-shaped, small, covered with very tine short hairs. 

 Antenna' (fig. 9) short and thick, nearly equal joints, the second 

 being a little the longest. 



The hypostoma (fig. 8) has the maxilla? large, inframaxilla 

 single, large at base, contracting rapidly to a spike-shaped elonga- 

 tion, which extends almost the whole length of the hypostoma; 

 galeae small ; small cardiues ; basals normal ; maxilla furnished 

 with a lew bristles at the anterior edge. 



Mandible with a long slender shaft, then a short movable joint, 

 then a pectinated terminal portion (see fig. 7) consisting of a row 

 of bristles supported by a slender shaft which has a ring at some 

 distance from the end which looks like a joint, but is, I believe, 

 immovable. 



