Mr. G. Newport on new species of Myriapoda. 267 



gated, slender, with the sixth joint clavated ; body both anteriorly 

 and posteriorly very much attenuated, the second, third and fourth 

 segments narrower than the head ; legs slender. 



1. P. rugulosa. Gray (sp.). Body dark brown, with a single median 

 light- coloured line ; head, eyes, and distal portion of each joint of 

 the antennae, black ; segments with numerous elevated longitudinal 

 striae terminating in acute points ; segments sixty-one. Length 

 \\ inch. 



2. — lineata, Gray (sp.). Dark brown.with a single median red line, 

 and one lateral one on each side ; posterior half of each segment 

 short, with longitudinal elevated striae ; prothorax small, with the 

 anterior half smooth and the posterior marked with elevated striae ; 

 segments sixty- one. Length ly^^ inch. North America. 



3. — Richil, Gray (sp.). Yellowish brown ; antennae pubescent, with 

 the third joint elongated ; the posterior half of each segment with 

 numerous elevated longitudinal lines ; those on the side united 

 into an arch, including the foramina repugnatoria ; segments forty - 

 eight. Length 2 inches. Malta. 



4. — Xanthina, mihi. Body polished, ochraceous, slightly com- 

 pressed, with the posterior half of each segment with numerous 

 slightly raised lines ; antennae very long, with the third basilar 

 joint longer than the second ; occipital portion of the head exca- 

 vated, front flattened ; legs elongated ; segments forty- eight. 

 Length 5 inches. Valley of the Xanthus, Asia Minor. 



5. — Hardwickei,Grsij (sip.). Ash-coloured, polished ; segments sixty- 

 one, smooth, with the posterior half bordered with little triangular- 

 shaped plates ; head with the occipital surface excavated, and the 

 front with a broad cup-shaped surface ; eyes subtetragonal, elon- 

 gated, with the internal angle acute and formed of five rows of 

 ocelli; legs elongated ; segments sixty-one. Length 1| inch. 



This genus reminds us strongly of the characters given by 

 Risso of his genus Callipus, with which indeed it agrees in the 

 form and length of the antennse and legs. But the characters 

 given by Uisso apply equally well to many species of the true 

 luli, while no notice is taken by him of the very marked struc- 

 ture on which I propose to found this new genus, Platops, the 

 short and flattened frontal surface of the head, and the narrow- 

 ness of the anterior segments. I am not acquainted with Risso's 

 species, and until then I shall propose to consider the two genera 

 as distinct. 



Genus Iulus, Linn, 

 1. /. terrestris, Linn. 

 2. — pilosus; segments fifty- six, hairy, Newp. Hampstead. 



3. — niger, Leach. 



4. — sahulosus, Linn. 



5. — canadensis, mihi. Reddish flesh-coloured, with black lateral 

 spots beneath a longitudinal series of whitish patches ; segments 

 fifty-three, smooth, polished, without striae on the dorsal surface ; 



