from the Chinese Seas. 367 



black stripe separating this lower flavous area from the dorsal 

 flavous stripe narrow, consequently the body might with some 

 accuracy be described as flavous, with three black bands ; 

 these tliree black bands fusing together anteriorly, so that the 

 front of the body, ^. e. about the iirst three segments, and the 

 upper half of the head are fuscous ; a darker band between 

 the eyes ; lower half of head and legs fulvous ; anal segment 

 fuscous ; antennas infuscate, pale at the base. 



Eyes well developed, composed of six transverse rows of 

 ocelli. 



Head smooth, without frontal setae. 



Antennce practically as in I. sabulosus. 



First segment larger than in sabulosus, its lateral angle 

 much less narrowed, with its thickened antero-lateral border 

 not emarginate ; the lateral portion also striate right across, 

 with fine strise extending along the posterior border up to the 

 summit ; second segment also larger than in sabulosus, its 

 inferior portion much larger and produced forwards towards 

 the mandible. The rest of the segments closely and densely 

 striate from base to summit ; most of the strise complete, i. e. 

 extending from the sulcus to the hinder border, some of them 

 falling short ; on segments 2 to 6 the two stria on the summit 

 sensibly diverging from before backwards, and leaving a 

 triangular space, which on the posterior segments becomes 

 filled in with striae. Pores at anterior end of the body close 

 behind the sulcus, though barely touching it, posteriorly 

 gradually receding, until at the hinder end the space between 

 the two is greater than the diameter of the pore ; the sulcus 

 scarcely sinuate opposite the pore. The anterior half of the 

 segments only finely striolate. 



Ajial valves and sternite as in /. sabulosus. 



Caudal process acutely angular, but only surpassing the 

 valves a little, not upturned apically. 



Legs as in /. sabulosus. 



Number of segments 59. 



Length 31 millim., width 2'3. 



Loc. Da-zeh Valley, Che Kiaug [Bassett- Smith). 



Family Spirobolidae. 

 Spirobolus Walkeri, sp. n. (PL XI. figs. 14, 14 a.) 



$ . — Colour deep olivaceous, with the posterior border of 

 the segments yellowish red ; the anterior border of the collum 

 and the posterior half of the caudal process yellowish red ; 

 antenna and legs fuscous, in young examples yellowish ; the 

 anterior two pairs of legs always yellow. 



