A MONOGRAPH OF THE PILL-MILLIPEDES. 467 



Head very sparsely punctured. Nuchal-plate -without punctures 

 with a fine and nearly straight groove before its sinuate anterior border. 



1st tergite somewhat abruptly sloped in front, but not sulcate ; 

 lamina small, rising gradually, with evenly thickened edge. 



Anal tergite without marginal notch, but with a distinct inner ridge. 



Legs attenuate at the apex, with a single spine above claw. 



$ Apical segment of antennte distally expanded. Anal tergite 

 markedly saddle-shaped. Forceps. — 1st pair with immovable dactylus a 

 little shorter than the movable, lightly incurved ; movable dactylus stout, 

 externally convex, internally concave, with rounded apex, not dentate, 

 the distal end indistinctly separated by a suture. Second pair with 

 immovable dactylus blade-like, wider at base than apex, with nearly 

 straight outer and inner edges and truncate apex, not dentate ; movable 

 dactylus with its distal third separated as a distinct segment, wider at 

 base than apex, with very convex outer surface and correspondingly 

 concave inner surface. 



9 Apical antennal segment almost cylindrical, very slightly dilated 

 at its distal end. Anal tergite not saddle-shaped, evenly roiuided. 

 Vulva with proximal portion much the larger of the two and some- 

 what quadrate, with straight inner border and convex outer border ; the 

 distal portion or cap very short, as in Z. impressa, with rounded outer 

 and inner angles and lightly concave distal margin. 



Length less than 20 mm. 



Several specimens of both sexes from Sikkim [Dr. Hooher'). 



This species is most nearly related to Z. tigrina. It differs from it, 

 however, in being wholly smooth and differently coloured. The 

 difference exhibited by the sexes in the form of the apical antennal 

 segment led Mr. Butler to refer them to two distinct genera. 

 Zephronia mamdata (Butler), pi. B., fig. 13. 



Sphcerotherium maculatum, Butler, Ann. Mag. Nat, Hist. (4), XIV, 

 p. 186 (1874). 



This species, of which only the female is known, is closely allied to the 

 preceding, Z. excavata, Butler. It is kept, however, separate from the 

 latter on account of the characters mentioned in the key to the species 

 published on p. 471. 



Length about 35 mm. 



Locality. — Sikkim (Dr. Hooker). 



