in the British Museum. 113 



everywhere, wliile a row of eighteen arc placed along the 

 liindcr margin of the second tergitc. 



Abdomen. — The abdomen is ratlier slender, with all the 

 dorsal selerites of almost equal breadth and length, with the 

 exception of the first three, which are shorter ; the tergites 

 show scarcely any trace of lateral keels. All the tergites arc, 

 with the exception of the hindmost portion of the eleventh, 

 divided by a distinct longitudinal line. The granules arc 

 perhaps lower than those of the cephalothorax and arranged 

 in circles around the smooth spotswhich surround the lyriform 

 fissures and the articulation of the more or less short, distally 

 dentated hairs. These are situated in the following order : — 

 the first two tergites bear only a row of about eighteen hairs 

 along the hindmost margin of the sclerite; this row is at the 

 third tergite not quite straight, and each half has at least an 

 inner and an outer hair in front of the row : the fourth to the 

 eighth have, in addition to the hindmost marginal row, five 

 hairs on each side in front of the row, placed in an irregular 

 transverse row ; the order of these hairs is not quite sym- 

 metrical right and left ; the right half of the sixth tergite 

 jiossessed, for instance, in one specimen only four hairs. In 

 the ninth and tenth sternites the two rows were not well 

 marked off from each other ; the light spots which surround 

 the hairs are better marked in the anterior than in the pos- 

 terior row ; the hairs of the hindmost tergites are longer, 

 and the eleventh bears a pair of tactile hairs. 



Sternites. — The fifth to the eleventh sternites are similar 

 to the tergites and longitudinally divided like these; but the 

 granulation is more obsolete, and the hairs, of which there is 

 only one row along the hinder margin, are longer and more 

 slender ; those of the anterior sternites are almost simple. 

 The twelfth sternite seems to be missing, or, more correctly, 

 it is fused with the eleventh ; for the latter has in the middle, 

 just in front of tlie hindmost margin, a short transverse 

 groove, partly cutting off its hindmost median portion. The 

 fourth sternite has the anterior margin curved inwards. 

 The genital area is composed of a rather short anterior 

 plate and a longer posterior one; the former has many long 

 slender hairs in the middle, while the latter has short hairs 

 everywhere and covers a pair of " ram's-horn ^^-shaped organs 

 (cf. Ch. cancroides, L.). 



Aittenme. — The jla(jeilum seems to consist of only three 

 hairs, of which the anterior longest one is armed with about 

 nine teeth along the front margin, thus having similarity to 

 a feather. The dorsal margin of the immovable finger pos- 

 sesses some tiny teeth just behind the tip, and thereafter five 



Ann. ^ Macj. N. Hist. Ser. 7. Vol. xv. 8 



