TWO NEW LICE. 247 



segment longest, third with distal preaxial angle produced a little 

 and carrying a sensorium. Another larger sensorium between 

 segments 4 and 5. The mouth opens on the ventral surface. 



Thorax of an unusual shape. Narrower than the head and 

 very elongate. Lateral margins almost parallel-sided. Meso- 

 thoracic spiracles on the extreme margin. Legs : First pair very 

 small. Third pair relatively immense. 



Abdomen : Last segment ends in a cone. Lateral margins 

 parallel-sided. Pleurit.es are elongate plates with the spiracle in 

 the centre, lower margin straight, lateral margins indefinite, 

 converging anteriorly. Each segment with a single broad tergite 

 and sternite. Genital plate is long and covers the three terminal 

 segments, which are, therefore, without separate sternites. 



External Form. Female. (Text- fig. 2.) — Antennae with third 

 segment normal. Abdomen : There are two tergites and two 

 sternites on each of segments 4 to 7. On segment 2 only a single 

 tergite and sternite each. On segment 3 there are two sternites 

 and one tergite. On segments 8 and 9 only a single tergite. 

 The genital plate on sternum of segment 8 is illustrated in text- 

 fig. 2, which also shows the two small plates on each side of the 

 plate — the representatives of the gonopods. End of the abdomen 

 broad, truncate. 



Chcetotaxy . Male. — Head : On the dorsal surface, preantennal 

 area, a transverse row of four or five minute hairs. On the anterior 

 margin four larger hairs, widely spaced. Behind the antennae a 

 transverse row of six minute hairs, the two middle ones the 

 smallest. A single stout, elongate bristle at each posterior 

 lateral angle of the head. In front of this, inside the lateral 

 margin, a minute hair, and in front of this again, and well 

 spaced, three more minute hairs, one behind the other. On the 

 ventral surface just in front of the antennae there is a transverse 

 row of about a dozen small hairs in a semicircle. Behind this, 

 near the base of each antenna, a single strong bristle. Thorax : 

 A large hair on the inside of each mesothoracic spiracle and a 

 small one just in front. Along posterior margin of metanotum 

 two hairs. Abdomen : Each pleurite with two hairs on lower 

 margin. These are both small on segments 2, 4, 5, and 6. One 

 of the two (the dorsal one) is longer than the other in segment 3, 

 while on segments 7 and 8 they are both very long. On tergite 1 

 there are two flattened spines, spear-shaped, with sharp tips. 

 On tergite 2 there are two more spines of the same character, 

 and near the base of each of these two minute hairs. On each of 

 tergites 3 to 6 is a row of flattened spines and hairs mixed and 

 arranged along an irregular transverse line (see text-fig. 1). 

 On tergite 7 are only four spines, of which the outer one on each 

 side is broadest and most lanceolate. On tergite 8 are four 

 minute hairs, the two inside ones being the smallest. At the 

 extreme conical tip of the terminal segment two small hairs in 

 large alveoli. On all sternites except no. 3, which has three, and 

 the last, which is bare, are two lanceolate spines. 



