THE GENUS LEBERTIA. 507 



proximity to the epiinera, genital and anal areas the ridges to 

 some extent follow the outline of these more highly chitinised 

 structures. The skin would appear to be thin, as Thor has 

 been unable, except in isolated cases, to detect the groups of fine 

 pores which are prominent in other species, though the epimera, 

 genital valves, legs and palpi exhibit the coarsely porose appear- 

 ance to be found throughout the genus. 



The capitulum is of the form normal to the genus, and is about 

 0*22 mm. in length, with a breadth of nearly 0*12 mm. It does 

 not fully take up the area bounded by the inner margins of the 

 first pair of epimera. While the anterior processes of other 

 species have an upward and outward tendency, i.e. towards the 

 interior of the body, in this species they are more slender and 

 come closer in to the capitulum, lying more in a horizontal 

 direction and less towards the interior of the body. The posterior 

 processes are fairly slender. The mandibles, like the anterior 

 processes, are more drawn in towards the capitulum than is 

 usually the case. They are fairly long, and extend beyond the 

 pharynx and the extremities of the anterior processes. An 

 average length for the palpi would appear to be slightly over 

 one-third of a millimetre. The fourth segment is longer and 

 thinner than the two preceding ones, while the fifth is relatively 

 long and thin and tapered. The extensor surface of the first 

 segment has one long fine bristle. The corresponding region of 

 the second segment has four bristles, of which the two longest 

 are almost distal, while on the flexor surface, set well back from 

 the distal extremity, there is a strong, curving bristle, which is 

 moderately long and finely pectinate. The inner surface of the 

 third segment has five bristles ; three of these are distal, finely 

 pectinate, and about as long as the fourth segment. The middle 

 one of the three lies rather more towards the bristle at the 

 extensor edge, which happens to be a little less distal than 

 its companions. The fourth bristle lies about the middle at 

 the extensor edge of the segment, while the fifth lies slightly 

 behind it and rather more inwards. The distal extensor surface 

 of the fourth segment has six hairs of varying length ; five 

 of these are more or less grouped about the distal extremity, 

 but the sixth lies farther back. The flexor surface has the 

 usual two fine pores with accompanying diminutive hairs; one of 

 these pores lies about the middle, the other one is nearly proximal. 



