hanskn: on six species ük koenenia. 229 ■ 



tarsal joint is somewhat longer than the first and a little longer 

 than thick; the first tarsal joint is conspicuously longer than the 

 second, the third joint is considerably shorter than the first and 

 the second together. 



Legs. They are more slender than in K. ai/giista. The 

 first pair (fig. 2 c) has the tibia two and a half times longer than 

 thick; the third metatarsal joint is slightly longer than the fourth, 

 with its stift" seta (s) inserted at the middle: the last joint is 

 scarcely three and a half times longer than thick. — The last 

 pair of legs (fig. 2 d) has the metatarsus as long as the second 

 tarsal joint plus the half of the first, its sensory seta (s) is inserted 

 equidistant from the base and the middle of the joint and reaches 

 a little beyond its distal end; the first tarsal joint is about two 

 thirds as long as the second. 



Abdomen (fig. 2 e and 2 f). Ventral sacs arc wanting. 

 The ventral side of the fourth, fifth and sixth segments has 

 two pairs of longer hairs and two pairs of short sublateral hairs ; 

 the longer hairs of the pair nearest to the median line are very 

 distant from each other, in the fourth and fifth segments about three 

 times further from each other than the distance between the two 

 longer hairs on the same side. — The three posterior segments have 

 a seta in the median line; the last segment has ten setae. (Even 

 in the largest of the immature specimens the hairs and setae are 

 reduced in number: the lateral pair of short hairs is wanting in 

 the fourth, fifth and sixth segments, the three posterior segments 

 have no median ventral seta, and the last segment has only eight setaî). 



Flagellum. It is quite wanting in the adult, but in the 

 largest of the immature specimens the basal joint (fig. 2 g) is 

 present : the length (without the basal subjoint) exceeds the thick- 

 ness by one half. 



Sexual characters. Female: The ventral surface of the 

 second segment (fig. 2 f and fig. 2 i) has five pairs of longer 

 hairs, and the first pair is inserted considerably in advance of 

 the next-, besides five pairs of very short hairs are found at the 

 apical part of the sexual lobe. 



Length. The adult specimen is about i mm. long. 



Locality. Island Koh Chang (oft" Siam), mider stones, Jan. 

 7. 1900 (Dr Th. Mortensen leg.). 



37 



