228 ENTOMOLOGISK TIDSKRIFT 19OI. 



than thick, and the glabrpus setœ in the subapical whorl are 

 moderately long and ro])ust. The figure exhibits an anomaly 

 in structure decribed on p. 211, to which the reader is referred. 



Sexual characters. Female. The ventral surface of 

 the second segment (fig. i f) has five pairs of longer hairs, and 

 the two anterior pairs are arranged in a transverse line, a feature 

 which öfters an excellent specific character. 'I'he sexual lobe 

 has close to and on the margin four pairs of short hairs. 



Length. The specimen drawn in fig. i a is -84 mm. long, 

 the longest specimen is -94 mm. long (the aljdomen -63 mm. long 

 and only -15 mm. thick). 



Locality. Island Koh Chang in the Bay of Siam, under 

 stones, Jan. 7. and 17. 1900 (Dr. Th. Mortknsen leg.). 



5. Koenenia siamensis n. sp. 

 I'l. 4, fig. 2 a — -2 i. 



Material. One adult female and two immature ones, one 

 larger and one rather small; all were well preverved, but the 

 flagellum almost totally wanting. 



Head. The frontal sense-organ is very robust, certainly 

 larger and thicker than in K. a?igi(sta, the branches with the 

 end more or less obtuse, but it was impossible to measure the 

 organ (without undertaking a dissection). The lateral groups 

 witli three organs shaped as in K. û?ig!tsta. ■ — The large ster- 

 num with seven hairs (fig. 2 a) which may be said to be arranged 

 in four transverse rows: posteriorly two hairs near to each other, 

 considerably in advance thereof one hair, and then two pairs 

 obliquely in advance of each other, and the distance between 

 the hairs of the same i)air very much longer than in the i)Oste- 

 rior j)air. 



Chela. Each finger has nine normal, rather slender spines 

 and a rudimentary one ; the distal spine is consi)icuously larger 

 than the following, and most of the spines with an accessory 

 small apex on the proximal margin. 



Palpi (fig. 2 b). They are rather thick. The tibia is 

 slightly more than twice as long as thick. The second meta- 



36 



