2 12 ■ ENTOMOI.OdlSK TIDSKRIKT 1901. 



fig. 2 g); it is more slender than in K. a7igusta, but offers no 

 other point of interest, with the exception that its basal subjoint 

 has at least six exceedingly short setne on the lower side, but 

 none on the other two thirds of its margin. 



My description of the flagellum in the various species is 

 rather long, perhaps too long in proportion to the morphological 

 interest and systematic value of this organ. And the syste- 

 matic value of the differences between the species is very much 

 diminished by the fact, that the flagellum is partly or wholly lost 

 in more than four fifths of the animals brought home from ex- 

 cursions and voyages. Nevertheless I think it justifiable that 

 1 have spent the space necessary to describe its complicated 

 structure. 



f. Sexes. I have examined adult females of all my spe- 

 cies with exception of Â'. cliilcnsis, of which the single specimen 

 seems to be immature (it was flattened much from pressure and 

 a thorough investigation of the area in question was impossible). 

 The environment of the female genital aperture presents a rather 

 uniform structure in the species known to me (the genital valves • 

 figured by Wheeler op. cit. p. 845 and belonging to a species 

 unknown to me are very aberrant, but I do not know whether 

 the animal was a male or a female). The second abdominal seg- 

 ment is produced downward and somewhat backward into a lobe, 

 which seen from in front is broadly triangular, and its end is 

 generally more or less incised in the median line. The lower 

 surface of this second segment faces downward and much for- 

 ward; this surface and the lobe are adorned with hairs, the 

 number and arrangement of which offer specific characters (comp. 

 f. inst. fig. I f, fig. 2 f. and fig. 3 f. on pi. 4). The third seg- 

 ment is anteriorly on the ventral side produced into a lobe, 

 which seen from the side is triangular and terminates in a ven- 

 tral process; examined from below it is perceived with more or 

 less difficulty that in reality a pair of processes with a narrow 

 incision between them is present ; the lobe is adorned posteriorly 

 with two pairs of short hairs. 



Among the specimens of all the species I found but one 

 which certainly is a male. This specimen belongs to A. WJicclcn. 

 Fig. I a on pi. 3 exhibits the surroundings of the genital aper- 



20 



