HANSEN: ON SIX SPECIES OF KOENENIA. 1 95 



to belong to the Italian species. He kindly sent me a coj)}' of 

 the paper, and instantly I saw from his description and figures 

 that it was a new species. Later on he presented me with six 

 specimens, and now I am able to say that he has discovered 

 two new species, of which that which is common at Austin 

 is described below as K. Whceleri Rucker. Prof. Wheeler 

 writes on p. 845 that from his preceding description of the com- 

 mon form ;;^a single specimen among my material dififers so 

 much that I am compelled to regard it either as the hitherto 

 unknown male of Grassi's species or as an entirely new form». 

 He says that this specimen was »only -5 mm., in length», he 

 describes and figures its flagellum containing only six joints, and 

 he figures the genital valves which dititer exceedingly from those 

 of all the species known to me. Of the six specimens he sent 

 me five are females and one is an adult male belonging to the 

 same species as the females; I am therefore able to state with 

 absolute certainty, that the very small specimen with six-jointed 

 flagellum must be another species; and the shape of its genital 

 valves differs so widely from that in all the other species that 

 I should not be surprised, if this small species on a closer exa- 

 mination exhibited other aberrant features and must be establish- 

 ed as a new genus. Prof. Wheeler writes (p. 842): >' Hansen 

 and Sorensen have failed to give a satisfactory account of the 

 ventral surface of the abdomen». If he had had a little more 

 confidence in the accuracy of our account and of that given by 

 Grassi he would not have fallen into the error of referring his 

 larger specimens to the species K. mb'abilis. Our description 

 and figures of the spine-like setae on the fourth segment and of 

 the six procurved setae on the wart-like protuberance on the 

 sixth segment are quite correct, and these structures are not met 

 with in the species from Texas or in any other of my species. 

 He mentions (p. 843) six pairs of papillae at the genital aper- 

 ture, and this proves that he described and figured the male, 

 while the surroundings of the same aperture in the female of his 

 larger species are very much like our old figure of the female 

 of K. mirabilis. A most interesting feature discovered by him, 

 viz. the occurrence in his species of three pairs of abdominal 

 ventral pouche?, will be treated later on. Apart from the diffe- 



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