HANSEN: ON SIX Sl'tX'IES OF KOENENIA. 



II. The Material and its Treatment. 



In June 1900 the Danish Zoologist Dr. Th. Mortensen 

 returned from a voyage to Siam. He brought to Copenhagen 

 rich collections of marine animals and besides a number of ter- 

 restrial (and fresh-water) Arthropods collected by him on the Is- 

 lands in the Bay off Siam, especially on Koh Chang, Fortuna- 

 tely he had paid special attention to very small wingless Arthro- 

 pods which are quite neglected by most collectors, and the result 

 was, that he had secured a number of Scolope7idre/la, Fauropns 

 (which I shall describe in two papers in course of composition) 

 and nine specimens of Koe/n/iia. 



The discovery of these last-mentioned very interesting ani- 

 mals in tropical Asia and my disbelief in the determination of 

 the American specimens mentioned above caused me to be des- 

 irous of undertaking a study of as much material as possible of 

 the order in question. At my request Prof. Wheeler gave me 

 six specimens of his larger species from Texas, and Dr. F. Sil- 

 VESTRi not only lent me his single specimen captured in Chile, 

 but presented me with two specimens of a species collected by 

 him in Paraguay and with two analytical figures, one of which 

 is inserted in my paper as a woodcut. I beg Dr. Silvesïri and 

 Prof Wheeler to accept my warm thanks for this most valuable 

 help. Later on Mr. C. Borner (Marburg) kindly lent me a 

 mounted specimen of K. mirabilis, in which the flagellum is 

 quite complete. 



Thus I have had the good fortune to examine a comparati- 

 vely enormous material, viz. six species, of an order of which 

 only one had been established. But I think it advisible to state 

 that the quality of my material has given rise to several short- 

 comings. The specimen of K. cJiilensis is, in my opinion, 

 scarcely quite adult; of four other species the adult female (and 

 sometimes also immature specimens) were present, and only one 

 species, K. Wheclcri, is represented in both sexes. Furthermore, 

 in some species the major part of the flagellum was wanting, 

 and the two South American species were not very well preser- 



II 



