10 



ARKIV FÖR ZOOLOGI. BAND 7. N:0 28. 



between coxae III or IV, it would obviously not be possible 

 for the males to get hold of the sacs. 



If this is true, it would follow, that in the genera with 

 a more posterior position of the J" genital shield there would 

 be no seeondary characteristics, at least on the mandibles 

 (and probably also on legs II) of the male, and, as a matter 

 of fact, this holds also good for most^ of them. No obser- 

 vations as to the mode of coition of the Uropodince have as 

 yet been made and we are therefore under the necessity of 



Fig. 17. 



Urodinychus Krameini (G. Can) (after Trägaedh^ 

 Fig. 17. Hvpostoma 9, ventral view. X 540. 

 Fig. 18. ' » d, » » X 386. 



drawing our conclusions exclusively from the externa! mor- 

 phology. 



In one case, by the w^ay the only one, where the true 

 Uropodince (e. g. those provided with foveolae pedales) have 

 been examined with regards to the gnathosoma of both sexes, ^ 

 in Urodinychus Kramerii (G. Can) there is a difference in the 

 shape of the hypostomatic hairs, which is very suggestive: In 



' In Discopoma cassidea, for instance, there are spurs on legs II 

 [1. fig. o, pl. 167]. 



* This is no doubt due partly to their supposed uniformity, partly 

 to the difficulty in dissecting them. 



