(dr. a. c. oudemans). new list ot dutch acari , ii. 49 



the sternal and the genital shields; further the chelae of both sexes 

 are destitute of appendages. 



It differs, however, widely from the Epicrllnae by the following 

 peculiarities: 1. the genital aperture of the male is approaching 

 the anterior border of the sternal shield in such a way as is quite 

 unknown in the Uropodinae , Antennoplwrinae and Epicrlinae ; 

 2. the body is divided into two distinct regions : a true thorax and 

 a true abdomen ; and this abdomen is movable, like in spiders. The 

 animal is capable of moving it up , down , and sideward , in an 

 angle of nearly 20 degrees. 



This last peculiarity characterizes the animal from all ihe other 

 Parasitidae , even from all the known Acari. 



By the peculiarities of the genital apparatus the animal takes a 

 situation between the three subfamilies mentioned above and the 

 other subfamilies of Parasitidae. 



1. 



62. Key to the subfamilies of Parasitidae. 



The genital apertiu'e of the <? is a 



little split between the sternal 



shield and the mentum . . .2 

 The genital aperture of the S is an 



oval hole in the sternal shield, shut 



by an oval valvule 7 



One $ genital shield 3 



Two ? genital shields , a right and 



a left one 6 



The 2d leg much thicker in S than 



in ? and provided with chitinous 



appendages on femur , genu and 



tibia 1. Parasitinae. 



The 2d leg in both sexes equal .4 

 Tijdschr. v. Entom. XLV. 



