BASED ON A STUDY OF THE MALE GENITAL ARMATURE. 



11 



macerated in caustic potash for a few minutes this organ, which is really a 

 modified segment of the abdomen, can be turned backwards, as shown in fig. 2, so 



Fig. 1. 



-Hypopygium of male Qlussina, as seen when closed ; the dotted lines indicate 

 the position of the superior claspers beneath it. 



that its ventral surface together with its various and complicated structures are 

 displayed. These appendages are : 



1. Superior Claspers {sc in all the figures). The position of these organs when 

 the hypopygium is closed has already been described and it is indicated by the 

 dotted lines in fig. \sc. These organs can be erected to an angle of varying 

 degrees ; but in life they are never extended backwards so as to lie in a 

 horizontal position or in the same plane as that of the abdomen, and considerable 

 pressure is necessary to bring them into this position (see dotted lines in fig. 2). 



Fig. 2. — Hypopygium of male Glosiina extended backwards so as to display the 

 genital armature. 



