( cxxiv ) 



with the second segment of the male when mating takes place, 

 the ovipositor or possibly the " bursa copulatrix " of the 

 female being clasped by the secondary armature of the male 

 that is connected with this area. The origin of this extra- 

 ordinary development has yet to be discovered, the arrange- 

 ment being nearer to that obtaining in certain of the Crustacea 

 than to any other order, if perhaps we except the Araneina. 



Bearing in mind these important characteristics, we will 

 consider the primary clasping organs in a few families of the 

 Zygoptera and the Anisoptera; in the former space only 

 permits me to figure three genera in the Calopterygidae and 

 one in the Agrionidae* 



Calopteryx maculata 



has the superior appendages ( ? = tegumen in Lepidoptera) 

 of a broadish triangular shape, the apex of the triangle being 

 hooked and forming the apex of the appendage, this is the 

 organ that will clasp the back of the head or the prothorax ; 

 the inferior appendages ( ? = the harpagones in Lepidoptera) 

 consist of a ventral sclerite that is round, tapering slightly 

 forwards {i. e. away from the head of the fly), and with a 

 slight hook at the apex; in addition to which at the base is 

 a cuneate hairy pad. 



Hetaerina aniericana. 



The superior appendages are long, bifurcate, narrower at 

 the base, becoming heavily notched near the middle, from 

 whence they are broader up to the rounded apices ; the 

 inferior appendages are short, paired, somewhat cone-shaped, 

 but abruptly truncated at the apices instead of terminating 

 in a point ; the lateral hairy pads are also present. 



Rhinocypha biseriata 



has a single tapering superior appendage shortly spined 

 with the apex expanded; the inferior are paired, somewhat 



* I am greatly indebted to Dr. Walker of Toronto for allowing me to 

 reproduce the figures showing the copulatory position in Odonata ; the 

 figure is taken from his well-known work on the North-American species 

 of AescJma ("Studies Univ. Toronto," 1912). 



