14 



one or more strong spines, which for descriptive 

 purposes I have termed Comtlti. This armature of 

 the vesica may be represented by a bulbed cornutus, a 

 short bulbed cornutus, a spicule, a band of teeth, or a 

 comb of teeth. 



The orifice of the ;doeagus may be hooked, 

 scobinated, dentated or crested. 



FEMALE. 



It may be thought with such elaborate organs for 

 clasping, that corresponding features would be found to 

 exist on the exterior of the female abdomen. This is 

 not entirely so, indeed so far as known to me at present, 

 with a few notable exceptions, the external organs are : 



The Lodix (coverlet). The central plate upon 

 the anal edge of the lower surface of the 7th abdominal 

 segment, and which covers the genital plate. 



The Genital Plate, a strongly chitinous plate 

 varying in different species, leading to the genital tube. 



The Ovipositor, a segmented tube of varying 

 length bearing a lateral pair of lobes, which is usually ^ 

 withdrawn within the body cavity. 



In cases where there is a specialised complicated 

 structure in this sex, there is little doubt the mechanism 

 is specially adapted for oviposition, and not for 

 copulation. (Vide Nonagria cannce and Calymnia 

 pyralina) . 



Recent investigations tend to show that some 

 variation exists in the internal female organs, especially 

 among the Geometrcz ; Copulation takes place by the 

 insertion of the penis into the genital tube. 



I have found it necessary to make use of certain 

 adjectives in the descriptions, which will convey a 

 definite meaning to various ornamentations of the 

 chitine. 



