156 BKITISH CICAD.^. 



NOTES ON THE PYGOFEE OF THE 

 TETTIGIDiE. 



It will be admitted that the significance of the 

 complex organs connected with the reproductive 

 system of insects is often beset with difficulty. 



Much attention has of late been bestowed on the 

 description of the multiform adjuncts to the terminal 

 segments of the abdomen of Lepidoptera, Hymeno- 

 ptera, and Hemiptera. These body-rings, or portions 

 of them, are variously known as pygol'er, oedeagus, 

 or genital segments. The elaborate work on the 

 American Noctuidse, now in course of publication by 

 Prof. J. B. Smith, is an instance of the economic 

 importance to insects of these parts. 



Dr. Daniel Sharp's suggestive memoir (see Trans. 

 Ent. Soc. pt. iii. 1890) on the structure of the ter- 

 minal segment in some male Hemiptera-Heteroptera 

 has been already alluded to. His remarks will be 

 seen to have some bearing on the anatomy of similar 

 parts in the Homoptera. A review of the numerous 

 figures I have given in tins monograph relating to the 

 pygofers of the Tettigidse, in connection with wiiat 

 Dr. Sharp has written may perhaps add a little know- 

 ledge to a confessedly abstruse subject. 



Fieber in 1866 published some small, but good, 

 engraved outlines of details of the Delphacini, and he 

 there included many of the external parts connected 

 with the pygofer. In 1869 these engravings were con- 

 tinued throughout the European Deltocephali and the 

 small Jassidae. Much importance w^as given by him to 

 the forms of the styles in the males, and these adjuncts 

 have been since employed for specific diagnosis. 



I believe that most of the genital parts noted by 



