Anatomy of the Male Genital Tube in Coleoptera. 621 



to two chief points ; the reduction of the tegmen to a 

 small Y- or V-shaped piece, concomitant with the develop- 

 ment of the median lobe into a perfect, rigid tube (cf. 

 Orina), enclosing the sac either entirely or to a large 

 extent. The Bruchidae, as at present constituted, are 

 scarcely distinct from the Chrysomelid Sagra, In the few 

 Anthribidae we have examined there is no appearance of 

 a division of the dorsal portion of the tegmen. 



A development, parallel with that sketched in Chry- 

 somelidae, occurs in Curculionidae and Scolytidae, so far 



CERAMBYCIDAE 

 BRENTHIDAE 



fAGLYCYDERIDAE 

 I PROTERHIMDAE 



ANTHRIBIDAE 

 CURCULIONIDAE 

 SCOLYTIDAE 



CHRY50MELIDAE 



BRUCHIDAE 



ORSODACNE 



PARANDRA FORM 

 ? PRIMITIVE CUCUJID FORM 



AFFINITIES OF THE PHYTOPHAGOIDEA 



as the reduction of the tegmen to a Y-piece is concerned. 

 This character is strongly marked in Platypus, which may 

 be treated as an extreme form of Scolytidae, though it is 

 not included therein by Lindemann. 



Aglycyderidae and Proterhinidae will probably prove 

 not to be separable as distinct families. They are, how- 

 ever, a very interesting form. Though we have placed 



rightly apprehend his meaning as to " Penisstiitze " in connection 

 with Timarcha we cannot in that case adopt his view ; two separate 

 median struts not only exist in Timarcha, but in T. geniculata, at 

 any rate, are highly developed. Examine Phyllodeda to see a 

 comparatively rudimentary, or vestigial, condition of the base of 

 the median lobe. 



TRANS. ENT. SOC. LOND. 1912. — PART III. (DEC.) TT 



