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 
AGLYCYDERIDAE 
PROTERHINIDAE CHRYSOMELIDAE 
ANTHRIBIDAE BRUCHIDAE 
CURCULIONIDAE 
SCOLYTIDAE 
PARAN DRA 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 Phyllodecta to see a 
comparatively rudimentary, or vestigial, condition of the base of 
the median lobe. 
TRANS. ENT. SOC. LOND. 1912.—PART II. (DEC.) TT 
