Anatomy of the Male Genital Tube in Coleo'ptera. 567 



dorsal edge ; chitinisation of tlie dorsal edge forming three strips 

 which close the orifice; median foramen occupying the ventral 

 portion of the basal fourth. Tegmen Y-shape without traces of 

 cap-piece. Internal sac fair size with armature that appears to be 

 comparatively simple. 



Although the aedeagus in Halticinae is much used for 

 discriminating the species, we have not met with any 

 satisfactory account of it ; the sac, with its armature, the 

 base of the median lobe, and the foramen, as well as the 

 condition of the tegmen, being in fact almost entirely 

 neglected. 



S^ilispa imperialis (PI. LXXIV fig. 213). 



Median lobe well developed and chitinised, strongly bent at about 

 two-thirds from apex, bent up at right angles at the curve, with the 

 median foramen occupying the ventral portion ; median orifice with 

 ventral edge rounded and produced beyond dorsal edge. Tegmen 

 T-shaped, with the forks of the T embracing the median lobe. 



Cephaloleia sp. ? (PI. LXXIV fig. 214). 



Median lobe tubular, strongly curved, with ventral edge of median 

 orifice pointed and projecting far beyond the dorsal edge ; median 

 foramen occupying the ventral portion of the basal third. Tegmen 

 Y-shape. Internal sac long, passing through the median foramen ; 

 nature of armature not observed. 



Mesomplialia pascoei (PI. LXXIV figs. 215, 215a). 



Median lobe long, thin, tubular and flattened slightly, curved nearly 

 at right angles about one-fourth from Ijase and deeply constricted ; 

 median foramen occupying the ventral portion of the basal fiftli ; 

 ventral edge of median orifice pointed and projecting well beyond 

 dorsal edge. Tegmen Y-shaped. Internal sac not large, bearing at 

 apex a flattened tube like flagellum {fg), on which the ejaculatory 

 duct opens, and a plate embedded in the sac below (a). The 

 ejaculatory duct in this species is semi-chitinous, and forty-eight 

 millimetres long. 



Aspidomorpha 4<-maculata (PL LXXIV fig. 21 G). 



Median lobe stout, tubular and bent at forty-five degrees two-fifths 

 from base ; median orifice with ventral edge bluntly pointed and 

 only produced a little beyond dorsal edge ; median foramen occupying 

 ventral part of basal fifth. Tegmen Y-shape. Internal sac without 

 armature. 



