Anatomy of the Male Genital Tube in Coleoptera. 567 
dorsal edge ; chitinisation of the 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. 
Spilispa imperialis (Pl. LX XIV 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. ? (Pl. LX XIV 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. 
Mesomphalia pascoet (Pl. LX XIV figs. 215, 215a). 
Median lobe long, thin, tubular and flattened slightly, curved nearly 
at right angles about one-fourth from base and deeply constricted ; 
median foramen occupying the ventral portion of the basal fifth ; 
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 (fy), 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. 216), 
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. 
