Anatomy of the Male Genital Tube in Coleoptera. 543 
along the basal half; two well developed median struts. Lateral 
lobes large, meeting at their bases both ventrally and dorsally, 
excavate on inner side so that they envelop the median lobe (in figure 
they are shown apart so as to expose the median lobe). Basal-piece 
large shield-shape, membranous on the dorsal aspect. Internal sac 
undifferentiated. 
Dascillus cervinus (Pl. LXVI fig. 152). 
Median lobe complex, consisting of two parts ; dorsally a large flat 
sclerite, bluntly rounded at tip with the sides turned down (a), with 
two short struts at base ; ventrally a smaller sclerite pointed and 
curved downward at tip (b) with a pair of basal struts and a strong 
raised piece in the centre at base (c); the ejaculatory duct opens at 
the base of these two sclerites. Lateral lobes large, curved, nearly 
meeting at their bases on ventral aspect, where they are articulated 
to the central raised piece (c) of the median lobe, but somewhat 
apart on the dorsal aspect, where they are articulated to the edges 
of the dorsal plate (~) near its base. Basal-piece well developed 
on the ventral aspect. Internal sac undifferentiated. When the 
median lobe is thrust forward during copulation the lateral lobes 
open laterally, the dorsal plate of the median lobe turns up dorsally, 
and the ventral piece turns ventrally, the median orifice then lies 
at the bottom of these organs. 
The Dascillid male is a trilobe type and at present 
we cannot connect it with the Malacodermidae turther 
than by the approximation that occurs in simple forms 
(ef. Drilus and Dictyopterus). 
Family CYPHONIDAE. 
Forms examined: Microcara (or Helodes) livida Fabr., 
England. Cyphon coarctatus Payk., England. 
Figs. 187 and 188 Pl. LX XI. 
Mrcrocara livida (Pl. LX XI fig. 187). 
When the aedeagus is extended there are nine distinct tergites, the 
anus lying below the ninth tergite ; the first two sternites are obscure 
and lie beneath the last coxae, the third being the first visible seg- 
ment; the eighth and ninth are distinct. The aedeagus comprises 
all the structures that lie between the anus and the ninth sternite. 
Basally the aedeagus consists of a large bilobed plate on the dorsal 
side, continued on the ventral side as a membrane (the tegmen) (ty); 
this ensheathes the median portion, which consists of a trilobed body, 
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