Anatomy of the Male Genital Tube in Colcoptera. 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. 



Dascilhis cervimis (PI. 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 (h) 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 (e) of the median lobe, but somewhat 

 apart on the dorsal aspect, where they are articulated to the edges 

 of the dorsal plate {a) 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 further 

 than by the approximation that occurs in simple forms 

 (cf. Di'ilus and Dictyopterus). 



Family CYPHONIDAE. 



Forms examined : Microcara (or Helodcs) livida Fabr., 

 England. Cyphon coardatus Payk., England. 

 Figs. 187 and 188 PI. LXXI. 



Microcara livida (PL LXXI 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 tegnien) (/f/) ; 

 this ensheathes the median portion, which consists of a trilobed body, 



OO 2 



