Anatomy of the Male Genital Tvhe in Colcojitera. 525 



Avitlidrawn into the body cavity. The tegmen is similar to Lasia, 

 but more slender, the strut being fastened at its end to the expanded 

 base of the median lobe. Internal sac undifferentiated and opening 

 at apex of median lobe. 



In CoGcidnla riifa the median lobe is also very thin and long and 

 withdrawn into the abdonen. 



In Leis 22-maculata the median lobe is shorter and thicker than 

 in 31. oblongo-guttata and Coccidula, but not so stout as in Lasia. 



This interpretation differs from Verhoeff's. He con- 

 siders our median lobe as a siphon (equal to our flagellum 

 in Caonptocao'pus and many other forms), and a part of our 

 tegmen (a) as the penis, or median lobe. Lasia globosa 

 supports our view. But even if Verhoeff's interpretation 

 should prove to be correct it would not justify the placing 

 of this family apart from all other Coleoptera ; the " siphon " 

 would merely be a structure analogous with our flagellum 

 in so many families. 



Weise has given some figures of the aedeagus of Coc- 

 cinellidae (Deutsche ent. Zeitschr. 1896 Taf. i p. 368). 

 According to our observations there is a duct within the 

 part he figures as being the duct. 



From observation of the copula of two or three species 

 of Coccinellidae we find that the lateral lobes occupy a 

 purely external position on the venter of the female. 



Family ENDOMYCHIDAE. 



Forms examined : Endomychus coccineus L., England. 

 EumorpJius aff. profani (Brit. Mus. Coll.) and E. aff. 

 tetrasjnloti Hope, both from Borneo. Also Troehoideus 

 dcsjardinsi Guer., Malay Arch., which is usually, though 

 we think erroneously, placed in Endomychidae. 



Figs. 113, 114, Ph LXI ; 185, 185rt, PI. LXX. And 

 Troehoideus, figs. 184, 184«, PL LXX. 



Endomychus coccineus (PI. LXX fig. 185). 



Median lobe well chitinised, tubular, curved and slightly twisted 

 laterally, the ventral edge of the lobe projecting far beyond the 

 dorsal edge, thus making the median orifice on the dorsal face 

 at apex. Internal sac short, the basal part generally protruding 

 through the orifice, with a stout flagellum arising {fg) from the apex. 

 Tegmen in form of a small cap-piece (a) on dorsal aspect of median 

 lobe, with a broad irregular strut (6) on ventral face. 



TRANS. ENT. SOC. LOND. 1912, — PART III. (DEC.) NN 



