Anatomy of the Male Genital Tube in Coleoptera. 525 
withdrawn into the body cavity.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 Coccidula rufa 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withdrawn into the abdonen.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 M. 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 Camptocarpus and many other forms), and a part of our 
tegmen (a) as the penis, or median Jobe. Lasia globosa 
supports our view. But even if Verhoeft’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: Hndomychus coccineus L., England. 
ELumorphus aff. profani (Brit. Mus. Coll.) and #. aff. 
tetraspilott Hope, both from Borneo. Also Trochoideus 
desardinst Guer., Malay Arch., which is usually, though 
we think erroneously, placed in Endomychidae. 
Bigs. Us, 1i4;/PL LX1; 185; 1850; Pr bxXxX. And 
Trochovdeus, figs. 184, 1842, Pl. LXX. 
Endomychus coccineus (P]. 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 (b) on ventral face. 
TRANS. ENT. SOC, LOND. 1912.—PART III. (DEC.) NN 
