Anatomy of the Male Genital Tube in Coleoptera. 521 
considerable. There are several other Cucujus-forms 
(Prostomis, etc.) that we have not been able to examine, 
although they are probably taxonomically important. 
Family HELOTIDAE. 
Form examined: Helota gemmata Gorh., Japan, and a 
second species from Assam. 
Figs. 106, 106a and 1060 Pl. LX. 
Helota gemmata (Pl. LX figs. 106, 106@, 1060). 
Median lobe broad, flattened ; the ventral face forming a plate 
of which the lateral edges project slightly ; the base prolonged into 
two broad struts; median orifice at distal end. The tegmen formed 
of a large “cap-piece” on the dorsal aspect and a Y-piece on the 
ventral. The edges of the cap-piece are turned in and form a 
groove in which the projecting edges of the median lobe run. In- 
ternal sac large with complex armature at apex. This armature 
(fig. 106b) consists of a stout chitinous block (a), on the end of 
which the ejaculatory duct opens; the ventral face of this piece 
forms a shallowly curved plate (b), on the dorsal aspect are two 
curved plates, both deeply cleft at the tips (c). 
This type must be placed somewhere near the Niti- 
dulidae. It is an instance—and far from a solitary one— 
of an aedeagus within an aedeagus. 
Family OMMADIDAE. 
Form examined: Omma stanleyi Newm., Australia. 
Omma. stanleyi (P1. LIX figs. 102, 102). 
Median lobe well developed, tubular with median orifice on the 
smaller distal end and the median foramen at the larger basal end ; 
two short median struts; point of articulation on dorsal face. 
Lateral lobes large, concave on the inner surface, where this 
envelops the median lobe to near its tip, the basal part of the lateral 
lobes consolidated together. No defined basal-piece. The internal 
sac is simple and of medium size. 
In this species the anus opens at the end of a chitinous 
tube (a) which either represents the last segment (tergite 
and sternite) or a chitinisation of the rectum, more 
probably the former. 
