Anatomy of the Male Genital Tuhc in Cokoptera. 521 



considerable. There are several other Cucujus-forins 

 {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, 106« and 1065 PI. LX. 



Helota gemmata (PI. LX figs. 106, 106r^ 106&). 



Median lobe broad, flattened ; the ventral face forming a ^ilate 

 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. 1066) 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 (6), 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 (PI. LIX figs. 102, 102ff). 



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 siirface, where this 

 envelops the median lobe to near its tiji, 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. 



