Anatomy of the Male Genital Tithe in Coleoptera. 503 



of a broad curved piece on the dorsal side, the ventral part being 

 occupied by the median foramen ; between the distal third and the 

 basal two-thirds there is a strong constriction. The tegmen consists 

 of a Y-piece, with a long strut on the ventral aspect and only- 

 membrane on the dorsal, and witliout trace of cap-piece. Internal 

 sac long, with apical armature consisting of a twisted chitin plate 

 (a) through which the ejaculate ry duct runs, and opens on its 

 apical edge (207a). Beyond (basally) the sac the duct forms a long 

 cliitinous tube, four times the length of the aedeagus, and then 

 enlarges somewhat so as to become a slender chitinous chamber. 



This is very remarkable on account of the extreme 

 elongation of the stenazygos. Apparently this part, which 

 is at least four or five times as long as the eurazygos, is 

 also made as slender as possible. It is difficult to say 

 whether it is not rather an altered part of the eurazygos 

 than a specialisation of the duct. 



It may possibly function as a flagellum, invaginated 

 during inactivity. A thorough examination of this struc- 

 ture and its function in Eumolpidae would be very 

 interesting. In Chrysochus pretiosvs this stenazygos (or 

 pseudostenazygos) is quite as slender as in Eumolpus. 



Glyptoscelis cuprascens. 



Median lobe well developed and chitinous, bent at right angles 

 about middle, the distal half forming a flattened tube, with the 

 ventral edge of the median orifice drawn out beyond the dorsal 

 edge and pointed; the median foramen placed on the ventral 

 aspect of the basal half. The dorsal face of the basal half cleft 

 down the centre making it into two struts. Tegmen forming a 

 broad shield-shaped sclerite, the apex of the shield being attached 

 to the median lobe and the wide part extending ventrally, not 

 meeting on dorsal side of median lobe and having no trace of 

 cap-piece. Sac and stenazygos not examined. 



Orina elongata (PI. LXXIII fig. 209). 



Median lobe well developed and chitinised, curved, tubular, with 

 the ventral edge of the median orifice drawn out to a point greatly 

 beyond the dorsal edge, thus placing the median orifice on the dorsal 

 aspect; median foramen smaller than in Eumolpinae, etc., occupying 

 only the basal sixth of the ventral aspect. Tegmen consisting of a 

 small V-shaped sclerite, not meeting on dorsal aspect and showing no 

 trace of cap-piece. Internal sac of moderate size, with a strongly 

 chitinised flagellum on which the ejaculatory duct opens. 



