Anatomy of the Male Genital Tube in Coleoptera. 563 
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 without trace of cap-piece. Internal 
sac long, with apical armature consisting of a twisted chitin plate 
(a) through which the ejaculatory duct runs, and opens on its 
apical edge (207a). Beyond (basally) the sac the duct forms a long 
chitinous 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 Kumolpidae would be very 
interesting. In Chrysochus pretiosus this stenazygos (or 
pseudostenazygos) is quite as slender as in Hwmolpus. 
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 (Pl. LX XIII 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, 
