504 Mr. D. Sharp and Mr. F. Muir on the Comparative 
at base, the apex slightly curved. The basal-piece consists of two 
small narrow sclerites, attached to the base of the lateral lobes, 
but they do not meet on the dorsal side. 
Necrophorus mortuorum (Pl. L fig. 51). 
Median lobe chitinous on ventral and lateral aspects, membranous 
on dorsal aspect ; median orifice large, on dorsal aspect of apex ; 
median foramen small, on ventral aspect about one-fourth from 
base. Lateral lobes broad at base, tapering to blunt point, bearing 
several hairs, Basal-piece (bp) slender and ring-shaped. Internal 
sac large, but details not examined. 
Astagobius angustatus. 
The median lobe large, slightly flattened and curved ; the median 
orifice on the ventral face of apex, the dorsal edge being pointed ; 
median foramen large, at base. Lateral lobes long and thin ; basal- 
piece formed by a small curved sclerite on ventral face, but not 
meeting on dorsal. Internal sac large, armature not observed. 
Bathyscia, sp. (Pl. L figs. 52, 52a). 
Median lobe tubular, slightly flattened towards apex on dorsal 
face where it graduates to a point ; median orifice at apex on dorsal 
face ; median foramen (mf) at base, as large as the diameter of 
the median lobe, the edge being strengthened by a thickening of 
the chitin (a). The tegmen consists of a broad ring-shaped basal- 
piece (bp) with a pair of thin lateral lobes lying along each side of 
the median lobe, the basal-piece being slightly posterior of the base 
of the median lobe. Internal sac large, extending through the 
median foramen, Arising from the apex of the sac is a short, stout 
flagellum (c), along which the ejaculatory duct continues and opens 
at its tip. The dorsal face of this flagellum is chitinous (a) and 
broadened at the base where the corners articulate with a Y-shaped 
(y) support (Jeannel’s Y-piece) ; the ventral face of the flagellum is 
membranous, except at the tip where the chitin forms a short fine 
tube.* Fig. 52a represents the internal flagellum (c of fig, 52) on a 
much higher scale of magnification. 
Liodes humeralis (Pl. L figs. 58, 53a, 53b) is of the same type 
as Bathyscia. 'The median lobe is chitinous, strongly bent at the 
basal third, swollen at base and pointed at apex; the median orifice 
is at apex on ventral face; the median foramen at base, and as large 
as the enlarged base of median lobe. The tegmen consists of a 
* On this group reference may be made to an important memoir 
by Jeannel, Arch. Zool. exp. v, 1910. 
