498 Mr. D. Sharp and Mr. F. Muir on the Comparative 
Ocypus cupreus (Pl. LIT figs. 68, 63a, 630). 
In this form the median lobe is a strong, chitinous tube with a 
bulbous base, a semi-chitinous band (m) running round the bulb; 
the median orifice is distal; the median foramen small and ventral, 
at the junction of bulb and tube. The lateral lobes are amalgamated 
and form a broad, slightly-curved plate on the ventral aspect of the 
median lobe, the tip being slightly cleft. The internal sac large, with 
four large, round diverticula near base, covered with curved spines ; 
the dorsal side covered with long strong hairs, the ventral with large 
curved spines, similar to those on the diverticula ; the apex is drawn 
out thinner and has two constrictions near the end and the opening of 
the ejaculatory duct (0) near the tip on the ventral side is supported 
by two flat chitin sclerites ; a small spine rises just beyond it. The 
sac shown in the figure is drawn from a specimen taken in copula ; 
it had the position figured. 
Creophilus erythrocephalus, has a median lobe somewhat like 
O. cwpreus, but the lateral lobes form a single broad prong on the 
ventral face, Internal sac medium size with a short curved 
flagellum arising from apex. 
Quedius ; has a similar form of median lobe to Ocypus, and the 
lateral lobes form a single piece on its ventral side. In Q. ventralis 
(Pl. LII fig. 64) the internal sac is figured evaginated. In 
Q. brevicollis the internal sac has a pair of small diverticula near 
apex and the opening of the ejaculatory duct below them, also a 
larger pointed pair on the dorso-lateral part of the middle, and a 
round diverticulum on the ventral side near base, covered with 
semi-chitinous pegs. 
Q. vexans (of our British collections) has median and lateral lobes 
of the same type, the internal sac being swollen at base and thin for 
the distal two-thirds ; a pair of blunt diverticula arise from the side 
near the middle, and a backward-pointing one nearer the base on a 
median-ventral line. 
Pinophilus rectus (Pl. LIV figs. 71, 717). 
Median lobe large, bulbous at base, with semi-membranous strip 
(m) running across to near apex; apex with dorsal edge projecting 
beyond ventral; median orifice on ventral side of apex ; median 
foramen small, on ventral side about one-fourth from base. Lateral 
lobes thin narrow strips, articulated to median lobe on ventral 
edge of median foramen. Internal sac about 15 mm. long, thin, 
tubular, coiled up in median lobe when invaginated. Arising from 
apex of sac is a fine chitinous flagellum as long as the sac, with 
the opening of the ejaculatory duct at its tip. At the base of the 
