Anatomy of the Male Genital Tube in Coleoptera. 509 
Humicrus tarsatus (Pl. LVII fig. 57). 
Median lobe tubular, slightly curved, with large median orifice at 
distal end and small median foramen at base. Lateral lobes large, 
broad and closely pressed to sides of median lobe; they extend 
beyond the end of the median lobe where the tips are consolidated 
into a single point, entirely enveloping the ventro-apical portion of 
the median lobe. Although the lateral lobes are pressed very closely 
to the median lobe, yet they are not consolidated thereto, and can 
be parted without damage. Internal sac small with a curved chitinous 
process (a) bearing the opening of the ejaculatory duct at its tip. 
Leptomastax coquerelt. 
Median lobe similar to Ewmicrus tarsatus; the lateral lobes are 
broad and flat but do not meet and become consolidated at their 
tips. Internal sac small, with a chitinous process ending in a short 
flagellum on which the ejaculatory duct opens. 
The family Scydmaenidae exhibit a great diversity of 
form, but all appear to be of one type. Median lobe more 
or less tubular with a large median orifice and a small 
median foramen more or less inclined to the dorsal face. 
The lateral lobes articulated to the base of the median 
lobe on the dorsal face of the median foramen. Internal 
sac bearing armature. The point of articulation being on 
the dorsal side of the median foramen distinguishes this 
family from the Staphylinidae wherein the point of 
articulation is on the ventral side. 
The distinguished French entomologist, M. de Peyerim- 
hoff, has published a memoir on the male structures of 
Scydmaenidae, in which he expresses the opinion that the 
structures are in some species variable. We would point 
to our remarks under Stenichnus collavis as possibly 
explaining the discrepancies he remarks on. 
Family PSELAPHIDAE. 
Forms examined: Sagola sp. (not in Brit. Mus.), New 
Zealand. Trichonyx sulcicollis Reich., Brockenhurst. Bry- 
axis impresst Panz., and B. jwncorum Leach, Brockenhurst. 
Physa inflata Sharp, New Zealand. Palimbolus sp. (not 
in Brit. Mus.), New South Wales. 
Figs. 58, 59, 60 and 230 Pls. LI and LII. 
TRANS, ENT. SOC. LOND. 1912.—PARY III. (DEC.) MM 
