Anatomy of the Male Genital Tube in Coleoptera. 579 
piece as long as the median lobe, forming a broad, flattened chitinous 
tube bent downward near the base. Internal sac small with fine 
hairs, but no chitinous armature. 
Remarks on 7'rogidae.—The chitinous large median lobe 
and the comparatively simple internal sac separate the 
Trogidae from the Copridae s.b.; Cloeotus sinuatus, with 
its small but distinct median lobe comes near to them, 
but its sac is large and of a complex shape as in other 
Copridae. 
Such a form as Zyvox sp. ? No. 1, approximates to 
Mitophyllus and other allied Lucanidae, while 7’. omacan- 
thus leans a little to the Passalid aedeagus. 7’ scaber 
approaches a little to the Sinodendron type, but very 
little. 
The small family Trogidae is of great importance as re- 
gards the classification of the Scarabaeoid series of Coleo- 
ptera, and should receive a thorough anatomical study. 
We allude to it again under the heading “ Taxonomy.” 
Family PASSALIDAE. 
Forms examined: Proculus opacipennis Th. and P. 
mnizechi ? Central America, H7iocnemus sp. not in Brit. 
Mus., Mysol. Protomocoelus (Pelops) gestrov Kirsch, New 
Guinea. Labienus ptow Kaup, New Guinea, Veleus sp., 
Amazons. Leptaulacides planus and L. vicinus (in Brit. 
Mus. Coll.), Sarawak. Aulacocyclus edentulus Macl., and 
A. teres Perch., Australia. 
Figs. 11, 12, 13 and 18a Pl. XLIV. 
Leptaulacides planus (Pl. XLIV fig, 11). 
Median lobe short and round, with median orifice at end and 
median foramen at base. Lateral lobes large, rounded at their tips 
and consolidated together to their extremity on the dorsal side, but 
still showing the line of junction ; on the ventral side they meet 
together at their base where it is chitinous, and for some little 
way up where it is membranous (m). Basal piece small chitinous 
all the way round. Internal sac large, twice as long as the 
aedeagus, with patches of brown hairs. 
Labienus ptow (Pl. XLIV fig. 12). 
Median lobe very large and round, with the median orifice on 
the dorsal aspect. The lateral lobes are consolidated on the ventral 
