Anatmny of the Male Genital Tuhe in Cole&ptera. 579 



piece as long as the median lobe, forming a broad, flattened chitinous 

 tube bent downward near the base. Internal sac small witli fine 

 hairs, but no chitinous armature. 



Remarks on Trogidae. — The chitinous large median lobe 

 and the comparatively simple internal sac separate the 

 Trogidae from the Copridae s. h. ; 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 Trox sp. ? No. 1, approximates to 

 Mito'phylhis and other allied Lucanidae, while T. omacan- 

 thus leans a little to the Passalid aedeagus. T. scaler 

 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 : Froeulus opacipennis Th. and P. 

 mnizechi ? Central America. Eriocnemus sp. not in Brit. 

 Mus., Mysol. Protomocoelus (Pelops) gestroi Kirsch, New 

 Guinea. Lahienus ]itox Kaup, New Guinea. Ncleus sp., 

 Amazons, Leptaulacides planus and L. vicinus (in Brit. 

 Mus. Coll.), Sarawak. Aulacocydus edentulus Macl., and 

 A. teres Perch., Australia. 



Figs. 11, 12, 13 and 13a PI. XLIV. 



Leptaidacides planus (PI. 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 (hi). Basal piece small chitinous 

 all the way round. Internal sac large, twice as long as the 

 aedeagus, with patches of brown hairs. 



Labienus p)tox (PL XLIV fig. 12). 



Median lobe very large and round, with the median orifice on 

 the dorsal aspect. Tlie lateral lobes are consolidated on the ventral 



