Anatomy of the Male Genital Tube in Coleoptera. 573 
Crossotarsus barbatus (Pl. LXXVII fig. 228). 
Median lobe forming a strong chitinous tube with the median orifice 
at the apex and the median foramen occupying the ventral basal 
third. Tegmen forming a Y-piece. Internal sac not examined. 
Family BRENTHIDAE. 
Forms examined: Baryrrhynchus miles Boh., India. 
Arrhenodes funebris Sharp, Panama. 
Fig. 227 Pl. LXXVILI. 
Baryrrhynchus miles Boh. (fig. 227). 
Median lobe forming a tube for the apical two-fifths, chitinous on 
dorsal and ventral aspects; the dorsal sclerite prolonged into two 
wide struts at the base (ms). Tegmen forming a ring, with a pair 
of large, rounded lobes, forming one piece basally, on the dorsal aspect 
and a long ‘strut-like basal-piece ventrally. Internal sac long, 
projecting beyond the base of the median nee and armed with a 
long, slender, chitinous flagellum (fy, fig. 227) about 12 mm. long, 
and ‘006 mm. in diameter towards its tip; the opening of the 
ejaculatory duct is at the tip of the flagellum, 
We have examined various other Brenthidae, and as far 
as we have observed, this family is very uniform, differing 
in the size and shape of the cap-piece, of the median lobe, 
flagellum, etc.; but all possess the flagellum, and the 
division of the cap-piece is never missing. In Baryr- 
rhynchus robustus Jek., the lobes are slender rods, bearing 
hairs at the tip, but are quite distinct. 
Family LUCANIDAE. 
Forms examined: Chiasognathus granti Steph., Chile. 
Neolamprima adolphinae Gestro, New Guinea. Lucanus 
cervus L., England. Systenus (formerly Platycerus) cara- 
boides i Bosnia. Figulus marginalis Rits., Borneo. F. 
striatus Ol. Seychelles. Syndesus cornutus Fabr., Tas- 
mania, Ceratognathus niger Westw., Tasmania. Mito- 
phyllus irroratus Parry, and M. parryi Westw., New 
Zealand.  Aesalus scarabacoides Panz., Europe. Nicagus 
obscurus Lec., N. America. Sinodendron cylindricum L., 
Brockenhurst. 
Figs. 5-10a Pls. XLII and XLII. 
Ceratognathus niger (Pl. XLII fig. 5). 
The median lobe is long, tubular, with median orifice at tip and 
TRANS. ENT. SOC. LOND. 1912.—PART III. (DEC.) QQ 
