Anatomy of the Male Genital Tube in Coleoptera. _ 545 
abnormal family by the aid of some of the larger and less 
delicate exotic forms, of which we should be very glad to 
receive examples. 
Family RHIPICERIDAE. 
Form examined : Callirrhipis philiberti, Seychelles. 
Fig. 153 Pl. LXVI. 
Callirrhims philiberti (figs. 153, 153). 
Median lobe large, formed by a large sclerite (a) on dorsal face, 
narrow at apex which is slightly cleft, widening towards the base, 
which is continued into two median struts, and a slender chitin rod (b) 
on the ventral face, the sides being membranous. Lateral lobes large, 
pointed at apex, and widening at base where they consolidate together 
on the ventral face and just touch on the dorsal. Basal-piece large 
membranous on dorsal aspect and in the centre of ventral 
aspect and with a chitinous support round the ventral. Internal 
sac undifferentiated, but the duct is greatly enlarged just beyond 
the aedeagus (ej). 
This is an Elaterid type. 
Family ELATERIDAE. 
Forms examined: Agrypnus sp. ? New Guinea. <Ani- 
somerus hacquarti, Mashonaland. Chalcolepidius albertisi 
Cand., Honolulu. 
Figs. 154, 155 and 156 Pls. LXVI and LXVII. 
Agrypnus sp.? (Pl. LXVI fig. 154). 
Median lobe formed by a broad sclerite (a) on dorsal face pointed at 
tip, and with two struts at base, and a small chitin rod (b) on ventral 
face, the sides membranous ; median orifice large, on ventral aspect 
near tip. Lateral lobes large, enveloping the median lobe. Basal- 
piece well developed, membranous on dorsal face, and in centre 
on ventral face (m) with chitin (bp) round the edges, Internal sac 
undifferentiated, with dilated duct basal to aedeagus. 
Anisomerus hacquarti (P], LX VII figs. 155 and 155a), 
Asymmetrical trilobe form. Median lobe small, with median orifice 
at tip and two small struts at base. Lateral lobes large, the right longer 
and broader than left, consolidated at their basal part into a tube. 
Basal-piece very small. Internal sac undifferentiated, the duct 
dilated basal to the aedeagus. 
