Anatomy of the Male Genital Tube in Coleoptera. 491 
Rhysodes sp.? (Fig. 36). 
Median lobe a strongly chitinised, curved tube, with median 
orifice on ventral side of apex and median foramen at basal end. 
Lateral lobes asymmetrical, the right large, flat and subtriangular, 
the left small and irregularly oval. Internal sac well developed, 
a large lobe arising from the apex armed with patches of hairs and 
chitin plates. 
This is a characteristic Caraboid type and must be placed 
near that family. 
Family PELOBIIDAE. 
Pelobius tardus Herbst, from Brockenhurst has been 
examined. 
Fig. 40 Pl. XLIX. 
Pelobius tardus (Pl. XLIX fig. 40). 
Median lobe strong, curved, somewhat flattened, produced into 
blunt barb at tip, with a shallow groove along the ventral side (or 
the lateral edges turned down ventrally), a membranous tongue 
(a) covers the basal four-fifths of the groove, the median orifice 
being covered by this tongue. Lateral lobes large, produced into 
filament at apex ; articulated to median lobe on dorsal side ,of base. 
Basal-piece forming a T-shape sclerite, with a large head. No 
differentiated sac. 
Family HALIPLIDAE. 
The form examined is the common European H. fulvus 
Fabr. 
Fig. 39 Pl. XLVIII. 
Haliplus fulvus (Pl. XLVIII fig. 39). 
Median lobe a flattened curved body, deeply grooved along the 
ventral side, with a membranous tongue (a) covering the basal 
three-fourths of groove; the basal part expanded, with lateral lobes 
articulated to dorsal edge. Lateral lobes asymmetrical, left one short 
and broad, with hairs on inner surface near distal end ; right lobe 
longer and narrower, with slender tip, inner surface covered with 
long fine hairs. Basal-piece forming a wide V-shape sclerite joining 
lateral lobes across the ventral side. No differentiated sac. 
