Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 86. (Budapest 1994)

Makhan, D.: Thirty-five new Hydrochus species from the Old and the New World (Coleoptera: Hydrophilidae)

Description (holotype male): Body elongate, length 2.8 mm, width 1.0 mm (one male 3.1 mm long). Dorsal side shining, colour of head pronotum, scutellum and elytra greyish coppery and with a blue-green metallic gloss. Head with dense, fine punctures. Pronotum as long as wide, lateral side smooth. Disc with five large shallow depressions. Anterior margin of pronotum with three depressions, one at the centre, two behind this. Posterior margin with two depressions. Elytral length 1.8 mm, elytra widest on posterior third, lateral side smooth, striai punctures wider than interstriae. 3rd,5th and 8th interstriae carinate in almost whole length, tubercle absent. Apical holes absent. Elytral apices rounded. Male genitalia (Fig. 20): Basal piece long, páraméra longer than median lobe. Etymology: This species is named after my friend KUNARAJAH NADESU. This species seems to be allied to H. austrolis BLACKBURN, 1898 from Australia, but there is a difference in the shape of male genitalia: median lobe in H. australis widened to apex (BLACKBURN 1898), in H. nadesui narrowed to apex. Hydrochus kunarajahi sp. n. (Fig. 21) Holotype: male. Australia, Tulley Falls, 10.III. 1956, J. L. GRESSITT (only the holotype) (Bishop Mus.). Description (holotype male): Body elongate, length 3.1 mm, width 1.1 mm (one male 2.3 mm long). Dorsal side shining. Colour of head black, colour of pronotum, scutellum and elytra brown and with a blue-green metallic gloss. Head with sparse, fine punctures. Pronotum longer than wide, lateral side with granules. Disc with 6 large deep depressions. Anterior margin of pronotum with three depressions, one at the centre, two behind this. Posterior margin with three depressions. Elytral length 1.6 mm, elytra widest on posterior third, lateral side smooth, striai punctures coarse, wider than interstriae, 3rd and 5th interstriae carinate in almost whole length, tubercle absent. Elytral apices rounded. Apical holes absent. Male genitalia (Fig. 21): Basal piece long, páraméra longer thanmedian lobe. Etymology: This species is named after my friend KUNARAJAH NADESU. This species is similar to H. rambarani sp. n., but there is difference in the shape of male genitalia, median lobe wide in H. rambarani, in H. kunarajahi narrow. Hydrochus rambarani sp. n. (Fig. 22) Holotype: male. Australia, N. S. Wales (collector and date unknown) (only the holotype) (Mus. Brussels). Description (holotype male): Body elongate, length 3.4 mm, width 1.2 mm. Dorsal side shining. Colour of head, pronotum, scutellum and elytra black and with a blue-green metallic gloss. Head with dense, fine punctures. Pronotum longer than wide, lateral side smooth. Disc with five large deep depressions. Anterior margin of pronotum with three depressions, one at the centre, two behind this. Posterior margin with two depressions. Elytral length 2.1 mm, elytra widest on posterior third, lateral side with fine granules, striai punctures wider than interstriae, interstriae flat. Tubercle absent. Apical holes absent. Elytral apices rounded and broadened.Male genitalia (Fig. 22): Basal piece long, parameres longer thanmedian lobe. Etymology: This species is named after my nephew CHATTERPAL RAMBARAN. This species was labeled by KNISCH as H. parallelus BLACKBURN, 1898 from Australia. In H. parallelus páraméra are widened to apex. In H. rambarani páraméra narrowed to apex. Hydrochus radjiei sp. n. (Fig. 23) Holotype: male. Australia Tully Fall, 10.111.1956, J. L. GRESSITT (only the holotype) (Mus. Brussels).