Figure

Fig. 18.3. Immature stages of Hydrochidae, genus Hydrochus (on non-Australian species). A–B, general habitus (A, first instar of H. rufipes Melsheimer; B, third instar of H. angustatus Germar). C–D, anterior margin of head (C, H. crenatus (Fabricius); D, H. megaphallus Berge Henegouwen). E, head of H. crenulatus in dorsal view; F–G, head in ventral view (F, H. megaphallus; G, H. angustatus). H–J, mandible (H, H. angustatus; I, H. crenatus; J, H. rufipes). K–M, head appendages of H. megaphallus (K, antenna; L, maxilla in dorsal view; M, mentum and prementum in dorsal view); N, abdominal apex of H. rufipes. O, egg case of H. squamifer LeConte. P, metathoracic leg of H. angustatus. A, J, N–O from Archangelsky (1997).