Fig. 61. Hydrophorus albiceps Frey
Fig. 62. Hydrophorus alpinus Wahlberg
Fig. 63. Hydrophorus balticus (Meigen) 
Fig. 64. Hydrophorus bipunctatus (Lehmann)
Fig. 65. Hydrophorus borealis Loew
Fig. 66. Hydrophorus brunnicosus Loew
Fig. 67. Hydrophorus callostomus Loew
Fig. 68. Hydrophorus freyi Storå
Fig. 69. Hydrophorus geminus Frey
Fig. 70. Hydrophorus litoreus Fallén
Fig. 71. Hydrophorus signifer Coquillett
Fig. 72. Hydrophorus nebulosus Fallén
Fig. 73. Hydrophorus norvegicus Ringdahl
Fig. 74. Hydrophorus oceanus (Macquart)
Fig. 75. Hydrophorus pectinatus Gerstäcker
Fig. 76. Hydrophorus pilipes Frey
Fig. 77. Hydrophorus rufibarbis Gerstäcker
Fig. 78. Hydrophorus viridis (Meigen)
Fig. 79. Hydrophorus altivagus Aldrich
Figs. 82 (1-5)Hydrophorus praecox (Lehmann)
Fig. 80. Hydrophorus rogenhoferi Mik
Fig. 81. Hydrophorus praecox  (Lehmann)

Figs. 61-81. Hydrophorus spp. Hypopygium, left lateral view (after Negrobov, 1977-1979).

Figs. 82 (1-5). Variation of hypopygium structures in Hydrophorus praecox Lehmann. 1-2, hypandrium, lateral view; 3-5, dorsal lobe of surstylus, ventro-lateral view (orig.).

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