Abstract ........................................................ 1
Introduction .................................................... 1
Materials of the Steninae treated ............................... 3
Methods of the Dissection for Observation and Illustration ...... 4
Characters Used for the Taxonomy of Steninae .................... 5
Methods of descriptions and illustrations ...................... 20
History of Taxonomic Studies on the Japanese Steninae .......... 21
Steninae fauna of Japan ........................................ 24
Descriptions ................................................... 25
Genus Dianous Leach, 1819 ...................................... 25
Species group of D. Calceatus Puthz ......................... 27
Species group of D. Chinemis Bernhauer ...................... 30
Species group of D. Soerulescens Gyiienhal .................. 32
Genus Stenus Lateille, 1797 .................................... 42
Species group of S. comma LeConte ........................... 45
Species group of S. seminiger Champion ...................... 65
Species group of S. clavicornis (Scopoli).................... 68
Species group of S. humilis Erichson ....................... 105
Species group of S. circularis (Gravenhorst) ............... 165
Species group of S. javanus Cameron ........................ 167
Species group of S. palposus Zetter'stedt .................. 170
Species group of S. melanarius Stephens .................... 172
Species group of S. canaliculatus Gyiienhal ................ 177
Species group of S. incanus. Erichson ...................... 183
Species group of S. gibbicollis Sahlberg ................... 187
Species group of S. crassus Stephens ....................... 200
Species group of S. opticus Gravenhorst .................... 212
Species group of S. pubescens Stephens ..................... 214
Species group of S. pallitarsis Stephens ................... 217
Species group of S. flavipes Stephens ...................... 224
Species group of S. piliferus Motschulsky .................. 231
Species group of S. rorellus Fauvel ........................ 243
Species group of S. similis (Herbst) ....................... 248
Species group of S. cylindricollis Boheman ................. 266
Species group of S. coelogaster Champion ................... 275
Species group of S. wasmanni Fauvel ........................ 277
Species group of S. pulcher Motschulsky .................... 279
Species group of S. bispinus Motschulsky ................... 283
Species group of S. alpicola Fauvel ........................ 285
Species group of S. virgula Fauvel ......................... 290
Species group of S. abdominalis Fauvel ..................... 293
Species group of S. sharpi Bernhauer et Schubert ........... 310
Species group of S. gestroi Fauvel ......................... 313
Species group of S. guttalis Fauvel ........................... 316
Acknowledgements .............................................. 319
References .................................................... 320
Habitus Figures ............................................... 330
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