Three new species of Orthocladius subgenus Eudactylocladius (Diptera: Chironomidae) from Norway Ole Saether, A. Zootaxa 2004 508 1 12 [740,949,1062,1088] Insecta Chironomidae Eudactylocladius CoL Animalia Diptera 10 11 Arthropoda genus    1. Superior volsella well developed, rounded to right­angled ........................................................ 2  ­ Superior volsella scarcely to moderately developed................................................................... 3   2 Inferior volsella well developed, bluntly triangular; dorsal part of cibarial pump wider than long; no sensilla chaetica on mid leg; Palaearctic .................................... O. ( E.) musester sp. n.  ­ Inferior volsella weakly indicated to non­existent; dorsal part of cibarial pump not as wide as long; sensilla chaeticae present on mid leg; Palaearctic ............................................................... ..........................................................................................................  O. ( E.) fuscimanus(Kieffer)   3. Inner margin of gonocoxite with strong dense setae, commencing some distance posterior of gonocoxite base, associated with weakly delimited superior volsella ........................................ 4  ­ Inner margin of gonocoxite with finer, less dense, setae, commencing closer to gonocoxite base, anterior to sometimes moderately indicated superior volsella........................................... 5   4. Gonostylus without inner projection, squama with 9–14 setae; Nearctic..................................... .......................................................................................................  O. ( E.) subletteorumCranston  ­ Gonostylus with inner, preapical, triangular projection; squama with 13–20 setae; Palaearctic. ................................................................................................................ O. ( E.) priomixtus sp. n.   5. Superior volsella moderately developed, angular; anal point strong, but not strongly sclerotised, greater than 50 mlong; ultimate flagellomere at least 500 mlong; Holarctic ............... ................................................................................................................... O. ( E.) gelidusKieffer  ­ Superior volsella scarcely developed; anal point weak to moderately developed or strong and sclerotised, usually less than 50 mlong; ultimate flagellomere often less than 500 mlong. 6   6. Anal point strong, well sclerotised; sensilla chaeticae of legs absent; Svalbard.......................... .....................................................................................................................  O. ( E.) schnelli sp. n.­ Anal point sometimes very weak to absent, never strongly sclerotised; sensilla chaeticae probably always present on mid and hind legs .................................................................................... 7  7. Gonostylus with microtrichiae on dorsal surface strong and dense, anal point sometimes very weak to absent; Nearctic .................................................................. O. ( E.) dubitatusJohannsen  ­ Gonostylus with microtrichiae on dorsal surface fine and sparse, anal point well developed .. 8   8. Gonocoxite with both volsellae distinct, particularly the superior; Holarctic .............................. ...........................................................................................................  O. ( E.) gelidorum(Kieffer)  ­ Gonocoxite without differentiated volsellae, just a gently rounded contour; Holarctic ............... ...............................................................................................................  O. ( E.) olivaceusKieffer