等蜉属(Isonychia)等蜉亚属(Isonychia sensu stricto)两新种(蜉蝣目:等蜉科)

Two new species of Genus Isonychia subgenus Isonychia sensu stricto(Ephemeroptera:Isonychiidae)

本文报导等蜉属(Isonychia,Eaton)等蜉亚属(Isonychia s.s.)两新种,贵溪等蜉(Isonychia guxiensis sp.nov.)和中华等蜉(Isonychia sinensis sp.nov.).并对新种形态特征作了详细描述。

This paper describes two new species of mayflies of genus Isonychia subgenus isonychia s.s.from Kiangsi province.The type specimens are diposited in the Department of Bilolgy,Nanjing Normal University. Isonychia guixiensis sp.nov.(figs.1-9) Male imago(in alc.):Body 13-13.5 mm long,general colour reddish brown.Compound eyes large and contiguous dorsally.Fore wing 12.5mm long, almost colorless and hyaline,vein yellowish and stigmatic area dull white.MA forked beyond the middle.CuA 4 branched and two unbranched veins to the margin.Vein MP of hind wing forked near margin.Coxa of legs reddish brown, fore femora and tibia brown,tarsi ycllowish or paler,distal end dark brownish, tarsus Ionger than tibia,tarsal joints rank 1,2,3,4,5.Middle and hind legs pale.Abdomen reddish brown,terga 2-9 with a pair“八”shaped streaks.Forceps 4 segmented,second segment,longest,third longer than the terminal.Two ter- minal segmenta together slight longer than the third segment.penial lobes separate, plate like,apical margin slightly obligue,and with a small projection at the base of penis lobe,Caudal filaments two in number,median one very short and rudi- mentary. Famale imago(in alc.):Body 13 mm long.General colour lightly than the male.Legs as colored as male.In the fore leg,tibia longer than the tarsus,tarsal joints rank 1,5,2,3,4.Subanal plate with a slightly deep concavity. Holotypc:♂,Allotype:♀,Guixi,1990.Ⅵ.4,Paretypes:10♂♂,11♀♀, Guixi, 1)90.Ⅵ.4-6. Isonychia sinensis sp.nov. (figs.10-18) Male imago (in alc.):Body 14-14.5mm long,general colour reddish brown.Fore wing 13 mm long,hind wing 5.5mm long.Wings hyaline and stigmatic area dull white.MA forked beyond the middle. CuA 3 branched and four unbranched veins to the margin.Vein MP of hind wing forked near margin Coxa of legs reddish brown, fore fcmora and tibia brown,tarsi yellowish or paler,tarsus longer than tibia,tarsal joints rank 1,2,3,4,5.Abdomen reddish brown.A pair of pale middorsal stripe on terga 2-9.Forceps 4 segmented, second segment the longest,third segment longer than the terminal.Pencal lobe sparate,apical portion truncate and with a pair projection at the base of penial lobe. Female imago (in alc.):Body 13-14 mm long,general colour brownish.Fore wing 15 mm.Hind wing 6.5mm.Legs as colored as male.In the fore leg,tarsal jointsrank 1,5,2,3,4.Subanal plate with deep concavity. Holotype:♂,Allotype:♀ Guixi,1990.Ⅵ4,Paratypes:5♂♂,12 ♀♀, Guixi,1990.Ⅵ.4-6.