OQ2 [December, 



ON TWO NEW AND SOME OTHER JAPANESE SPECIES OF 

 EPREMERIDM. 



BY THE EEY. A. E. EATON, M.A., F.E.S. 



The two new species described below were acquired by Mr. 

 McLachlan from the collections formed by the late Mr. H. J. S. Pryer 

 in Japan. With them were certain undescribed conditions of already 

 known species, and also specimens belonging to the genera Ephe- 

 mereUa, Ghirotonetes, Iron, Heptagenia, and Ecdijurus, mostly in the 

 sub-imago stage, and it is, therefore, not desirable to give descriptions 

 of them ; they are here mentioned in connection with the generic 

 distribution of EpliemeridcB. 



Ephemera steigata, sp. nov. 



Imago (dried), S • Rather similar to the European E. vulgata. Wrings trans- 

 parent light brownish piceous-grey, with pitch-black neuration (or, where the 

 nervures are most attenuated, pitch-brown), margined very narrowly with pitch- 

 brown ; fore-wing with a narrow transverse pitch-brown stripe, extending from the 

 costa to the anterior branch of the pobrachial nervui'C, and emitting an acute 

 projection about the middle into the axil of the fork of the prsebrachial nervure ; 

 the sub-marginal area pitch-brown towards the base. Hind-wing narrowly tinted 

 with pitch-brown along the terminal margin, and sometimes with a light pitch-brown 

 spot in the middle on cross veinlets that meet the cubitus opposite the fork of the 

 sector. iJody pitch-brown j a stripe along each side of the pronotum, and in seg- 

 ments 1 — 6, or 7, of the abdomen a right-angled triangular spot pointing forwards 

 on each side of the dorsum of the segment, pitch-black. Ventral segments striped 

 obliquelj' with black from the posterior lateral angles to near the middle of the base. 

 Fore-leg pitch-black, towards the base of the femur browner ; trochanter and coxa 

 light pitch-brown. Hinder-legs dull yellowish-amber colour. Seta; pitch-brown ; 

 the jomings slightly darker. 



$ . Very similar ; no ' spot in the hind-wing ; fascia in the fore-wing almost 

 broken up into spots ; wing membrane only very faintly tinted. 



Sub-imago. Not notably different from the imago, excepting in the dulness of 

 the wing. 



Length of body, $, 15 — 18 mm. j $, 20 mm. j wing, (J, 17 — 19 mm.; ?, 

 22 mm. j setae, J im., about 40 mm. ; ? , about 26 mm. ; sub-im., J , about 17 mm. 



Gifu, Niphon ; April — May, 1S86 ; 2 sub-im., 11 ^ and 1 $ im. 

 Diptekomimus tipuliformis, McLach. 



Sub-imago (dried), ^. Wrings uniformly light grey, with piceous neuration. 

 Setse 3, pitch-brown, sub-equal to one another. 



Gifu, Niphon ; J, 1 im., 1 sub-im. 



SiPHLURUS BINOTATUS, Sp. OlOV. 

 Imago (dried), S- Wings vitreous, with pitch-black neuration j opposite or 

 adjoining the bulla of the sub-costa in the fore-wing, the few cross veinlets col- 



