EEV. A. E. EATON ON EECENT EPHEMERID.E OR MAYFLIES. Il7 



portion of the latter pitch-brown, the tarsus lighter, varying with change of posture to 

 brownish-hlack-grey : [iohe7i dried, in oblique view the tibia reflects a liglit madder-brown, 

 or (in specimens from Biron) a liglit Venetian-red, and the tarsus is light testaceous ; in 

 transmitted liglit the former becomes translucent rufo-piceous or amber-brown, and the 

 tarsus yellowish amber.] Hinder legs {dried) translucent amber-brown in transmitted 

 light, changing in opaque view to a nearly uniform light pitch-brown, and in oblique 

 view to a liglit translucent bronze or bistre-brown, the tarsi in certain positions appearing 

 light greyish, with opaque edges to the intermediate joints, but usually concolorous 

 with the tibife. Wings vitreous ; the longitudinal nervui'cs and the cross veinlets of the 

 pterostigmatic region of the fore wing in opaque view pitch-brown, in oblique view light 

 brownish ; in transmitted light the stronger nervures become yellowish amber, and the 

 finer whitish. The marginal area of the fore wing contains about 4 obsolescent cross 

 veinlets before the bulla, and beyond that 11 ; of these, 4-8 in the pterostigmatic region 

 are well defined, simple, and slightly curved; the remaining cross veinlets of the wing 

 are more delicate, and are deficient in colouring, excepting sometimes those in the distal 

 half of the submargiual area. 



$ similar generally to d" , with the fore tarsus lighter, and the setre with darker 

 joinings. In the fore wing the neuration, on the whole, in a slight but appreciable 

 degree is better defined than in the d , and the cross veinlets in the outer half of the 

 wing situated between the radius (3) and the proebrachial (6) nervures exhibit the same 

 colours as those in the pterostigmatic region. Length of body 5-7; wing G-7 ; setae, 

 d im. 8 & 12-11 & 12, ? 6 e% 8-8 & 9, subim. 5-5 & 7 millim. 



JIab. Generally common in Western Europe during the summer months, frequenting 

 brooks and rivcr^s of moderate temperature, and ranging from Great Britain and the 

 Vosges (jM'Lach.) southwards to the lowlands of Switzerland and southern Prance. 

 Specimens from this last district (where I have met with it in the neighbourhood of 

 Toulouse and abundantly at Biron near Orthez) have the wings of the subimago more 

 of a sepia-grey than a black-grey, and the legs of the d imago rather brighter in tint 

 than those of normal examples; the thorax also of a 2 im. from Toulouse, in my 

 collection, is pitch-brown instead of pitch-black ; but this 2 may have been prematurely 

 killed, and the difFerences in colouring of the 6 im. and the subim., mentioned, are not 

 sufficiently marked to be accounted specific. 



Habkophlebia nervulosa, sp. nov. 



Subimago (r/r/Vf/).— Wings sepia-grey, with pitch-brown neuration. Setae warm sepia- 

 grey, with opaque joinings. 



Imago {living and f/r/^f/).— Difficult to distinguish from R. fitsca without actual com- 

 parison of specimens; chiefly characterized by the cross veinlets of the wings being 

 usually more strongly defined than in that species, and by the hinder femora lieing dark 

 at the tip in opaque view. — s . Upper portion of eyes castaneo-piceous, the lower sub- 

 piceous. Thorax jet-black above, sometimes dark piceous when dried. Abdomen dark 

 piceous above, with the apical margins of the segments narrowly yellowish, and with the 

 bases of segments 4-7 in some examples partially translucent ; venter slightly paler and 



SECOND SEMES. — ZOOLOGY, VOL. III. 16 



