EEV. A. E. EATON ON EECENT EPHEIMEEID.^ OE MAYFLIES. 65 



(during life it is light sepia-grej); the base of the subcosta and the anterior extremities of 

 the cross veinlets anastomosing with it from behind are dark brown ; the other cross 

 veinlets jDOsterior to the radius (3) are bordered with light raw-umber, but their l)ordering 

 hardly gives rise to spots ; in certain lights the colour described as raw-umber changes in 

 both wmgs to light pitch-brown. Fore legs in opaque view dull obscure brownish ochreous, 

 or sometimes rather redder, the tarsus darker and duller, the tip of the femur, both ends 

 of the tibia, and the tips of the tarsal joints dull blackish ; hinder legs testaceous, or dull 

 light yellowish, the tarsi tinged somewhat with warm-sepia. 



$ similar, but the wings more faintly marked, the pronotum light bistre-grey, the 

 abdomen of a very pale yellowish green-grey ground-colour, and the fore tarsus conco- 

 lorous with the tibia. Length of body 11-17 ; wing, s 10-15, $ 10-16 ; setee, S 15-23, 

 subim. 17, ? im. 11-14 mm. 



Hab. Extensively distributed on the continent ; southern Sweden, Moscow, Germany, 

 Switzerland, N. Italy ; France, Paris district (M'Lach.), Toulouse ; Algarve, Sao Marcos 

 da Serra (Etn.) ; and Algeria (M^Lach.). It inhabits lakes and gentle rivers. At Geneva 

 and Lucerne the subimago abounds at street-lamps in favourable situations ; and spiders 

 lie in wait for them on the neighbouring walls in considerable numbers. Some nymphs 

 of this species in Dr. Joly's collection were labelled E. vulgata, and therefore it is very 

 possible that B. glaucops was the subject of both his and M. Vayssiere's anatomical 

 studies, and not the one quoted. 



Ephemera compar. Hag. Plate LXIII. 12 e (forceps). 



Ephemera compar, ! Hag., Ann. Rep. U. S. Geol. & Geograph. Sui'vey of the Territ. 1873, part iii. 



Zool. 578 (1875). 



Imago {dried), 6 . — Brown-ochreous, marked with black and rufo-piceous. Head pitch- 

 black, anteunse somewhat ochraceous. Pronotiun striped on each side lengthwise with 

 pitch-black ; the stripes lanceolate, broadest behind ; mesonotum light rufo-piceous with 

 a light translucent broAvn-ochreous stripe down the middle ; tegulse of a light ground- 

 colour, the notum marked in front of them with an abbreviated wedge-shaped pitch-black 

 streak on each side. Dorsal abdominal markings : — in segments 3-8, on both sides of 

 the disk, a pair of longitudinal subparallel black linear stripes, gently curved outwards, 

 and every stripe at its proximal extremity slightly enlarged on the inner side ; between 

 these stripes, in segs. 6-8, is interposed a single i)air of divergent black streaks from the 

 base, longest in the hindermost ; in seg. 9 the corresponding markings are confluent 

 across the back ; in seg. 2 the stripes on each side coalesce with one another and so 

 form two quadrangular blotches; in seg. 1 the corresponding spots are small and 

 indistinct ; seg. 10 is pale (of the ground-colour) with a triangular greyish cloud on each 

 side behind in place of the stripes ; every segment has an abbreviated black streak from 

 the base at the side close to the spiracular line, and segs. 5-7 have another from the tip ; 

 the joinings of the segments in some lights are opaque. Ventral abdominal markings :— 

 in segs. 2-8 a longitudinal black line on each side of the middle, slightly curved in- 

 wards ; in seg. 9, a quadrangular black blotch in the midst of the disk, narrowed some- 

 what anteriorly ; in seg. 10 a large rounded black spot on each side at the base. Setaj 



SECOND SERIES, ZOOLOGY. — VOL. III. 9 



