EEV. A. E. EATON ON RECENT EPIIEMERID.E OR MAYFLIES. 279 



son. Miseell. Coll. (1861) Synop. Neuropt. N. Am. 4G; Walsb, Proc. Ent. See. Pliilad. ii. 204 (1863) ; 

 Etn., Trans. Ent. Soc. Loudon (1871), 121.— B. flaveula, Vict., Hist. Nat. Nevropt. ii. Epliem. 186, 

 pi. xxiii. 4 (18J3-0) ; ! Walk., List of Neuropt. Iiis. iu Brit. Mus. part iii. 559 (1853) ; Hag., Smithsou. 

 MisceU. Coll. (1861) Synop. Neuropt. N. Am. 44. 



Heptageniajldveola, ! Etu., Trans. Eut. Soc. Loudon (1871) 119, pi. vi. 2.2, 22 « [detail]. 



Subimago {dried). — Wings very light grey ; the longitudinal neuratiou of the fore 

 wing is, in some lights, concolorous with the membrane, in others pitch-brown ; the cross 

 veinlets in the ? , at first dark grey, afterwards become pitch-black ; those before the 

 bulla in the marginal and submarginal areas also become bordered with deep warm sepia- 

 brown ; the neuration of the hind Aving is concolorous with the membrane. Eemora 

 banded in the middle, and again distally more narrowly with dark grey. The whole of 

 the body and legs in the female are chiefly very light yellow-ochreous approaching Naples 

 yellow ; the abdominal segments 1-9 bordered distally in the midst of the back with 

 black grey, and in segments 1-6 marked with a small black s2)ot on each side of the 

 back just before the distal liorder, in place perhaps of the usual oblique stripes. 



Imago [dried). — 6 . Thorax rufo-lutcous above. Abdomen in segments 2-7 trans- 

 lucent ochraceous, white with the joinings above bistre-brown; segments 8-10 ruf'o- 

 luteous above ; venter spotless. Setae whitish-grey, with the joinings scarcely at all 

 darker. Legs sub-stramineous, ■\\'ith dark joinings ; everj" femur with a bistre-brown baud 

 in the middle and another distally ; the fore tarsus whitish, with dark joinings. Wings 

 vitreous ; the fore wing with the neuration mostly black, the costa, subcosta, and radius 

 however, being light translucent testaceous ; neuration of the hind wings pellucid. 



2 . Head and thorax very light ochraceous ; a greyish ii\)oi at the lower end of the 

 facial carina, a dark oblique streak at the base of the fore coxa, a black dash in the 

 suture in front of the hind coxa, and another on the hinder surface of the pleura above 

 the coxa. Abdomen (discoloured) of a redder yellow; the segments above narrowly 

 edged with black-grey at the joinings. Sette whitish-grey, Avith pitch-brown joinings. 

 Legs extremely light yellow-ochreous ; the median and distal l)auds of the femora dark 

 sepia-brown ; the extreme edge of the tibia at its distal termination above, and the 

 terminal joint of the tarsus, and also the ungues, light brown. Wings vitreous ; the 

 fore wing tinged very faintly with light dull greenish yellow in the submarginal area as 

 far as the vicinage of the pterostigma from the base of the wing; longitudinal neuration 

 translucent and of a light colour ; cross veinlets light bistre-brown, the great cross vein 

 coloured more strongly near the subcosta. The marginal area of tlie fore wing contains 

 about 4 cross veinlets before, and 11 beyond the bulla; these last are simple. Length 

 of body, c? 9, 2 8-10; wing, 6 10, 2 11-13; setoc, 6 im. 20, ? subim. 10 mm. 



Rab. St. Martin's Falls, Albany River, Hudson's Bay (Barnston, in Brit. Mus.) ; 

 West Farms, N.Y. (Angus, in M'Lach. Mus.) ; Tennessee (Poepig), Dalton, Ga. (Osten- 

 Sacken) and Washington {id., iu Hag. Mus.). 



EcDYURTJS LUBiDiPENNis, Burmcister. 



Ephemera noveboracana, Lichteusteiu, Cat. INIus. Holtliusien, iii. 193 (1796) ? 



XBaetis luridipennis, Burm., Handb. d. Eut. Bd. ii. Abth. ii. 801 (1839) ; Pict., Hist. Nat. Nevropt. 



