EEV. A. E. EATON ON EECENT EPHEMERID.i; OR MAYFLIES. 71 



fork of the prfebrachial (6) nervure ; a spot more distant from tlie wing-roots, beyond the 

 termination of the stripe, ontside that fork ; and a spot nearer the wing-roots, placed at 

 the proximal extremities of the accessory nervures interjacent between the pobrachial(7) 

 and anal (8) nervnres. 



S {dried). — Meso- and metanotum light brown-ochreous ; pronotum lighter, marked 

 on each side with a broad longitudinal pitch-black stripe, which is preceded by a quadran- 

 gular spot on the cervical membrane, and is narrowly incurreut along the hinder edge of 

 the segment ; below the peak of the metanotum the prominent border is dark. Abdominal 

 markings seemingly similar to those of the <s , bu.t largely effaced by Psocidse in the 

 specimens examined. Seta? greenish grey, with pitch-black joinings. Fore coxa and 

 trochanter light yellow-ochreous ; femur and tibia very light l)istre- or raw-umber grey, 

 blackened distally ; tarsus nearly coucolorous with the tibia, but duller ; a small triangular 

 spot at the outer extremity of the coxa, both ends of the tibia, the first tarsal joint and 

 the extreme base of the second, pitch-black ; the apical borders of the other intermediate 

 joints, the terminal joint and the ungues, light burnt-umber brown. Hinder legs 

 coloured as in the d . Wings transparent, colourless generally, but in the submarginal 

 area of the fore wing tinged very faintly with greenish yellow ; the spots, less blended 

 than in the 6 , are greyish black, and the lighter edging of tlie cross veinlets is more 

 restricted; wing-roots and near ends of longitudinal nervvu-es light yellowish ; the costa, 

 subcosta, and radius external to the great cross vein of the fore Aving light brownish- or 

 greenish grey, changing in transmitted light to amber-brown ; cross veinlets, and the 

 great cross vein from the subcosta to the radius of the fore wing, black ; neuration of 

 hind wings uniformly light yellowish, membrane colourless. Length of body, d 11, 

 ? 15 ; wing, 6 12, 2 li ; sette, d 25-27 mm. 



Hob. New England; Norway, Maine; New Haven, Conn. (Mvis. Comp. ZooL, Cam- 

 bridge, Mass.). 



Ephemera flaveola, Walsh. 



Epheme7-a flaveola,Walsh, Proc. Acad. Nat. Sc. Pbilad. (18G2), 377; Hag., Proc. Eut. Soc. Philad, ii. 

 178 (1863) ; Etn., Trans. Ent. Soc. London (1871), 70. 



Snhlmago. — Wings subopaque, the membrane slightly dusky, and, in a single 6 , with 

 slightly dusky neuration. Seta3 dull pale greenish. 



Imayo, d . — Head ferruginous above, the orbits of the ocelli and basal joints of the 

 antennte a little dusky. Thorax pale ferruginous. Abdomen yellowish, joints 3-7 

 with a lateral pale fuscous vitta interrupted at the sutures ; setae whitish with fuscous 

 joinings. Legs yellowish ; the terminal half of the fore femur ferruginous, the fore 

 tibia and first tarsal joint, the other joints at the joinings and the last joint at the tip, 

 fuscous ; the tips of the hinder tarsi fuscous. Wings hyaline, the fore wing slightly 

 yellowish along the costa, the neuration colourless, excepting the costa, subcosta, radius, 

 and great cross vein, which are yellowish. 



$ similar to the d , but having the abdomen egg-yellow in the parts full of eggs, 

 and having fuscous cross veinlets in the wings, excepting in the tips and along the 

 terminal borders. Length of body, <^ 7-5-9-5, 2 9-10-5; exp. of wing, d 17-19, ? 19- 



