EEV. A. E. EATON ON EECENT EPHEMERID^ OE MAYFLIES. G7 



well as to the proximal ends of the nervures from the terminal margin that join it as 

 branches, the bordering confluent irregularly in transverse bands (in lieu of the customary 

 spots) in addition to the median band ; in the hind wing, a broad cloud tapering behind 

 runs backwards along the terminal margin from the distal portion of the costal margin, 

 the edging of the cross veinlets in the submarginal area is confluent near the subcosta 

 towards the base of the wing, but tapers rapidly towards the radius (3) beyond the limits 

 of the confluence, a narrow irregular blotch extends from about the proximal extremity 

 of the cubitus (4) to about the second series of the cross veinlets included within its 

 fork (doubtless an instable character), and the edging of the cross veinlets in the 

 remaining parts of the disk constitutes numerous small sjjots. Neuration piceous, but 

 lighter in a large portion of the hind wings and in part of the axillary region of the fore 

 wings. 



? very similar to the d , the thorax rather lighter ; the 9th abdominal segment as 

 well as the foregoing segments Naples-yellow, the 10th light brownish. Setae light raw- 

 umber grey with black joinings. Tore femur intense Vandyke-brown or piceous, blackish 

 lengthwise through the middle ; tibia and tarsus light olive-brown, the extremities of the 

 former, and the first joint together with the distal extremities of the intermediate joints 

 of the latter, blackish brown, the terminal joints and ungues reddish brown ; hinder legs 

 nearly as in the d . Wings more transparent than in the d , the clouds along the ter- 

 minal margins obsolescent and greatly restricted ; the usual median fascia of the fore 

 wing is broad and very distinct, but the edging of the cross veinlets elsewhere does not 

 coalesce into blotches, excepting to a very limited extent in the places of the usual spots ; 

 the branches of the anal nervure (8) arc marked each with a round spot close to their 

 anterior extremities. In the hind wing the spot at the end of the cubitus (4) is separate 

 from that at the fork ; but otherwise the wing is very like the d hind wing. Length of 

 body, cj 13, ? 18-5 ; wing, d 13'5, ? 19 ; setae, d about 30 mm. 



Mab. New York (Osten Sacken), 9th June ; Quebec (Provancher), in Mus. Comp. Zool. 

 Cambridge, Mass. 



Ephemera simtjlans, Walk. Plate LXIII. 12 (/ (forceps). 



Ephemera shnulans, ! Walk., List of Neuropt. lus. in Brit. Mus. part iii. 536 (1853); Hag., Smithson. 

 Miscell. Coll. (1861), Synop. Neuropt. N. Am. 38.— £. decora, ! Walk., List supra cit. part iii. 537 (1853) ; 

 Walsh, Proc. Acad. Nat. Sc. Philad. (1862), 376; id., Proe. Eut. Soc. Philad. ii. 177 {\^Q,^).—E.natata, 

 ! Hag., Smithson. Miscell. Coll. supra cit. 39 [after Walker] ; id., Proc. Ent. Soc. Philad. ii. 177 (1863) ; id.. 

 Trans. Ent. Soc. London (1873) , 393 ; ! id., Ann. Rep. U.S. Geol. and Geograph. Survey of the Terr. 1873, 

 part iii. Zool. 580 (1875) .—E. % ijuttulatu, ! Etu., Trans. Ent. Soc. London (1871), 69, pi. iv. %-(^h [details] . 



X Palingenia natuta, ! Walk., List sujjra cit. part iii. 551 (1853). 



Snhimago {dried).— Wm^s translucent, dull light sepia-grey, the wing-roots and lon- 

 gitudinal nervures in opaque light bistre-brown, the disk and black cross veinlets marked 

 as in the imago. Setae pitch- or intense raw-vimber brown, with opaque joinings. Tibiae 

 lighter than the femora and tarsi ; fore femur pitch-brown, hinder femora dark bistre- 

 brown : tarsi sometimes blackish, sometimes Vandyke-brown. 



Imago {dried), d .—Thorax above deep rufo-piceous, the pronotum in some positions 



9* 



