280 EEV, A. E. EATON ON EECENT EPHEMEEID.E OR MAYFLIES. 



ii. Ephem. 192 (1843-5;; ! Walk., List of Neuropt. Ins. in Brit. Mus. part iii. 563 (1853); Hag., 

 Smithson. Misccll. Coll. (1861) Synop. Neuropt. N. Am. 49.— B. noveboracana. id., op. cit. 50 (1861) ? 

 Heptagenia luridipennis , ! Etn., Trans. Eut. Soc. London (1871) 149, jjI. vi. 21, 21 a [detail]. 



Suhimayo {dried). — Wings transpareut, very liylit bistre - 2;rey ; the longitudinal 

 nervures bistre-brown, the cross veinlets piteh-black. Seta3 light bistre-brown, with 

 dark joinings. 



Imago {dried). — <3 . Thorax above rufo-testaceous or (in other lights) fusco-lutescent; 

 abdomen in segments 2-7 translucent light burnt-umber brown, opaque at the joinings, 

 and formerly with dark oljlique lateral stripes ; the hinder segments rather dark bistre- 

 brown. Setaj bistre-grey, witli dark joinings. Fore femora and tibitt; subtestaceous, 

 with two dark bands on the femur and the end of the tibia fuscous ; fore tarsus light 

 bistre-grey. Hinder legs dull light yellow-oclire, the coxaj, trochanters, and femoral 

 bauds, light w-arm sepia-brown, the apical edges of the tarsal joints, and the ungues 

 brownish. Wings vitreous, sliglitly discoloured in the pterostigmatic portion of the 

 marginal and submarginal areas ; tlie neuration pitch-brown, excepting the thicker 

 longitudinal nervures near the base, wliicli are there bistre-brown. 



? . Very similar to the 6 . Thorax raw-umber brown above. Legs dull light- 

 yellowish green horn-colour ; a band in the middle and at the extremity of the femur, 

 the joinings and the terminal joints of the tarsus, ungues included, warm sepia-brown. 

 The portion of the submarginal area of the fore wing adjacent to the pterostigmatic 

 space is faintly tinted with pale greenish. Length of body 10-11 ; wing, 6 13, ? 15 ; 

 seta?, d 25 (?), ? 15 (?) mm. 



Hah. St. Martin's Falls, Albany River, Hudson's Bay (Brit. Mus.) ; the St. Lawrence, 

 Canada (De Selys-Longchamps). 



EcDYURUS viCARiTJS, Walker. 



X Ba'elis vicaria, ! Walk., List of Neuropt. Ins. in Brit. !Mus. part iii. 565 (1853) ; Hag., Smitlison. 

 Miscell. Coll. (1861) Synop. Neuropt. N. Am. 48. — B. lessellatu, .'Walk., List of Neuropt. Ins. in Brit. 

 Mus. part iii. 566 ? 



X Ephemera pudica, ! Hag., Smithson. Miscell. Col., Synop. Neuropt. N. Am. 39 (1861). 



Hepiaffenia vicaria, ! Etn., Trans. Ent. Soc. London (1871) 150, pi. vi. 23, 23 « [details]: — nee H. 

 Xpudica, ! Ilag., Ann. Rep. U. S. Geolog. & Geograpli. Survey of the Terr, for 1873, part iii. Zool. 581 

 (1865). 



Subimago ? {dried). — Wings warm sepia-grey ; longitudinal neuration yellowisli brown ; 

 ci'oss veinlets in some parts black-brown, in other parts light sepia-brown, edged narrowly 

 with liglit sepia-grey, the black-l)rown or intense sepia colouriiig spreading along the 

 longitudinal nervures at tlieir junctions with cross veinlets, and causing the nervures to 

 be banded. Setae bistre-grey, with darker joinings. 



Imago {dried), 6 . — Notum brown-ochreous, modified with law-umber brown ; an 

 intense black-lirowu stripe from tlie fore wing roots on each side of tlie mesothorax. 

 Dorsum of the abdomen in segments 2-9 liglit jjitch-brown, in segment 10 brown- 

 ochreous ; on the dorsum and venter, by the spiracles, are translucent flgure-of-6-shaped 

 marks, and at the base of evei'y intermediate dorsal segment is a pair of short pale lougi 

 tudinal lines. Seta; bistre-brown with dark joinings. Fore femur, in opaque view, light 

 bistre-brown, banded broadly in tlie middle and narrowly at the tip w'ith jntch-brown; 

 tibia rather a redder raw-umber than the femur, brown-black at the tip; tarsus light 



