278 REV. A. E. EATON ON EECENT EPHEMERID^ OR MAYFLIES. 



Ecdyurits, being broader at the base, less recurved and more pointed at the tips : and 

 the tongue as a whole bears some resemblance in outline to an Eagle Ray {Myliohatis 

 aquila). Resident in rivers and streams. 



Type. E. venostts (in Ephemera), Pab. 



Dlslrihution. Europe eastwards to Siberia, the Caucasus and the river Euphrates ; the 

 Himalaya ; Nortli America from Texas northwards. 



Etymology. tKlixD and ovpa, in allusion to the abortion of the median caudal seta. 



NORTH AMERICAN SPECIES. 



EcDYURUS CANADENSIS, Walker. 



XBa'etis canadensis, ! Walk., List of Neuropt. Ins. in Brit. Mas. part iii. 5G9 (1853) ; Hag., Smithson. 

 ifiscell. Coll. (18(51), Syuop. Neuropt. N. Am. 47. 



Heptagenia canadensis, ! Etn., Trans. Ent. Soc. London (1871), 138, pi. vi. 12, Via. 



Imago (dried), 6 . — Head and thorax above rufo-piceous or rufo-lutescent, with a large 

 Idackspot on each side of the face below the antennse adjacent to the orbits of the eyes: 

 the pleurae streaked with piceous above the interspaces in advance of the hinder coxae. 

 Abdomen in segments 2-9, translucent, subochraceous, or very light bistre-grey, the 

 10th segment rufesceut, tlie apical borders of the previous segments across the middle 

 of the back, and the lateral spots or oblique stripes prolonged forwards from tliem pitch- 

 black ; venter very light wliitish ochreous. Setae pale, with fuscous joinings. Fore 

 femur (as an opaque ol)ject) rufo-lutescent or (with transmitted light) translucent bistre- 

 brown, with a broad black band at the base, another in the middle, and with a rufo- 

 piceous knee ; fore tibia rufo-lutescent tipped with black ; fore tarsus light brown-ochre, 

 with black joinings. Hinder femora (as opaque objects) light olive grey, or (with 

 transmitted light) very light greenish-yellow amber-colour, l)anded with black-grey in 

 the middle and near their terminations : hinder tibiae and tarsi light brown-ochreous, 

 their joinings rather dark, and the distal tarsal joint Ijrown. Wings vitreous, with 

 pitch-brown or bistre-brown neuration, excepting the cross veinlets between the costa 

 and sector in the fore wing, which are pitch-black. Tlie fore wing at the roots and in 

 the portion of the submarginal area subtending the pterostigmatic space very light raw- 

 umber, this colour extending further along the margin to just beyond the extremity of 

 the wing ; the remainder of the same area of a very much fainter tint : in the area 

 between the radius and the sector, in the vicinage of the bulla, 2 or 3 cross veinlets 

 approximated to one another are intersected by a short intense sepia-brown dash 

 rounded at both its extremities, and 3 or 4 of those nearer the base of the wing are 

 marked each with a rounded spot of the same colotu*. Terminal margin of the hind 

 wing narrowly bordered with sepia-grey. Length of body, ? 7"5, wing 8 mm. 



Hub. Canada (Brit. Mus.). 



ECDYURUS VERTICIS, Say. 



J Baetis vertlcis, Say, Journ. Acad. Nat. Sc. Pliilad. viii. 42 (1839) ; Walk., List of Neuropt. Ins. in 

 Brit. Mus. part iii. 502 (1853); Le Conte, Complete Writings of T. Say, ii. 412 (1859) ; Hag., Smith- 



