EEV. A. E. EATON OX EECENT EPHEMERLD^ OR MAYELIES. 169 



Baetis posticatus, Say. 



J Cloeon post'icuta, Say, Godman's West. Quart. Rep. ii. 162 (1824) ; Le Conte, Complete Writings of 

 T. Say, i. 172 (1859). 



Clo'e posticata, Hag., Smithson. Miscell. Coll. (1861), Syuop. Neuropt. N. Am. 53. 

 Baetis posticatus, Etn., Trans. Ent. Soc. Loudon (1871) 120. 



Imago, d .— Ej'es reddish brown ; thorax black ; abdomen greenish white, hyaline, the 

 last three segments fuscous ; seta? w^hite. Legs white, the fore femur obscure. Wings 

 hyaline. Length of body 8, setaj 19 mm. (After Say.) 



Rab. Shippiugsj)ort, 21st May. Common. (Say.) 



Baetis Hageni (renamed). 



Clo'e \\ unicolor, Hag., Smithson. Miscell. Coll. (1861) Synop. Neuropt. N. Am. 54; Walsh, Proc. 

 Acad. Nat. Sc. Philad. (1862) 380?; Hag., Proc. Ent. Soc. Philad. ii. 178 (1863) [nee CI. unicolor, 

 Curt. (1834)]. 



Baetis unicolor, Etn., Trans. Eiit. Soc. London (1871) 120. 



Imago {dried), ? . — Body bronze-lirown ; legs pale luteous ; setre white; wings hyaline. 

 Length of body 4 ; exp. of wings 10; setse 10 mm. (After Hagen.) 



Hab. Washington (Osten-Sacken). The translator of Dr. Hagen's Synopsis wrote 

 "brassy" for " bronze." Walsh may have confounded another species with Ilagen's. 



BAiiTIS RUBESCENS, Hag. 



CloeXW unicolor, Provanclier, Natural. Canad. viii. 267 (1876); id.,Yn. Ent. Canad. ii. fasc. i. 84 

 (1877).— C. nibcscens. Hag. MS., id., op. cit. ii. fasc. i. 82' (1877). 



Imago ( ? ? dried). — Body reddish brown, the abdominal segments margined with 

 black behind ; setae whitish ; legs pale yellowish ; wings hyaline, reddish at the base and 

 along the costal margin. Long. -22 pouce = ll-8 mm. (After Provancher.) 



Sab. Not stated ; probably Quebec. As this insect was taken by I'Abbe L. Pro- 

 vancher to be CI. II unicolor. Hag., which is a Baetis, I infer that it also has 4 wings, and 

 is referable to the same genus. But judging from the coloration of tlie mesothoracic 

 wings, it might be a Cloeon, or even a CalUbcetis, if this genus ranges so far as 

 Quebec. 



Baetis propinqtjus, Walsh. 



CloeXi:icina, Walsli, Proc. Acad. Nat. Sc. Philad. (1862) 380; id., Proc. Ent. Soc. Philad. ii. 207, 

 note 20 (1863).— C. propinqua, AValsh, loc. cit. (1863). 



Baetis propinqutis, Etn., Trans. Ent. Soc. London (1871) 121. 



Subimago.— Wings fumose, with rather coarse and dusky longitudinal neuration ; the 

 cross veinlets concolorons with the membrane. Tarsi sometimes dusky. 



Imago, d . — Lower portion of the oculi attached to the hinder " corner " of the 

 turbinate portion. Thorax and last 4 dorsal segments of the abdomen piceous ; the 

 intermediate abdominal segments wdiitish hyaline, each with a dot at the sides ; venter 

 pale hyaline, the last 4 joints opaque whitish. Setae whitish, the joinings near the base 

 often fuscous. Legs pale, except the fore femur, which is sometimes pale ferruginous ; 



SECOND SEMES. — ZOOLOGY, VOL. III. 23 



