EEV. A. E. EATON ON RECENT EPHEMERIDyE OR MAYFLIES. 103 



neuration in opaque view for the most part colourless, but the subcosta and radius as 

 well as the distal portion of the costa light umber-brown, changing in transmitted light 

 to pale brownish amber. 



S . Head as in B. cupidiis. Thorax pitch-brown above ; pronotum pitch-black in the 

 middle, but towards the sides lighter than that of B. cupichis. Setaj subsimilar to those 

 of the same species, but of a warmer tint. Wings vitreous, not tinted in the ptero- 

 stigmatic space ; neuration not so dark as in B. mipidus. Fore legs in opaque view light 

 pitch-brown, with the trochanter and base of the tibia dull pale yellowish brown, and 

 the tarsus more opaque than the tibia ; the femur and tibia reflect a rufo-piceous tint, 

 the tarsus a dark reddish brown : in transmitted light their prevailing colour is dark 

 amber-brown. Hinder legs in opaque view either apparently of lighter shades of the 

 same colours as the fore legs, or more of a light bistre-brown ; their reflection is raw 

 umber-brown ; in transmitted light their colour is yellow-amber, and the tarsal joinings 

 arc narrowly opaque. Length of body 8-10 ; wing 8-12 ; sette, im. d 17 & 8-18 & 9, 

 $ 12 &, 9-5-17-3 & 13 mm. 



Hah. Montana (M'^Lach. Mus.). A species smaller and lighter in colour than B. 

 cupidns. 



Blasturtjs nebulosus, Walk. 



Palingenia nebulosa, ! Walk., List of Neuropt. Ins. in Brit. Mus. part iii. 554 (1853) . 



Potamanthus nebidosus, Hag., Smitlison. Miscell. Coll. (1861), Synop. Neuropt. N. Am. 52; Walsh, 

 Proc. Eut. Soc. Pbilad. ii. 193, note 13, 194, note 15 (18G3).— P. odonatus, Walsh, Proc. Acad. Nat. Sc. 

 Philad. (18G2), 372; Hag., Proc. Ent. Soc. Philad. ii. 171 (1863). 



Leptophlebia nebulosa, ! Etn., Trans. Ent. Soc. London (1871), 89, pi. v. 1-1 a [details]. 



Imago {dried) 6 . — Thorax jet-black above. Abdomen pitch-brown above, dull light 

 bm-nt-umber brown beneath. Forceps either uniformly light umber-brownish, or very 

 light dull yellowish ochre at the base, passing distally into light brownish. Seta? light 

 Vandyke-brown, with pitch-brown joinings. Fore legs rufo-piceous, the tarsi lighter ; 

 hinder legs either testaceous or dull translucent, almost raw-umber brown. Wings 

 vitreous, with rufo-piceous neuration ; the fore wing with a large round light raw-umber 

 cloud in its apical third ; its marginal area with 7 faint cross veinlets before the bulla 

 and about 22 beyond it, many of which in the pterostigmatic space fork near the costa 

 and anastomose with one another. Length of body 10, wing 10-11, setae 30 »& 6 mm. 



Hah. St. Martin's Falls, Albany river, Hudson's Bay (Brit. Mus.) ; Rock Island, 111. 

 {Walsh). 



(?) Blasttjetjs vespektinus, Lin. 



Ephemera vespertina or [Ephemera], Lin., [GElandska Ecsa, p. 21 (1745); Fu. Suec. ed. i. 755 (1746) ; 

 Syst. ed. x. i. 547 (1758) ; Fu. Suec. cd. ii. 378 (1761)J ; id., Syst. Nat, ed. xii, pars ii. 906 (1767); 

 [De G., Mem. pour scrvir h Phist. d. lus. ii. pars ii. 646, pi. xvii. 11-16 (1771) ;] Zet., Ins. Lap. 

 col. 1015 (1840); Westw., Introd. mod. classif. lus. ii. fig. 61, no. 19, after De Geer (1840). 



Subimago {dried).— EoAj and fore wings black ; hind wings white. One of the smaller 

 species of the family. 



Hah. Plentiful at the river Sathaella, in Smoland. [Abstract from Linne.] De Geer's 



14* 



