REV. A. E. EATON ON RECENT EPHEMEEID.^ OR MAYFLIES. 221 



extending to the middle ; the last segment has the sides of the dorsum whitish throughout. 

 Venter transparent whitish ; forceps-limhs sometimes whitish only in their longest joint. 

 Setre whitish, with the joinings alternately hroadly and narrowly fuscous. Wings 

 vitreous ; in the fore wing, the stronger of the longitudinal nervures, one discal sector 

 with its cross veinlets, the subcostal cross veinlets, and a small more or less obvious spot 

 at the bifurcation of the said sector, brown ; a coarse medial black line about a millimetre 

 long immediately beliind the radius, and sometimes a slight brown cloud in the ptero- 

 stigmatic region ; in the hind wing one long and one short series of cross veinlets on the 

 basal costa are strongly fuscous and enclose a brown cloud. 



S . Differs from d in having segments 2-6 of the abdomen pitch-brown above, each 

 paler towards the base ; and there is no brown cloud at the base of the hind wing. 

 Length of body 12-14 ; expanse of wing, c? 25-28, ? 28-29 ; length of setge, 6 im. 

 20-24, 2 im. 13-16, subim. 10-14 mm. 



mib. Rock Island, 111. (Walsh) ; Cincinnati, Ohio (Say). [After Walsh.] 



SiPHLURUS BicoLOE, Walker. 



Palingenia bicolor, ! Walk., List of Neuropt. lus. iu Brit. Mus. part iii. 552 (1853) ; Hag., Smithson. 

 Miscell. Coll. (1861), Synop. Neuropt. N. Am. 43. 



Siphlurus bicolor, ! Etn., Trans. Ent. Soc. London (1871), 128. 



Subimciffo {dried), 2 . — Wings light sepia-grey, the fore wing lighter and more trans- 

 parent at the base and within the space bounded by the anal (8) nervure ; neuration 

 dark ; cross veinlets of the pterostigmatic portion of the marginal area of the fore wing 

 about 20 in number, sparingly forked and anastomosing ; those of the disk margined with 

 darker grey. Vertex of the head, and also the notum, brown-ochreous. Abdomen dis- 

 coloured ; seta? light yellowish brown. Tore femur dark reddish pitch-brown, the tibia 

 rather less reddish and more piceous, the tarsus very light yellowish white. Hinder 

 femora, in opaque view, extremely light yeUow-ochre, changing in transmitted Hght to 

 pale amber ; the tibioe and tarsi more nearly white ; the ungues pitch-brown. Length 

 of body 11, wing 13 mm. 



Eab. St. Martin's Tails, Albany River, Hudson's Bay (Barnston, in Brit. Mus.). 



SiPHLTJRUS MIRUS, Sp. nov. 



Imago (dried), 2 . — Thorax dark pitch-brown above, varied at and near the peak of 

 the mesonotum with dull light Mars-yellow. Abdomen fulvous or dull Mars-yellow 

 above, varied with brownish, the hinder borders of the intermediate segments black, 

 the bordermg produced forwards along the lateral margins of the dorsum from the 

 hinder amjles of the se<?ments so as to form acute triangular black spots in segments 

 2-8, and a black linear streak on each side in segment 9 ; the median basal dot and two 

 livergiug lines of the dorsal segments are visible in at least segments 9-8. Venter nearly 

 )f the same colours as the dorsum ; segments 2-8 broadly margined with black behind ; 

 .he black transverse bands, expanded just at their extremities, and narrowly conjoined 

 ilong the lateral border, are each shortly extended into a projecting point midway 

 >etween the side and the middle of the segment. Sette whitish, with reddish joinings. 



