EEV. A. E. EATON OX EECEXT EPHEMEEID.E OE MAYFLIES. 301 



the hinder tarsi. Occasionally paler than S , and sometimes with the venter sangui- 

 neons. The hyaline portion of the wing-nervures is more extensive than in 6 , especially 

 in the hind wings. Length of body 7-9; setai, d im. 25-27, snbim. 12-14, $ im. 

 17-20 mm. 



Sab. Rock Island, 111. [After Walsh.] 



HEPTAGEiSriA MACULIPEXNIS, Walsh. 



Heptagenia macuUpennis, Walsh, Px-oc. Ent. Soc. Pliilad. ii. 20G (1863) ; ! Etn., Traus. Ent. Soc. Lon- 

 don (1871) 139. 



Subimago. — Wings tinged with dusky ; cross-veinlets slightly bordered with dusky. 

 Setoe tinged with dusky towards the tips. 



Imago, <s . — Fore tarsus longer than the tibia, \^ ith the tirst joint about f as long 

 as the second ; in the hinder tarsi the first joint is as long as the second. The 

 peculiarity of the cross-veinlets of the fore wing, described below, is noteworthy. 

 Notum ferrugineous. Dorsum of abdomen pale yellowisli to the basal ^ of segment 

 7, and then piceous up to the extreme base of segment 10 ; the remainder pale 

 yellowish. Seta3 and forceps whitish. Femora yellowish, usually with a short fine 

 fuscous vitta beneath at the tip ; tibiae and tarsi whitish, the tip of the fore tibia and the 

 ungues fuscous. Wings hyaline: in the fore wing most of the longitudinal nervures 

 are fine and dusky, and most of the cross-veinlets black ; but the neuration of the axillar 

 region, like that of the whole of the hind wing, is colourless : in the fore wing the black 

 cross-veinlets are comparatively coarse, and some of them are bordered with coal-black, 

 several of those in the margiiial and submarginal areas being immersed in small rounded 

 blots of that colour. The cross-veinlets of the marginal area are unevenly spaced ; 3 

 stand close together in a group at the bulla apart from the others in that area ; and again, 

 in the pterostigniatic portion of the same, midway betAveen the bulla and the ajjes, is 

 another similar group of 4 or 5 cross-veinlets, bordei*ed with black like those of the 

 former group : in all, the area contains, from the great cross-vein up to the bulla, 4-6 

 heavily bordered cross-veinlets, and beyond tlie bulla about 13, of which last only the 4 

 or 5 above mentioned are bordered. In the next two areas, 2-3 cross-veinlets are like- 

 wise grouped together in rear of the bulla apart from the others of those areas. 



? . — Paler than the male ; dorsal segments 8-10 opaque whitish, tinged more or less 

 with ferrugineous. The bordering of the cross-veinlets is rather lighter than in <s 

 Pore tarsus longer than the tibia ; joint 1 about f as long as joint 2. Length of body 

 4'5-6 ; setfP, 6 im. 12-15, subim, 7'5, $ im. 9-12, subim. 8 mm. 



Rab. Eock Island, 111. (Walsh) ; United States (M^Lach. ]\Ius.). [Chiefly after Walsh.] 



ECDTURUS GUTTATUS, Pictct. 



X BciLtis yuttata, Pict., Hist. Nat. Nevropt. ii. Epliem. 187, pi. xxiv. 3 (1843-15) ; Walk., List of 

 Neuropt. in Erit. Mus. part iii. 559 (1853). 



Ephemera [Baetls) guttata, Blancliard, Gay, Hist, lisic. v politic, de Chile, vi. 106, Atl. Nevropt. ii. 2 

 (1851). 



Heptagenia guttata, Etn., Traus. Ent. Soc. London (1871) 156. 



Imago [dried), $ . — Head and thorax fuscous, varied with small spots of yellow and 



