294 EEV. A. E. EATON ON EECENT EPHEMERID^ OR MAYFLIES. 



hence the yellowish streak in front of the fore wing-roots is not conspicuous. Setae 

 whitish. Fore leg, in opaque view, piceous, excepting the tarsus and the basal half of the 

 femur, which are lighter in colour. Wing-neuration in opaque view wliitish, excepting, 

 in the fore wing, the great cross vein and the roots of the subcosta and radius, which are 

 slightly brownish in certain postures. {Liviug.) — Eyes intense burnt uuiber-brown 

 alcove, black beneath, traversed by a chrome- or lemon-yellow line. Pronotum yellow- 

 ochreous, with a piceous streak on each side ; mesonotum bistre-brown ; tegulse yellowish 

 ochre; metanotum either j)itch- or jet-black ; pleura rufo-piceous, with black streaks 

 descending in front of the liases of the coxae ; sternum rufo-piceous. Abdomen either 

 rufo-badious [a colour approaching Mars orange] or reddish umber-brown : the dorsal 

 joinings and a short acute triangular streak from the base of each segment except the last 

 two, coincident with the tract of the dorsal vessel, darker than the ground-colour ; in 

 segments 2-6 above the pleura on each side of the back is a large triangular or quadri- 

 lateral ochraceous spot tapering anteriorly, Avliich contrasts to advantage with the 

 contiguous portions of the dark joining ; in segments 7 and 8 the corresponding pale 

 spaces are much smaller and less distinct. Venter in some specimens pale lurid, with a 

 continuous median series of obcordate blotches approaching Mars orange in colour. 

 Setffi white, with the first three or four joinings rufescent. Pore femur eitlier piceous 

 or rufo-piceous in its distal half, and paler or lurid towards the base, with traces of a 

 dark median band ; tibia and all but tlie last joint (which is either rufo-piceous or darker 

 than the other joints) of the tarsus either blackish grey or cerviuous. Hinder legs 

 lurid testaceous, with the median band and the tip of the femur, the base of the tibia, 

 and the joinings and terminal joint of the tarsus rufescent piceous, and the spiuule of 

 the trochanter piceous or black ; sometimes the tarsus is altogether reddish. Wings 

 vitreous, neuration colourless. Length of body, 6 12-13'5, wing 10-11, setae 6 im. 

 15-16 mm. 



Sah. The Netherlands. This species was first communicated to me by Mr. Albarda, 

 who thought it might be identical with one of Hagen's Corsican species. I afterwards 

 met with it near Arnheim ; it is common in the neighbourhood of the raihvay -bridge at 

 the end of July, and doubtless earlier before the seasonal rise of the llhiue. 



ECDYUEUS LATERALIS, Curtis. 



X Baetis laleralis, Curt., Loiul. & Edinb. Pbilos. Mag. ser. 3 (1834) 121 ; ! Stepli., 111. Brit. Ent. vi. 65 

 (1833); Pict., Hist. Nat. Nevropt. ii. Ephem. 175, pi. xxi. 3-G (1843-5) ; Walk., List of Neuropt. Ins. 

 in Brit. Mus. part iii. 557 (1853) ; Hag, Ent. Ann. (18G3) 28.— jB. J ohscura, Pict., Hist. Nat. Nevropt. 

 ii. Ephem. 182, pi. xxiii. 1 (1843-5) ; Walk., List &c., part iii. 557 (1853) ; Hag., Ent. Ann. (18G3) 28 

 [nee IStcph. 1835]. 



J Clo'e brunnea, Ramb., Hist. Nat. tl. Ins. Nevropt. 298 (1842) ; Walk., List of Neuropt. Ins. in Brit. 

 Mus. part iii. 557 [as var. ? of C. % halteratci] (1853) ; Rosenbaucr, Tbier. Andalus. 3G6 (185G) ; Ed. 

 Piet., Synop. Nevropt. d'Espag. 26 (1865). 



Heptayciiki lateralis, ! Etn., Trans. Ent. Soc. London (1871) 155, pi. vi. 27 [detail) ; Meyer-Diir, Bull. 

 Soe. Ent. Suisse, iv. 313 (1874). — H. ohscura, id., loc. cit. (1874) ; Rostock, Jabresb. d. Ver. f. Naturk. 

 Zwickau, 1877, p. 91 (1878). 



SuUmago {dried). — Wings uniformly tinted either with brownish [vandyke] grey, or 



