292 REV. A. E. EATOX OX EECEXT EPHEMERID.E OR MAYFLIES. 



retciining the darker tint, while the longitudinal nervures assume the lighter ; neuratioa 

 in $ lighter than in d , especially towards the wing-roots, varying with change of 

 posture from light pitch- or light bistre-brown to raw umber-brown, the cross-veinlets, 

 as in the other sex, retaining the darker tint in some stand-points ; in the 6 the great 

 cross vein of tlie fore wing is dark from the radius almost to its junction with the costa, 

 but in the $ it is piceous only from the radius to about half across the marginal 

 area, and is in its dark part more strongly contrasted in colour with the neigh- 

 bouring nervures than in the <s . In the ptcrostigmatic region of the fore wing of 

 both sexes the reticulation formed by the branching and anastomosis of the cross-veinlets 

 varies considerably in extent with the individual, but in comparison with that of some of 

 tlie other species of this genus is unusually open in texture. 6 {living). — Eyes black- 

 brown. Notum atro-fuscous. Dorsum of abdomen light bistre-brown, with the tips of 

 the segments darker ; venter dark olive-grey, usually spotless. Setae liglit greenish 

 grey, with darker joinings. Legs somewhat as in dried specimens ; the tarsi and fore 

 tibia fuscous ; the bands of the hinder femora light reddish or carneous. Wings vitreous, 

 with blackish neuration, and with a slight discoloration in the ptcrostigmatic region of 

 the fore wing. Length of body 12-15 ; wing, 6 13-14, ? 11 ; seta? 6 im. 25-28 mm. 



Hnh. England ; near Reading, on the Thames above Pangbourne, and on the Holy- 

 brook above Coley Park, towards the end of May. Holland, near Arnheim in Gelderland 

 (2 6 and 2 ? im., captured by Mr. j\Ieddenbach van Rooy, in Albarda Mus.) at the end 

 of May and beginning of June. Mr. Albarda has taken objection to the blunder 

 committed by me, at p. 274 supra, in referring this species (albeit with hesitation) 

 as a variation to Heptaxjcrdn flavipennis, and has lately forwarded to me for inspection 

 the four Dutch specimens mentioned above. My error arose from imperfect recollection 

 of the insect, which I had not seen since the time of its original descriiitiou. 



ECDTURTJS ZEBEATA, HagCn. 



X Bactis -ebrata, Hag., Ann. Soc. Ent. Fr. (1864) 38. 



Heptagetiia zebrata, Etn., Trans. Ent. Soc. London (1871) 155 [part.]; vide Hag. & Etn., o/). ct/. 

 (1873) 40(]. 



Suhlma go {dried). — Wings dark grey; longitudinal neuration yellowish ; cross-veinlets 

 edged with black. 



Imago, <3 . — Eyes blue or green during life. Notum livid, clouded with brown. 

 Abdomen yellow [jaune] with a broad median longitudinal l)lack dorsal stripe, and 

 oblique brown-black lateral stripes confluent with the bordering of the hind margins of 

 the segments. Seta; white, aunulated at the base, the middle, and the tip of each joint 

 with black. Legs pale yellow, with the knee and tarsus brown, and a broad black 

 median femoral band. Wings vitreous; the longitudinal nervures yellow; the cross- 

 veinlets brown; hence the fore wing has a spotted appearance, especially along the 

 anterior margin. 



2 . — Similar, but larger than the <3 . The anterior margin of the fore wing is rather 

 more spotted. Length of wing, c7 10, ? 12 ; seta?, d im. 20, subim. 12, $ im. 15 mm. 



Rah. Corsica (Hag.). [After Hagen.] 



