118 EEV. A. E. EATON ON EECENT EPHEMEEID^ OE MAYFLIES. 



duller. Setce either piceous, or with their bases piceous and their remainder whitish 

 warm sepia, with the joinings alternately broadly and narrowly piceous. Forceps piceous 

 at the base, with their last two joints smoky grey. Eore legs {during life) pitch-l^lack, 

 with brownish-black tarsi, these changing in some lights to smoky grey ; hinder legs 

 2iiceous, with the tips of the femora dark, the tarsi blackish grey, and the tibiae in some 

 lights smoky grey, excepting towards both of their extremities. When dried, the fore 

 legs become dark piceous in opaque view, changing in oblique view to intense pitch- 

 brown, with the tarsus lighter brownish or almost light burnt-umber brown ; and viewed 

 with light transmitted the femur is dark piceous amber, the tibia less opaque, and the 

 tarsus testaceous amber. The hinder legs, lohen dried, are raw-umber brown, with the 

 tips of the femora dark, changing in transmitted light to translucent yellowish amber, 

 with the tips opaque. Wings vitreous, with pitch-brown neuration ; cross veinlets 

 generally well defined, excepting in the marginal area of the fore wing before the 

 pterostigmatic region, in the submarginal area before the bulla, and in the adjacent 

 portion of the followdng area ; but some of the lowland specimens have those in the 

 remaining portions of the fore wing scarcely stronger than the weaker cross veinlets of 

 the average Avius?. The mar2:inal area of the fore wing contains about 4-6 ill-defined or 

 obsolescent cross veinlets before the bulla, 3-4 beyond it, also obsolescent between that 

 and the pterostigmatic space, while this contains 7-12 well-defined simple straight or 

 slightly curved cross veinlets. 



$ {dried). — Thorax pitch-brown above. Wings transparent, with a slight brownish- 

 grey tint, and with the neuration more strongly defined than in the 6 . In one of the 

 specimens all of the cross veinlets of the fore wing are very distinct ; in other specimens 

 tliose corresponding in position with such as are obsolescent in the 6 are weaker than 

 Ihe remainder: the marginal area contains about 5-6 before the bulla, and 14-17 beyond 

 it, which are nearly all simple. Length of body 7-8 ; Aving 7-9 ; setae, d ini. 8 & 8"5- 

 9-5 & 10-5, 2 8 & 9-5 millim. 



Hub. Common in Algarve and Portugal, in May and June ; ranging from altitudes of 

 200-400 ft. near Silves, up to 2000-2850 ft. on Eoia in the former, and in the latter 

 from 380-1280 ft. at Cintra and 640 ft. at Ponte de Morcellos, up to 1800 ft. in the 

 Estrella, and 1600-2500 ft. near Villa Real in Traz-os-Moutes. 



Habrophlebia modesta, Hagen. Plate XIII. 22 b (penis, two views). 



Potamanthus modestus, ! Hag., Anu. Soc. Eut. Fr. scr. 4, iv. 31) (1864). 



Leptophlubia modesta, ! Etn., Traus. Ent. Soc. Loiulou (1871), 91, pi. v. 3-3 i [details]. 



Subimago {dried). — Eore wings sepia-grey, lighter than those of S. nervulosa, with 

 opaque neuration ; hind wings dull pale yellowish grey. Setse light warm sepia-brown, 

 with opaque joinings. 



Imago {dried), <S . — Very similar to U. nervulosa, but larger; not so distinctly pale at 

 the joinings of the al)dominal segments, but on the contrary uniformly dark above, in 

 the majority of specimens. Legs nearly of the same colours as those of H. nervulosa, 

 but in most lights the fore tarsus appears concolorous with the remainder of the leg : 



