272 EEV. A. E. EATON ON EECENT EPHEMERID.E OR MAYFLIES. 



and eight (probably from Poseu), captured during the second fortnight in June, from Prof. 

 Zeller. The red-purple tint in the pterostigmatic region of the fore wing, the black-purple 

 dorsal stripe, and the faint traces of the almost obliterated purple-brown femoral bands 

 serve to mark off this species from its very similar neiglibours. 



Heptagenia gallica, sp. nov. Plate XXIII. 45 (fore wing), XXIV. 45 a ( $ tarsi 1 & 2, 

 penis dried). Nijmph, Plate LX. 



Heptayenia [nymph], ! Etn., Ent. Mo. Mag. xviii. 25 (1881). — H. gallku, ! id., in the writing of the 

 plates cited above (1883). 



Imago {dried). — Femora, each more or less faintly marked with a dark median band, 

 which bands in some [possibly newly moulted] specimens are incomplete, the colouring 

 matter extending only part way across from the under edge of the femur. On each side 

 of the metanotum above the insertion of the hind coxa is a dark spot, which is relatively 

 large and rounded in 6 , but quadrangular and smaller in $ . Tract of the dorsal vessel 

 narrowly bordered with brownish ; the terminal edges of the intermediate dorsal 

 segments are entirely dark. — d {living). Eyes at first black, changing to csesious with 

 a black transverse line. Thorax raw-sienna above, Avith the peak of tlie mesonotum 

 and a large round spot just behind and below the hind wing-roots black. Dorsum of 

 abdomen in the middle of the intermediate segments, and right across their terminal 

 borders, fuscous ; segment 10 raw-sienna ; the sides of the dorsum in segments 2-7 trans- 

 lucent whitish, with the main trunk of tlie tracheae in a large measure black. Setae 

 whitish, distally with every joining, but near the base with only the alternate joinings 

 piceous. Hinder legs whitish amber or cretaceous, with greyish tarsi and black tarsal 

 joinings : the spine of the trochanter and tlie median spot at the lower border of the femur 

 blackish, the tip of the femur fuscescent. The fore femur, tinged with raw-sienna, is 

 similarly marked w ith blackish, and the tip of the fore tibia and the terminal joint of the 

 tarsus are also black ; but the other joints of the fore tarsus are concolorous with the tibia 

 with black joinings, excepting the first joint, which is greyish. In front of the basal 

 joining of the hind coxa is a dark dash ; the mesosternal ganglion shows as a cordate 

 fuscous blotch. Wings vitreous, with piceous neuration ; the great cross vein, towards 

 the costa, and the proximal extremities of the longitudinal ncrvurcs of the fore wing are 

 deficient in colour ; in some positions the costa, subcosta, and radius of this wing become 

 bistre-brown, and in trcms?nitted light the neuration, as a whole, appears brownish amber- 

 colour. The pterostigmatic region is sometimes very faintly tinged with brownish. — 

 When dried the notum is brown ochreous, varied behind with pitch-brown ; the fore tibia 

 and tarsus become very light brown-ochreous with blackish markings. Hinder legs very 

 pale yellowish amber, with greyish markings ; the bands at the tips of the femora become 

 obsolete. 



? {dried). — Before oviposition the insect closely resembles JT./«t'a in its colouring; 

 but afterwards it is as follows : — Thorax above pale yellowish ochre, approaching Naples 

 yellow, varied behind, and also below the tegulse in front, with a whiter ochre. Abdomen 

 in segments 2-7 translucent dull whitish ochre, with the terminal margins of the segments 

 narrowly dark grey across the back, and with a brownish streak from in front, tapering 



