Ephemeridae from South Africa. 187 



dark reddish brown above with black stigmata and with yellowish 

 hind borders ; 7th-9th segments reddish yellow with a reddish 

 brown median stripe. Ventral surface yellowish with a reddish 

 brown median stripe; the 9th segment with a long prolongation, 

 having an incision at its apex. Setae reddish at the base and 

 becoming yellowish towards the apex ; all the joints with a darker 

 annulation. Legs and wings as in the male. 



Length of body : $ , 1 mm. ; 5 , 11 mm. ; forewing : <? , 8'5 mm. ; 

 ? , 14-15 mm. ; setae : 3- ca., 15 mm, ; $ , 30 mm. 



Three males, three females, all imagines, and one female, sub- 

 imago, are present in the Collection ; all collected at M'fongosi, 

 Zululand, October, 1911, by W. E. Jones. 



FIG. 12. Forceps of Eedyurus ptringueyi. i . 



I have placed the species in the genus Eedyurus, although with 

 some hesitation. The highly elongated and narrow forewings, the 

 proportion between the length of the tarsi and tibiae and the shape of 

 one of the claws, which is curved and plainly pointed, make in some 

 degree the place of the species difficult to determine. The propor- 

 tion between the length of tarsal joints is the same as in the genus 

 Eedyurus ; but the pale colour gives the species much likeness to a 

 species of Heptagenia. In " A Eevisional Monograph of Eecent 

 Ephemeridae or Mayflies " (Trans. Linn. Soc., Lond., 1881), p. 309, 



A. E. Eaton mentions a specimen (?) of Eedyurus, taken by 



B. Trimen at Paarl. He says that the specimen " has a superficial 

 likeness to species of Heptagenia, but differs therefrom in the 

 proportion of its legs." 



