Ephemeridae from South Africa. 



183 



or streak of the same colour at each side ; the side spots do not 

 touch the front margin of the segments. On the underside of the 

 2nd-7th segments there are found the same markings as on the 

 upper. 



Limbs of the forceps yellowish, the basal joint with a greyish tint. 

 Penis not visible. Femur of foreleg reddish brown, tibia dark 

 reddish brown, yellowish at the base ; all the tarsal joints yellowish, 



FIG. 5. Forewing of Centroptilum bifasciatum. <? . 



reddish brown towards apex. Femora of intermediate and hind- 

 legs reddish brown, yellowish at the base ; tibiae and tarsi yellowish. 

 Wings vitreous with the greater part of nervures light brown. Fore- 

 wings with the marginal areas and an abrupt, oblique fascia 

 brown coloured ; along the hind border is found a faint brown 

 shadow. A few cross-veins in the front and middle part of the wing 

 blackish brown. Hindwing brown towards the apex. 



FIG. 6. Hindwing of Centroptilum bifasciatum. $ . 



The female differs from the male in the colouring of the abdomen. 

 2nd-7th segments dorsally reddish with vitreous spots especially at 

 the sides, ventrally with a reddish brown streak at the sides of the 

 segments. In the forewing the abrupt fascia and the brown shadow 

 along the hind margin are wanting. Hindwing without brown apex. 

 Sub-imago ( $ and ? ). Thorax greyish brown. Abdomen light brown, 

 ventrally paler. Setae greyish brown, paler in the male. Fore 



