Ephemeridae from South Africa. 181 



of the same length. 1st tarsal joint of foreleg very short, 2nd the 

 longest, 3rd, 4th, and 5th gradually shorter. 



Forewing very elongated ; hindwing oblong and oblique ; its 

 marginal area abbreviated and very broad. Membrane of wings 

 hyaline ; neuration brownish ; a great part of the cross-veins in 

 foi'ewings clouded with brownish. Hindwings with many cross- 

 veins. 



Length, 7 mm. ; forewing, 8 mm. ; setae, 17 mm. 



One specimen, a male, from Cape of Good Hope, January, 1817, 

 in the Westermannian Collection in the Museum of Copenhagen. 



The species differs from Adenophlebia dislocans, especially in the 

 oblong form of forewings, and it is with some hesitation that I put 

 the species in that genus ; but as it agrees with the type species of 

 the genus in neuration of wings, in form of hindwing, of the tarsal 

 claws, as well as in the proportion of the length between femur, 

 tibia, tarsus, and tarsal joints I place it provisionally in that genus. 



GEN. TRICORYTHUS, Eat. 

 TRICORYTHUS DISCOLOR, Burm. 



Oxycypta discolor, Burmeister, Handb. der Ent., ii., 1839, p. 797. 



Cloeon discolor, Walker, Cat. Neur. Ins., Brit. Mus., iii., 1853, 

 p. 577. 



Caenis discolor, Eaton, Trans. Ent. Soc., Lond., 1871, p. 96. 

 Hagen, Trans. Ent. Soc., Lond., 1873, p. 399. 



FIG. 2. Forewing of Tricorythus discolor. 



Tricorythus discolor, Eaton, " Rev. Monogr. of Recent Epheme- 

 ridae," London, 1884, p. 139. 



Imago. $ . Head black, pro-, meso-, and metathorax castaneous. 

 Abdomen dorsally greyish yellow-brown, hind borders of the seg- 



