194 i February, 



the femur, and the hind tarsus three-thirteenths as long as the hind 

 tibia. Type, A. australis (in Ephemera), Walk. Syn., Leptophlebia, 

 ser. 1, Etn., 1871 (exclusive of the last two reputed species). Distrib., 

 S. Africa, Ceylon, Australasia, Japan, and S. America. 



B- — Anterior margin of hind-wing suddenly refracted before the apex, 

 somewhat as in fig. 245, of Trans. Ent. Soc. Lond., 1871, pi. iv. 



Adenophlebia, n. g. 



Three long, sub-equal caudal setae, in $ about twice as long as the 

 body. Pore tibia of J about one and one-sixth as long as the femur, 

 the tarsus about one and one-fourth as long as the same ; hind leg about 

 one and a half as long as the intermediate leg ; hind tarsus little over 

 one-third as long as the hind tibia ; ungues of the hinder tarsi alike 

 in form, uncinate. Proximal joint of $ forceps' limb far longer than 

 the rest put together. Type, A. dislocans (in Ephemera), Walker, the 

 $ of L. auriculata, Etn., 1871. Syn., Leptophlebia, ser. 1 (part), and 

 idem, ser. 2 (L. Colombia, Walk.), Etn., 1871. Distrib., S. Africa; 

 and apparently many Malay and Tropical American species belong 

 here. 



Choroterpes, n. g. 



Three long, sub-equal caudal setae ; lateral setae of $ about one 

 and one-fifth as long as the body. Fore tibia of $ about one and 

 eight-thirteenths as long as the femur, the tarsus about one and a half 

 as long as the same ; hind leg about one and five-thirteenths as long 

 as the intermediate leg ; hind tarsus nearly two-fifths as long as the 

 hind tibia ; hinder ungues dissimilar in form and size. Proximal joint 

 of $ forceps' limb short, the next joint by far the longest (somewhat 

 as in Ephemerella) . Nymph latent, with seven pairs of foliaceous 

 abdominal tracheal branchiae, sparsely and very minutely hairy along 

 their edges ; 1st pair single, the blade entire, linear lanceolate, and 

 acuminate ; the remainder double, both divisions of each nearly alike, 

 ovate, acute, proliferous or else deeply incised on both sides at the 

 base of the produced points, and obliquely sub-cordate at the base. 

 Type, Gh. lusitanica, n. sp. Distrib., Portugal; and, perhaps, De Greer's 

 Ephemera vespertina, L. (though its gills are not proliferous nor 

 auricled), indigenous to Scandinavia, may belong here. 



The sub-imago rests with the outer caudal setae divergent, the 

 fore legs raised, so as to prorect the tibia and tarsus, and held apart. 



Choroterpes lusitanica, n. sp. 



Sub-imago. Wings purplish-black throughout. Legs and setse dark piceous; 

 tibife and tarsi at first rcrldish-piceous. 



