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1 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. 
A . — Anterior margin of hind-wing suddenly refracted before the apex, 
somewhat as in fig. 24 b, of Trans. Ent. Soc. Lond., 1871, pi. iv. 
Adenophlebia, n. g. 
Three long, sub-equal caudal setae, in J 1 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 A 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 (X. colombice, Walk.), Etn., 1S7L. Distrib., S. Africa; 
and apparently many Malay and Tropical American species belong 
here. 
Choeotekpes, n. g. 
Three long, sub-equal caudal setae ; lateral setae of A about one 
and one-fifth as long as the body. Pore tibia of g 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, Oh. lusitanica, n. sp. Distrib., Portugal ; and, perhaps, De Geer’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 set* divergent, the 
fore legs raised, so as to prorect the tibia and tarsus, and held apart. 
ClIOROTERPES LUSITANICA, 71 . Sp. 
Sub-imago. Wings purplish-black throughout. Legs and setse dark piceous ; 
tibiae and tarsi at first reddish-piceous. 
