192 
January, 1881. 
HoilfEONEURIA, n. g. 
Akin to Lachlania. Wing-membrane as in Spaniophlebia. Fore- 
wing with undivided longitudinal nervures, and no cross-veinlets ; 
three sub-equal caudal set?B, in $ about one-fourth as long as the body 
and glabrous. Type, R. Salvinice , n. sp. Distrib., Central America. 
R. Salvinice, n. sp. 
Imago, ^ > dried. Head and thorax above smooth, black ; wing-neuration 
fuscous ; legs pale (discoloured) ; back of abdomen fuscous, with pale joinings, belly 
pale ; setae black. Long, corp., 9 , 11, al. 11 — 12, set. 3 mm. 
Uab. : Guatemala. 
Asthenopus, Etn., = Campsurus, Etn. 
Jolia, n. g. 
Allied to Polymitarcys. Median caudal seta) abortive in both 
sexes. Neuration of the wings rather similar to that of Polymitarcys. 
Nymph agile, with seven pairs of abdominal trachseal branchia? of 
uniform make, each consisting of an obovate membranous lamina, with 
a fascicle of filaments annexed to its hinder base (almost similar to 
the trachaeal branchiae of Reptagenia) . Fore femur and tibia fringed 
within with dense stiff hair, as in Oligoneuria (tarsus slender). Man- 
dibles not prolonged into a tusk ; their lobes slender and acute. 
Caudal setae natatorial, about seven-tenths as long as the body ; the 
latei al setae ciliated internally, and the median seta plumose for up- 
wards of half their length, and then tail-pointed. Type, J. Rceselli 
(in Pahngenia ), Joly. Distrib., the Garonne, near Toulouse, in Sep- 
tember. Drawings and specimens were most kindly transmitted to 
me by Dr . E. Joly ; and I caught three nymphs last August at 
Toulouse. 
Rhoekanthus, n. q. 
Very like Potamanthus (restrict.), but with the median caudal 
seta aborth e in both sexes ; lateral setae in £ upwards of twice as long 
as the body (in Potamanthus one and a-half times). Type, Ph. 
speciosus, n. sp. Distrib., Lahat. 
Rhoenanthus speciosus, n. sp. 
Subimago dried. W ings whitish, with most of the cross-veinlets well bordered 
with sanguineous, excepting those near the inner and terminal margins, where the 
wing-membrane is more or less tinted with ocliraceous. 
Imago dried. $ , mesonotum lutescent or brownish-luteous. Fore-leg pale 
ochraceous, with the apex of the femur, the base and apex of the tibia, and the 
tarsal joinings tinged with purple or sanguineous j ungues dissimilar : posterior legs 
with the tarsal joints very narrowly tipped with sanguineous. Wings vitreous ; 
