on the Ephemeride. 63 
Palingenia lata. 
(Genitalia maris, Pl. III. fig. 18, 18 a b.) 
Palingenia lata, Walk. 1853. 
Tarsi postici uni-unguiculati. 
Adult. g, v. s. s. Ale et thorax fuliginosi. Pro- 
thorax lineis longitudinalibus fuscis impressis quinque, 
viz.: in medio una, latero-dorsalibus duabus, alterisque 
intermediis duabus. Pedes sub-fuliginosi, vel testaceo- 
cervini; tarsorum posteriores uni-unguiculati, proximis 
articulorum paulo ceteris longioribus. Abdomen supra 
fuscum. Sete lutescentes pilose. 
Long. corp. ¢ 20, set. supra 70, exp. al. 43 mm. 
Hab.—Silhet and Sarawak. 
The specimens from Borneo have paler legs than those 
from India. 
Genus PENTAGENIA. 
(Ala antica, Pl. I. fig. 6.) 
Palingenia (A), Walsh, 1862; Pentagenia, Walsh, 1863. 
Imago. Ale quatuor. Oculiintegri. Setarum media 
in ¢ brevissima, in ¢ ceteris parum brevior. Tarsus 
posticus quadri-articulatus; articulorum tres priores 
eequales, et quarto breviores; ungues dissimiles. Femina 
caret ovivalvula. Pedes forcipis quadri-articulati, secundo 
articulorum longissimo. 
Pentagenia vittigera. 
(Genitalia maris, Pl. IV. fig. 1.) 
Pal. vittigera, Walsh, 1862 ; Pent. vittigera, Walsh, 1863. 
Subimago. “ Ale opace, flavescentes.” 
Imago, v. s. s. ¢. “QOculorum partes superiores 
exemplaris viventis flavescentes, inferiores rubiginose.” 
(Walsh.) Medium dorsi fuliginosum ; latera venterque 
testacea, paucis segmentorum apicalium flavis exceptis. 
Nervi alarum pallidissime testacei, vel electro colorati ; 
plurimis nervorum transversalium in area’ marginali, 
puncto nodali subcostz, lineique infra eandem in quoque 
nervorum (preter unum) sequentium duorum, atris. Pedes 
