_on the Bphemeride. 59 
tumescens, margine antico in angulo prominente pro- 
ducto.”” (Pict.) 
Exp. al. 9 26 mm. 
Hab.—New Orleans. 
It is doubtful whether this species can bere-determined. 
Genus ASTHENOPUS, nov. gen. 
(Ala antica, Pl. I. fig. 3.) 
Palingenia, p., Walk. 1853; Campsurus (B), Htn. 1868. 
Imago. Oculiintegri. Al quatuor. Pedes debiles 
veluti in Campsuro. 6 Sete duz longe ; pedes forcipis 
tri-articulati; prothorax transversus. ¢ Seta intermedia 
brevissima, vel obsoleta. 
The wing figured belongs to an undescribed species 
from Texas, specimens of which are in Mr. M’Lachlan’s 
collection. 
Asthenopus curtus, n. sp. 
(Genitalia maris, Pl. ITI. fig. 14, 14 a b.) 
Palingenia albifilum, var., Walk. 1853; P. curta, Hag. 
MS. 1861; Campsurus curtus, Ktn. 1868. 
Imago 3, v.s.s. Prothorax transversus piceus ; meso- 
et meta-thoraces lutei. Alee antice obscurate costas versus, 
nervis transversalibus areze marginalis apicis paucis, sim- 
plicibus et subrectis. Pedum antici fusci; posteriores 
lutei. Abdomen. supra nigricans, subtus ochraceum, 
immaculatum ; segmentum singulum supra lined longitu- 
dinali media, punctoque rotundato utrinque, pallidioribus. 
Setze albee. 
Long. corp. g 8, al. 10, set. 35 mm. 
Hab.—Para. 
Asthenopus dorsalis. 
Palingenia dorsalis, Burm. 1839. 
Imago ¢,8. 8s. Prothorax transversus, tumescens, 
lutescens, maculi in medio violacei. Caput nigricans. 
Ala antica nervis fuscescentibus, et margine costali vio- 
