584 EPHEMERINJi. 



Ephemera hilaris, Say, Journ. Acad. Nat. Set. Phil. viii. 43. 



White, minute : eyes black, double: stethidium pale fulvous : 

 pleura and pectus with a few abbreviated, dusky lines : abdomen de- 

 pressed, with three brownish punctures on each side towards the tip : 

 setae long : wings ample ; costal border slightly dusky. Length 

 one-tenth of an inch. 



Indiana. 



14. Cenis diminuxa, Mas. 



Fulva ; abdomen testaceum ; seta alba, corpore quadruplo lon- 

 giores ; pedes al hi, antici fasciis daabus vel tribus nigricanti- 

 bus ; alee limpida, venis albis ad costam nigricantibus. 



C. hilaris, var. ? 



Male. — Tawny : abdomen pale testaceous, not longer than the 

 thorax : setae white, about four times the length of the body : legs 

 white: fore-legs with two or three blackish bands: wings limpid ; 

 veins white, blackish along the fore border. Length of the body 1£ 

 line : of the setae 6 lines ; of the wings 3 lines. 



a. St. John's Bluff, E. Florida. Presented by E. Doubleday, Esq. 



15. C.enis Sinensis. 



Fusco-fidva, subtus testacea ; antenna albida, articulis \o et 2o 

 apice fuscis ; thorax testaceo bivittatus ; abdomen album, basi 

 et apice fuscum ; alee limpidce, venis albis. 



Brownish tawny, testaceous beneath : antennae whitish ; tips 

 of the first and second joints brown : thorax with two slender, tes- 

 taceous stripes: abdomen white, hardly twice the length of the 

 thorax, brown at the base and towards the tip : wings limpid, veins 

 white, few and slender. Length of the body 2 lines ; of the wings 

 4 lines. 



a. China. Presented by G. T. Laye, Esq. 



