PLATS IT. 



THE MAY FLY. -GREEN AND GREY DRAKE. 



(Ephemera vulgata.j 



A. — Digestive apparatus of Ephemera (magnified.) a, Hearl. 5, Portions of digestive apparatus, 

 inflated ""with air-bubbles, c, Stomach, with rudimentary biliary tubes. rf, Entangled mass of 



secreting organs generally called renal, e, Anus. /, Caudal seta?. G, Ovaries, (magnified.) 

 H, Ova. (mag. 20 diam.) I, Portion of biliary vessel in immature (sub-imago) insect, shewing 



curiously shaped bodies marked with concentric lines, (magnified.) J, Small portion of ditto 



more highly magnified. K, The curious organs (1, front view. 2, side view) resembling forms of 



Naviculae, mag. 400. L, Membranous biliary filament m perfect insect (imago) containing the 



above-named bodies, mag. 200. M, Single renal vessels. N, External respiratory orgai 



nympha. O, Front leg of female imago. P, ditto of male. Q, Spermatozoa. R, Blood corpuscles, 



highly magnified. B.— Nympha of Ephemera vulgata, (magnified.) C— Nat. size. 



D.— Under side of last segments of male imago, shewing, o, clippers, and position of setaceous 



appendages at b. 



