File:The Intellectual observer (1865) (14781553641).jpg

Identifier: intellectualobse61865lond (find matches)
Title: The Intellectual observer
Year: 1862 (1860s)
Authors:
Subjects: Science
Publisher: (London : Groombridge and Sons)
Contributing Library: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
Digitizing Sponsor: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library

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nderthe mistaken notion that it was produced from a case larva. That the grey-drake is only the female green-drake metamor-phosed, or rather after the last pellicle is cast, may be some-times readily proved by dissection. The marble and whiteskin of the female grey-drake may be seen by carefullyslitting open or peeling off the first integument of the green-drake. The expressions green and grey drakes, as applied to theMay-flies by anglers, owe their origin to the fact that thewings of the artificial fly are made from a mallards feather,dyed olive for tbe green-drake, or immature condition of-theinsect; and from the same feather slightly stained with purplefor the grey-drake, or perfect form of the female. The figure on the left-hand blade of grass in Plate I.represents the female green-drake, which changes into thegrey-drake, seen resting on the right-hand blade, leaving hercast-off pellicle upon the grass stem, as seen in the engraving.The flying insect is the perfect male. PLATS IT.
Text Appearing After Image:
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

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