The Journal of microscopy and natural science . ^.A yine, aainut ct£i. ENEMIES OF APHIDES. 375 II.—Fore part of head not ])rolonged into a distinctbeak. A.—Skin firm. 1. Skin scarcely extensible, palpi not seated ona common chin piece. (a) Chelicerffi, claw or needle like; Palpiterminated by pair nippers ... TrombidiidcePalpi, with bristles or hook at end ... HydracJmidce (b) Chelicerae, with nippers ; first joint of Palpi very large ... ... OribatidcE Joints of Palpi nearly equal ... Cramasidce 2. Skin leathery, very extensible \ Palpi attach-ed to a chin plat
The Journal of microscopy and natural science . ^.A yine, aainut ct£i. ENEMIES OF APHIDES. 375 II.—Fore part of head not ])rolonged into a distinctbeak. A.—Skin firm. 1. Skin scarcely extensible, palpi not seated ona common chin piece. (a) Chelicerffi, claw or needle like; Palpiterminated by pair nippers ... TrombidiidcePalpi, with bristles or hook at end ... HydracJmidce (b) Chelicerae, with nippers ; first joint of Palpi very large ... ... OribatidcE Joints of Palpi nearly equal ... Cramasidce 2. Skin leathery, very extensible \ Palpi attach-ed to a chin plate ... ... ... Ixodidce B.—Skin soft, with few chitinous bands ... ... Acaridce EXPLANATION OF PLATE XVII. Fig. 1.—Acarus (species ?) attacking Aphis on apple leaf (from amounted specimen shewing both in natural positions). ,, 2.—Larva of a Trombidium, with Poppy Aphis on leaf. Thislarva was apparently parasitic of the aphis. ,, 3.—Leg of larva in last figure. ,, 4.—Palpi and mouth parts of Trombidium holosericeuni. ,, 5.—L
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Keywords: ., bookcentury1800, booksubjectmicroscopes, booksubjectmicroscopy
