. Cuvier's animal kingdom : arranged according to its organization. Animals. TRACHEARIiE. 471. Fig. 41.â«, Hydrach: fied ; c, young lar à , mai^ni* or rounded, and generally soft : in some males, it is narrowed behind into a cylindrical tail. The number of eyes is either two or four, and even six, according to Miiller. Efilaix, lias the chelicerae terminated by a moveable claw. A. extendens, Fabr. Ilydrachna, Latr., has the mouth composed of plates, forming' a projecting sucker, and the palpi have a moveable appendage beneath the extremity. A. geographicus, Fabr., A. globator, Fabr. Li
. Cuvier's animal kingdom : arranged according to its organization. Animals. TRACHEARIiE. 471. Fig. 41.â«, Hydrach: fied ; c, young lar à , mai^ni* or rounded, and generally soft : in some males, it is narrowed behind into a cylindrical tail. The number of eyes is either two or four, and even six, according to Miiller. Efilaix, lias the chelicerae terminated by a moveable claw. A. extendens, Fabr. Ilydrachna, Latr., has the mouth composed of plates, forming' a projecting sucker, and the palpi have a moveable appendage beneath the extremity. A. geographicus, Fabr., A. globator, Fabr. Limnochares, Latr., has the mouth sucker-shaped, but the palpi are simple. A. aquaticus, Linn. [Other species of these water-mites have been described by M. Theis, in the Annales des Soi. Nat, for 1832]. [From the very valuable discoveries lately made by M. Dugès, it appears that these water-mites undergo metamorphoses, accompanied by a complete change of form, the larvae having a very large head and legs, whilst the pupae are inactive, attaching themselves, by a single pair of legs, to the bodies of other aquatic insects, and consisting, as it were, simply of an oval bag with a narrow neck, the insect in this state having been formed, by M. V. Audonin, into the genus Achlysia, and specifically named A. Dytici, from taking up its residence beneath the elytra of the Water Beetle (Dyiicus marginalis). They also attach themselves to the slender filaments com- posing the tails of the Water Scorpions (Nepa and Ranatra).] Other Mites {Micropthira, Latr.) differ from all the foregoing, in having six legs. They are all parasites. Caris, Latr., has the sucker and palpi distinct; the body rounded, very flat, and covered with a scaly skin. C. vesperiilionis, Latr. On Bats. [M. V. Andouin has figured an insect which he considers may be identical with Caris vespertilionis, in the Annales des Set. Nat., 1832 ; and which, notwithstanding its possessing only six legs, he considers as
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Keywords: ., bookcentury1800, bookdecade1840, bookpublishe, booksubjectanimals
