A text-book of entomology, including the anatomy, physiology, embryology and metamorphoses of insects, for use in agricultural and technical schools and colleges as well as by the working entomologist . dium are the numerous tenent hairs,or holding hairs, which are modified glandular setaeswollen at the end and which give out a minutequantity of a clear adhesive fluid (Figs. 108, 109,130, 134). In larval insects, and the adults of certainbeetles, Coccidse, Aphidae, and Collembola, which haveno empodium, there are one or more of these teneiithairs present. They enable the insect to adhere tosmo
A text-book of entomology, including the anatomy, physiology, embryology and metamorphoses of insects, for use in agricultural and technical schools and colleges as well as by the working entomologist . dium are the numerous tenent hairs,or holding hairs, which are modified glandular setaeswollen at the end and which give out a minutequantity of a clear adhesive fluid (Figs. 108, 109,130, 134). In larval insects, and the adults of certainbeetles, Coccidse, Aphidae, and Collembola, which haveno empodium, there are one or more of these teneiithairs present. They enable the insect to adhere tosmooth surfaces. Striking sexual secondary characters appear in thefore legs of the male Hydrophilus, the insect, asTuffen West observes, walking on the end of the tibiaalone and dragging the tarsus after it. The last tarsaljoint is enlarged into the form of an irregular hollowshield. The most completely suctorial feet of insectsare those of the anterior pair of Dyticus (Fig. 132).The under side of the three basal joints is fused together and enlargedinto a single broad and nearly circular shield, which is convex above R FIG. 107. —Endof tibia anil tarsaljoints of Anoph-thalmus; t, comb. n< ch. Fi<;. 108. —Transverse section through a tarsal joint of Telephorus, a beetle : ch, cuticula of theupper side; in, its matrix ; ch, the sole ; m, its matrix : 7i, adhesive hair; &, tactile hair, suppliedwith a nerve (»), and arising from a main nerve (it I ; n, ganglion of a tactile hair; 1, section ofmain trachea, from which arises a branch i/i; //. glands which open into the adhesive hairs, andform the sticky secretion; e, chitinoiis thickening; x, sinew; /;, membrane dividing the hollowspace of the tarsal joint into compartments. See p. 111. — After Dewitz. and fringed with fine branching hairs, and covered beneath withsuckers, of which two are exceptionally large; by this apparatus of 100 TEXT-BOOK OF ENTOMOLOGY
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectinsects
