Entomology : with special reference to its biological and economic aspects . ? ,1 1 ,„,,,, \ ^ ^.,, domesticiis. h, bladder-like hair: c, cutic- Fenp ancfa amcncaiia. \ om , , ,, j ? r ula; h, hypodermis; n, nerve; ns, non- Rath has described four kinds sensory sets; sc, sense cell; sh, sensory hair.— After VOM R.\th. of sense hairs trom the two larger of the four caudal appen-dages of a cricket, Gryllus; someof these (Fig. 134) may be olfac-tory, though possibly tactile. Thesame author found on the terminalpalpal segment in various Lepidop-tera a large flask-shaped invagina-tion (Fig. 135) in
Entomology : with special reference to its biological and economic aspects . ? ,1 1 ,„,,,, \ ^ ^.,, domesticiis. h, bladder-like hair: c, cutic- Fenp ancfa amcncaiia. \ om , , ,, j ? r ula; h, hypodermis; n, nerve; ns, non- Rath has described four kinds sensory sets; sc, sense cell; sh, sensory hair.— After VOM R.\th. of sense hairs trom the two larger of the four caudal appen-dages of a cricket, Gryllus; someof these (Fig. 134) may be olfac-tory, though possibly tactile. Thesame author found on the terminalpalpal segment in various Lepidop-tera a large flask-shaped invagina-tion (Fig. 135) into which pro-ject numerous chitinous rods, eacha process of a sensory cell, whichis supplied by a branch of the prin-cipal palpal nerve; these peculiarorgans are inferred to be chief reason for regard-ing these various end-organs asolfactory is that they appearT„„.„?•, , ,. f r from their structure to be better l^ongitudinal section of apex of palpus of Fieris. c, cuticuia; h, adapted to recei\e that kind of an impression than any other, so. hypodermissc, sense cells nerve; s, scales;-After VOM R.\Tn. I02 ENTOMOLOGY far as we can judge from our own experience. Though it iseas)^ to demonstrate that the antennae, for example, are olfac-tory, it frequently happens that the antennse bear several dis-tinct forms of sensory end-organs, so minute and intermingledthat their physiological differences can scarcely be ascertainedby experiment but must be inferred from their peculiarities ofstructure. Schenk, however, has arrived at precise resultsby comparing the antennal sensilla in the two sexes, selectingspecies in which the antennse exhibit a pronounced sexualdimorphism, in correlation with sexual differences of Notolopluis (Orgyia) antiqiia, in which the male seeksout the female by means of antennal organs of smell, he findsthat the male has on each antenna about 600 sensilla ccelo-conica and the female only 75 ; similarly in the geometrid Fi
Size: 1202px × 2079px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectentomology, bookyear1
