INSECTS 



183 



INtTLA 



Insects, classifications of : 



1. According to the wings 



Hymenoptera. 



Coleoptera. 



Orthoptera. 



Neurpptera. 



Hemiptera. 



Homoptera. 



Lepidoptera. 



Diptera. 



2. Chewing Insects=;Mandibulata 



Biting Insects 



Neuroptera. 



Orthoptera. 



Coleoptera. 

 Licking Insects 



Hymenoptera. 



Sucking Insects=Haustellata 

 Pricking Insects 



Hemiptera. 



Diptera. 

 Sipping Insects 



Lepidoptera. 



3. According to the degree of metamorphosis 



Heteromorpha 



Hymenoptera. 



Coleoptera. 



Diptera. 



Lepidoptera. 



Neuroptera (pars). 

 Homomorpha 



Orthoptera. 



Hemiptera. 



Neuroptera (pars). 

 Insect-bedSi ' Found in Lias strata, containing 



remains of insects, small fish, &c. . 

 Insect life, stages of, 1. Egg: first stage. 

 2. Larva: vermiform, with or without legs: 

 locomotive and voracious. 3. Pupa=Nymph: 

 quiescent, often enclosed in cocoon or other 

 covering. 4. Imago: perfect insect. 

 Insectivora, (in-sek-tiv'6-ra). [L. insectum, 

 insect; voro, I eat.] Insect eating animals= 

 Hedgehogs, shrews, moles, &c.: a division of 

 Mammalia* 



Insessores. (in-ses-so'rez). [L. insideo, I sit 

 upon.]=Perching birds=Passeres; a primary 

 division of birds, v. Vigors. Birds living 

 in pairs, building nests in trees, having 

 slender legs and flexible toes. Sub-division 

 ofl.: 



Fissorostres. 



Dentirostres. 



Conirostres. 



Scan sores. 



Teriuirostres. 



Instinct, (in'stinkt). [Instinctus, the Latin 

 word.] Definitions of L 1. "The perfor- 

 mance of complex acts absolutely without 

 previously acquired knowledge." 2. "Dis- 

 position operating without the aid of in- 

 struction or experience." 3. "A mental 

 power totally independent of organization." 

 4. "Habits acquired by adaptation, and 

 transmitted through many generations." 

 Insula Lesbos. A peak in the moon. 

 Insulators of electricity, Substances that do 

 not conduct electricity: glass, sulphur, shellac, 

 &c. 



Intaglio, (in-tal'yo). [The Italian word.] A 

 medal, coin, &c., in which the figures are 

 hollowed out. cf. Cameo. 



Integer, (iu'te-jer). [The Latin word.] A 

 whole number, cf. Fraction. 



Integral, (in'te-gral). [Integer, q.v.] Whole: 

 entire. /. calculus: a method of performing 

 the sxunmation of an infinite series of indefi- 

 nitely small terms. 



Integration, (in-te-gra'shun). The process of 

 the integral calculus. 



Integument, (in-teg'u-ment). [Inteftwientiim, 

 the Latin word.] Used generally for any 

 covering; specially for the skin. 



Intensity, (in-teu'si-ti)=Tension. T. \flight= 

 Brightness: depends on the quantity of light 

 that falls on a given space. /. of a sound= 

 Loudness: depends on the extent of the 

 vibrations producing it, being more intense 

 as the vibration increases in extent. 



Intercalary, ( in-ter'kal-a-ri ). [ Tntercalarix, 

 the Latin word.] Interposed. /. day: the 29th 

 February; a day interposed in the calendar 

 every fourth year. v. Leap year. 



Intercostal, (in-ter-kos'tal). [L. inter, between; 

 costa, rib.] /. muscles: the muscles of the 

 ribs: by the action of which the chest ia 

 expanded and contracted during inspiration 

 and respiration. 



Interference, (in-ter-fe'rens). /. of light; the 

 crossing of two rays of light, which proditcea 

 darkness. Sound: the crossing of two rays 

 of sound. Spectrum: produced by using a 

 grating instead of a prism, v. Spectrum. 



Intermaxillary,(in-ter-mak-sil'la-ri). [L. inter, 

 between; Maxillary, q.v.] = Prscmaxillary : 

 bones between and in front of the maxillte 

 in Vertebratae, in which the upper incisor 

 teeth are inserted. 



Interosseous artery; in the arm, between the 

 radicle and ulnar arteries. 



Intervals, (in'ter-valz). In music: the ratio 

 of the vibrations required to produce two 

 given notes is the interval between them. 



Intervertebral foramina. Openings between 

 the vertebrae through which the spinal 

 nerves pass off. 



Intestinal, (in-tes'ti-nal). [Intestines, q.v.] 

 I. animals: Oken's term for Invertebrata. 

 /. canal = Intestines, q.v. L juice=&uccns 

 entericus: an alkaline secreted by the in- 

 testines. 



Intestines, (in-tes'tinz). [L. intestinus, in- 

 ternal.] A long tube reaching from the 

 stomach to the rectum, in man much con- 

 voluted divided into small intestines and 

 large intestines. 



Intestine animals. Oken's term for Polyps. 

 Intrados, (in-tra'dos). [The French word.] The 

 inner curve of an arch or vault, cf. Extrados. 

 Intumescence, (in-tu-mes'ens). [L. intumesco, 



I swell.] Swelling: expansion. 

 Intussusception, ( in-tu-sus-sep'shun ). [L. 

 intus, within; suscipio, I take.] Receiving 

 inwardly: absorption. 



Inula, (in'u-la). [The Latin name.] An herb 

 belonging to Asteraceee. /. helenium: Ele- 

 campane. /. conyza = Ploiighman's spike- 

 nard. /. crithmoides= Golden samphire. 



