Entomology for beginners; for the use of young folks, fruitgrowers, farmers, and gardeners; . recently remarked by Dr. Sharp, probably onlyfrom a fourth to a tenth of the existing species of insectsare known; and as McLachlan has stated, it is not im-probable that the number of species of insects now livingon the earths surface will be found to be about 1,000,000. The number of described species of American insects NUMBER Of SPECIES OF INSECTS. 53 north of Mexico has been stated by Mr. J. A. Lintner (1886)to be as follows: Species. Hymenoptera 4450 Lepidoptera: Butterflies (Edwardss List, 1884
Entomology for beginners; for the use of young folks, fruitgrowers, farmers, and gardeners; . recently remarked by Dr. Sharp, probably onlyfrom a fourth to a tenth of the existing species of insectsare known; and as McLachlan has stated, it is not im-probable that the number of species of insects now livingon the earths surface will be found to be about 1,000,000. The number of described species of American insects NUMBER Of SPECIES OF INSECTS. 53 north of Mexico has been stated by Mr. J. A. Lintner (1886)to be as follows: Species. Hymenoptera 4450 Lepidoptera: Butterflies (Edwardss List, 1884, 614; Scudders estimate, 1887) 500 Larger Moths (Grotes Check List, 1882), 3184—additions since making 3271Tineidse (Chamberss List, 1878, not in-cluded in Grotes List) 779—4550 Diptera (Osten-Sackens estimate in 1878) 2500 Coleoptera (Henshaws List of 1885, 9238; up to 88, 275) 9513 Hemiptera: Homoptera (Uhlers estimate) 1200 Heteroptera (Uhlers Check List, 1886).... 1448—2648 Orthoptera (Scudders estimate) 450 All other orders, not estimated; perhaps 1000 25,111. QSdipoda xanthoptera, CHAPTER OF INSECTS. HAVING examined the locust with the aid of the fore-going description, the student should make his studiescomparative by carefully examining a cricket and a greengrasshopper. Then he might turn to the following de-scriptions of examples or types of the order of whiteants, dragon-flies, hugs, beetles, flies, moths, bees, etc., andas the result of his work he will be able to grasp the factthat the species of insects, as a rule, have bodies composedof seventeen segments, which are arranged in three regions,viz., a head, thorax, and hind body or abdomen; lhat thethorax bears two pairs of wings, and three jmirs of jointedor segmented legs j that they breathe by internal air-tubesopening externally by spiracles, and that in growing theyeither develop directly, or undergo a complete metamorphosis. The class of insects is divided or classifi
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