xviii LIST OF ILLUSTRATIONS. 
FIG. PAGE 
40. The Trachea of an Insect [2].......... 0. ce eee e eee eee tt 38 
41. Cockroach and Cast Skin [1].......... ce. cee ce ee eee rere 39 
42. The Nervous Chain of a Cockroach [1]..........0000e eee ett 40 
43. Portion of the Cornea of a Fly’s Compound Eye [1]...---++-- 41 
44. The Hearing Organ ofa Cricket [1]...........000 00 eee ree 41 
45. The Stridulating Organ of a Cricket [1]...........-0 0 eee 42 
46. Antennze of Lepidoptera [4]...... 0.6... cee eee ee eee eet 46 
47. Eggs of Lepidoptera [4]......... 0.00. cece eee ee ee ee eres 47 
48. Some Larva of Lepidoptera............ 0. cece cece eee tes 48 
49. Some Cocoons and Chrysalids [4].............c0 ee eee eee 48 
50. A Cabbage-butterfly .......... ccc ce cece eee eee nents 49 
51. Head of a Moth.......... cece cece cece eee ee ee ere eeete 50 
52. The Kallima....... 2... cece eee cee cece cence eee n eee tees 51 
53. Catocala Nupta [4]....... cece eee e cece cece teen nee cence 52 
54. The Milkweed-butterfly 53 
55. Limenitis Ursula ........... Taeseatostornielw ais 53 
562, Moth at Rest... soci ieee eae saibieaswe toate mene een ene 55 
56d. Butterfly at Rest... 0.0... ccc ccc ccc nen enn ee etneeenes 55 
57. Larva and Pupa of the House-fly [1].......... ee eee eee eee 53 
58. Right Winglet of Bluebottle [1]..... 0.2... ce eee e ee eee ee eee 58 
59. Balancer of Bluebottle [1] ........... eee cece eect eee e cena 58 
60. Portion of a Fly’s Foot [1]..... 0... .e cece ee cee e tence eens 59 
61. Side View of Proboscis, partly opened [1]...........2s0eeeee 59 
62. Head of Bluebottle [1]......-.... cece eee eee ee eee eens 59 
63. Eggs of Milkweed-butterfly ....... 00... cece eee renee - 68 
64. Larva of Milkweed-butterfly.... 0.0.0... cece cece e eee - 69 
65. Pupa of Milkweed-butterfly ........ 0... 0. cece eee cece eee 69 
66. Female and Male Aphis... 0.2.0... ccc cece eee ee eee eee eee 71 
67;, A. Microgaster Flyin os cas ceancea seine gadeas eaeenienet aes 75 
68. ‘The Dragon-fly [2]. isc 0s 00 cscaswsewns sue swan ve 77 
69. The Imago of a Dragon-fly [2] 78 
70. Caddis-fly, Adult and Larval Cases [2]............0. eee eee 79 
71. The Growth of a May-fly [2]..... 0... cece cece eee eee eee 80 
72a A Water boaltinain occa cose creas, arivesacguavaiayin ei sie eh aussavbedpdvenscese rang sloniosd 81 
730: Dytieus Mar ginalis 3 3...< sers.csxeinivene dieie ds aie een oaielednc ere 81 
Te. MOUtR OF a, BUG isa. sse.cssie dia sxcchacoccxerarabinccrane eta a seisiawers viata Wels 82 
75. The Egg-raft of a Mosquito [3].......... 00sec eeeeeeeeeeee 82 
76. The Life-history of a Mosquito ........... 0. 0c cc ee ce eee eee 83 
77. The Mouth of a Female Mosquito [2] .........-....2ceeeeee 84 
78. The Leg of a Cockroach [1] 2.0... 0... cece eect cece eens 86 
79; As Mole=criCket xis seiees wivcareescoranais ane an vs ERB ice ne Poa 86 
80, Fore Legs of a Water-bug [2].............. 0. ccc cece neces 87 
Sr. Legsiof Dyticus: [allie saison aulee see we eevee hase dooq eased acane 87 
82. Fore Leg of a Butterfly [q].............. ccc cece eee ee eee 88 
83; Alive bees 0: yieccsore-sa's ea aieseaeias a aia aanse SB sid seers corey secrag satan eare cence go 
84. Fertilization of a Flower by an Insect....................0., 9 
85. A. Spider's; Leg [2] o-ccswswamadse act scan Ste nen nomi Peg 94 
86. Water-spider and Nest ........... 0.00. e cece eee eee eee, 96 
87. Side View of Crayfish [5].............. 02 cece eee eee e eee ee 101 
88. Dorsal View of Crayfish [5]............ 0.0 eee e eee eee eee, 102 
89. Ventral View of Crayfish [5]......... 00 cee eee eee e eee e ey 103 
