X SYA^OPS/S. 



ORDER VII.— OKTHOPTERA. 



Blaltidic, I02. Head of cockroach, 102; unconsolidated 

 thoracic rings, extension and compression of abdomen, 102; 

 mode of breathing, 102; Plateau's figures, 102, 103. Small 

 eyes and long antennoe, 103, Biting mouth parts, 103. Pecul- 

 iar structure of legs correlated with habits, 103. Wings of male, 

 of female, 103. Habit of the female of forming a sac and car- 

 rying the eggs and young, 103. Simplicity of structure of larval 

 cockroach, 103. Miall and Denny on The Cockroach, 104. 

 References to Huxley's Invertebrata, Rolleston's Forms of Ani- 

 7nal Life, and Scudder's Pakcozoic Cockroaches, 104. Ectobia 

 gernianica, 104; remarkable habits of insect, 104. Ancient 

 and wild cockroaches, 105; adaptations of structure acquired 

 before man's appearance on earth, 105; adaptations favorable 

 for a life of semi-domestication, 105 ; needed investigations on 

 the effects of domestication on structure of existing cockroaches, 

 105. Phasmidae, 105. Protective coloration, 105. Wallace on 

 the Origin and Uses of Color in Animals, 106, Unconsolidated 

 condition of the thorax correlated with absence of wings, 106. 

 Feet adapted for slow movements, 106. Gryllidce, 106. Struct- 

 ure of head, thorax, and abdomen, 106, 107. Mode of breath- 

 ing, 107. Structure of appendages, 107. Manner of produc- 

 ing the " chirp," 107. Effects of habit of burrowing upon 

 structure illustrated by Gryllotalpa borealis, 108. Locustidse, 

 108. Comparative work on the locust and meadow grasshop- 

 per, an instructive lesson for children, 108, 109. Acrididae, 109. 

 Caloptemis spretus, 109; ravages in the West, no. Tettix 

 or grouse locust, no; prothorax performing the work of wing- 

 covers, consequent reduction of the latter, no. General re- 

 marks on Orthoptera, no; similarity in habits and habitats 

 correlated with corresponding similarity in structure and devel- 

 opment, no. The Thysanuriform stage shown in generalized 

 Orthoptera, absent in specialized forms, ni. Resemblances of 

 the young of specialized forms to the adults, in. Objections 

 urged against the derivation of these insects from a Thysanuran 

 form, ni. Statement of the law of acceleration in develop- 

 ment, n2. Adequacy of this law to meet objections and to 

 account for absence of the Thysanuriform larva, 112. 



