Xll S VNOPSIS. 



Mass. Fish Commissioners, 123. Terrestrial Heteroptera, 124. 

 Habits oi Prio nidus cristatus, Glover's observations, 124. Sting 

 of Opsicfftus persona tiis painful, 125. Podisus spinosus, diet 

 of vegetable and animal juices, 126. Scutelleridae, 126. Extraor- 

 dinary size of mesothoracic scutellum, 126. Degraded forms 

 of Heteroptera, 126; habits and structure of Cimicidae transi- 

 tional to true parasitic habits and structure, 127; reduction of 

 fore-wings to scales, absence of hind-wings, condition of wings 

 correlated with condition of thoracic rings, 127, 128. Existence 

 of Cimicidse in a wild state considered doubtful, 128. Pyreth- 

 rum powder a preventive against the attacks of Cimex, 128. 

 Parasitica, 128. The Pediculina regarded by Packard and 

 Comstock equivalent to Heteroptera and Homoptera, 129. De- 

 graded structural characters of Pediculus not comparable with 

 simple, Campodea-like forms or larval forms, examples of special- 

 ization by reduction, 129. Adaptation in color to the races of 

 men infested, 129, 130. Homoptera, 131. Cicada an instruc- 

 tive insect for class-work, 131. Peculiarities of head and neck, 

 lateral motion of head reduced to a minimum, 132. Develop- 

 ment of thoracic region, huge size of the mesothorax correlated 

 with large size of first pair of wings, and small size of meta- 

 thorax with reduction of hind-wings, 132. Markings of the 

 thorax, Hagen's view, 132. Broad junction of the thorax and 

 abdomen, 132. Musical apparatus of the male, absence of ap- 

 paratus in the female, 132. Structure of the appendages of the 

 head, 132, 133. Membranous character of both pairs of wings, 

 133. Seventeen-year and thirteen-year Cicada, 133. New 

 England species. Cicada iibicen, 133. Grub-like form of larva, 

 133. Transformation of pupa into imago, 134. Children en- 

 couraged to make collections illustrating different stages in the 

 development, 134. Aphididae, 135. Color a means of protec- 

 tion, 135. Structure of winged and wingless female, 135. Ab- 

 dominal tubes and "honey-dew," 136. Parthenogenesis, 136. 

 Development of Aphis, 136. Effects of change of temperature 

 and failure of food on development, 137. Aphides in the 

 school-room, 137. Phylloxera, 138. General characters of tree- 

 hoppers, 138. Coccidse, 138. Adult female scale-insect an 

 example of specialization by reduction, 138. Development of 



