BIBLIOGRAPHY OF ECONOMIC ENTOMOLOGY. 319 



2267. [EiLEY, C. V., et a?.] Continued. 

 CHAPTER IX Continued. 



Xylotrechus colonus Fabr., 2o7Clytu8 (?) larva on black-birch, 

 259 The ribbed rhagium, h. lineatum Oliver. 259 The lesser 

 prionus, Orthosoma Irunneum De Geer, 260 Unknown longicorn 

 borer from an oak log, 261 Unknown longicorn borer in syca- 

 more, 262. 

 CHAPTER X: 

 The embryological development of the locust. By A. S. Packard, jr. 263 



Formation of the blastoderm, 263 Origin of the primitive amoeboid 

 cells, 264 The blastodermic disc or primitive band, 264 The 

 germinal groove, 264 Origin of the cellular or germinal layers, 

 . 264 Diagrammatic view of the origin of these layers, from Gra- 

 ber, 265 Embryonal membranes, 265 Serous membrane, 265 

 Amnion, 265 Tabular view of the eight embryonal layers, 265 

 Division of the embryo or primitive band into body segments, 

 266 Development of the appendages, 266 ; of the nervous sys- 

 tem, 266 ; of the alimentary canal, 266 The stomodseum, 266 

 The proctodseum, 267 The meseuteron or stomach, 267 The 

 pyloric appendages of the stomach, 267 The Malpighian tubes, 

 267 The genital glands, 267 The tracheae and salivary glands, 

 267 Spinning glands, 267 Development of the wings, 268 Crit- 

 icism of Gegenbaur's views, 269 Fritz Miiller's views, 269 

 Speculation on the primary origin of wings, 270 Correlation of 

 metamorphosis with the acquisition of wings, and of the latter 

 with the ripening of the sexual organs, 271 Differentiation of 

 mesonotum and metanotnm dependent on the presence of wings, 

 271 Development of a pupal stage, 271 Genealogy of the or- 

 ders of insects, 271. 

 The embryological development of orthopterous insects. By A. S. 



Packard, jr 271 



Rapid development of the embryo in autumn, 272 Embryology of 

 Gryllotalpa vulgaris, 272 Formation and contraction of the em- 

 bryonal skins, 272 Formation of the digestive canal, 272 Func- 

 tions of the mid-gut and hind-gut, 273 Origin of the Malpighian 

 vessels, salivary glands, tracheae, and ovaries, 273 The sections 

 of eggs studied by the author, prepared by N. N. Mason, 273. 

 Development of Caloptenus atlanis. By A. S. Packard, jr 273 



Rapidity of development in locust eggs laid in autumn, 273 Requi- 

 sites for the observation of stages earlier than those studied, 273 

 Method of preparation of the eggs studied, 274 Structure of the 

 nervous system and eyes, 274 : of the heart, 274 Mode of origin 

 of the heart, 274 Contents of the heart, 274 Structure of the 

 tracheae, 275 ; of the digestive canal, 275 Relations of the proc- 

 todaeum to the amnion, 275 Structure of the Malpighian tubes, 

 276 The yolk cells and yolk granules, 276. 

 Development of Caloptenus spretus. By A. S. Packard, jr 277 



The primitive segments, 277 The nervous system, 277 The tra- 

 cheae, 278 The digestive canal, 278 Details of structure in more 

 advanced embryos, 278 Structure of eyes, 278 Origin of ocelli, 

 278 Relations of antenna}, eyes, clypeus, and labruui to the pro- 

 celaphic lobes, 279 Structure of brain and other ganglia, 279 

 Relations of mandibles and the two pairs of maxillae, 279 Rela- 

 tive development of legs, 279 Sections of embryo about ready 

 to hatch, 279. 



