138 Bulletin of the Brooklyn Entomological Society Vol. XV 



or to an increase of two to three times atmospheric pressure 

 (Franckenberg). Because of this ready adjustment one can 

 understand very well how it is possible to find Corethra at the 

 surface of a lake during the night, — say at nine o'clock in late 

 June, and at the bottom eighty feet down just an hour before, — 

 hence a change of two atmospheres pressure. 



9. Inspiration and Expiration in Adults. 

 In adult beetles (Hydrophilus, Dytiscus, Agahus, etc.) Brocher 

 found that certain spiracles are used primarily for inspiration, 

 and others for expiration, while still others remained function- 

 less. Depending upon the respective species, the thoracic spir- 

 acles might be used for inspiration or expiration. The same 

 held true for the first abdominal and caudal stigmata, which 

 were the chief ones used for either inspiration or expiration. 



Bibliography. 

 Only literature since 1905 is cited. For literature prior to that 

 date, see the articles of the authors quoted, especially those of 

 Portier, Brocher, Blunck, etc. Only the main publications of the 

 respective authors are cited, since many smaller articles were 

 mere preliminaries, summarized or elaborated in later papers, 

 which are noted in previous, easily accessible bibliographies. 



I. General. 



Biernatzki, R. 1910. Unsere Kenntniss vom Atmungsstofifwechsel der 

 Wassertiere. Int. Rev., 3, pp. 339^358. Collective Review. 



Brocher, F. 1909. Les Phenomenes Capillaires, leur importance dans la 

 biologie aquatique. Ann. Biol. Lac, 4, pp. 89-138, 44 fif. 



Dakin, W. J. 1912. Aquatic Animals and their Environment. The Con- 

 stitution of the External Medium, and its Effect upon the blood. 

 Int. Rev., 5, pp. 58-80. 



Musselius, A. v. 1914. Zur Biologie der Hydracarinen. Ann. Biol. Lac, 

 7, pp. 60-82, t. ff. 2. 



Schollmeyer, Alice. 1914. Argyroneta aquatica, Biologie mit besonderer 

 Beriicksichtigung der Atmung. Ann. Biol. Lac, 6, pp. 314-338, t. 

 ff. 12. 



Thienemann, A. 1913. Der Zusammenhang zwischen dem Sauerstoffge- 

 halt des Tiefenwassers und der Zusammensetzung der Tiefen- 

 fauna Seen. Int. Rev., 6, pp. 243-249. 



