On the Respiratory Conditions of the Larva 
and Pupa of Donaciae. 
By 
Richard Ege. 
m the Laboratories of Biological fresh-water 
research at Hillerød and of Zoophysiology at the University 
of Copenhagen. 
The insects are typical airliving and airbreathing animals; 
among those that live in the water one will therefore be able to 
find a series of interesting adaptations to the aquatic life especi- 
ally with regard to the respiration and the respiratory organs. 
One of the most remarkable examples of such an accomodation 
to the aquatic life we have in the Donaciae, which as well during 
their larval and pupal life as in a time of the Imago state are 
living in the water. 
The notable circumstances connected with the respiration of 
these insects we have learned from the works of Perris!), 
v. Siebold?), Schmidt-Schwedt?), Mac Gillivray!) and 
Bøving). 
I shall of the anatomical and biological facts only mention a 
few; for a further study I may refer to the above mentioned 
Authors. 
") Ann. de la Soc. entomologique de France II Ser. VI Bd. 1848. 
”) Reported after Bøving. 
3) Berlin, entom. Zeitsch. Bd. 31 and 38. 1887 and 1889. 
1) New York re Museum Bull. 68. Entomology. 1903. 
ig ii es Naturhistorie. Disp. 1906 and Internat. Revue der 
Hydrobiologie RE Hydrographie Biol. Supp, I Serie 1910. 
