On tlie Respiratory Conditions of tlie Larva 
and Pupa of Donaciae. 
By 
Richard Ege, 
From tlie Laboratories of Biological fresli-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 witb the respiration of 
these insects we have learned from the works of Per ris 1 ), 
v. Siebold 2 ), Schmidt-Schwedt 3 ), Mac Gillivray 4 ) and 
Bøving 5 ). x 
I shall of the anatomical and biological facts only mention a 
few; for a farther study I may refer to the above mentioned 
Authors. 
*) Ann. de la Soc. entomologique de France II Ser. VI Bd. 1848. 
2 ) Reported after Bøving. 
3 ) Berlin, entom. Zeitsch. Bd. 81 and 88. 1887 and 1889. 
4 ) New York State Museum Buil. 68. Entomology. 1908. 
6 ) Donaciin-Larvernes Naturhistorie. Disp. 1906 and Internat. Revne der 
Hydrobiologie und Hydrographie Biol. Supp. I Serie 1910. 
