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THE AMERICAN NATURALIST [Vol. XLII 



insect by means of caudal appendages introduces numer- 

 ous air bubbles. 



The glands of Batelli secrete a mucilaginous substance 

 which, added to the anal fluid, renders it viscous and thus 

 causes the retention of the air bubbles. 



The so-called branchial appendages of Morse and of 

 Porta are merely plates of this mucilaginous secretion. 



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Stockholm. 1773. 



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Paris. 1900. 



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 Berol. 1720. 



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 1764. 



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1901. g g 



Morse, E. S. A Bubble-blowing Insect. Pop. Sci. Mon., pp. 23-29, New 



York, N. X. 1900 

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 Porta, Antonio. Bicerche sull' Aphrophora spumaria L. Milano, Bend. 



1st. lomb., 2. Serie, Vol. 33, pp. 920-928. 1900. 

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