Descent of Man, i. 1890, p. 338; The views of Landois and Recker, Arch. f. Naturgesch. lvii. 1, 1891, p. 101, are erroneous.
See J. Linn. Soc. Zool. xiii. 1876, p. 161.
For many particulars as to respiration of Dytiscus, and peculiarities of the larva see Miall, Aquatic Insects, 1895, pp. 39, etc. (In the figure given on p. 60 the large stigma on the terminal segment of the abdomen is omitted, though it is referred to in the text.)
For classification and structure see Sharp, "On Dytiscidae," Sci. Trans. R. Dublin Soc. (2) ii. 1882.
Descriptions of larvae that may possibly be those of Paussids have been published by Xambeu, Ann. Soc. Linn. Lyon, xxxix. 1892, p. 137, and Erichson, Arch. Naturgesch. xiii. 1847, p. 275.