[476]

The chief work on the internal anatomy of Hemiptera is still Dufour's Recherches anatomiques et physiologiques sur les Hémiptères, Mem. Savans Étrangers, Paris, iv. 1833, p. 129.

[477]

Künckel, Ann. Soc. ent. France (4) vii. 1867, p, 45, and C.R. Ac. Paris, cxx. 1895, p. 1002.

[478]

In Slingerland's Cornell Univ. Bull. No. 58, 1893, p. 222.

[479]

SB. Ak. Wien. xci. 1 Abth., 1885, p. 275.

[480]

Les Insectes fossiles, etc., 1894, p. 452.