[326]

Beitr. Anat. Perla maxima. Inaug.-Diss. Aarau, 1881.

[327]

Entom. Month. Mag. xxix. 1893, p. 249.

[328]

No satisfactory systematic work of a general character on British Perlidae exists. References to the scattered descriptions and notes will be found in the Catalogue of British Neuroptera published by Entom. Soc. London, 1870.

[329]

Mem. Ac. Pétersb. (7) xxxvi. No. 15, 1889.

[330]

Insectes fossiles, etc., p. 407, 1893.