H. Hagen

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Synopsis of the Neuroptera of North America. With a List of the South American Species

H. Hagen, 2010 .

Synopsis of the neuroptera of North America. With a list of the South American species. Prepared for the Smithsonian institution by Hermann Hagen.

H. Hagen, P. R. Uhler, 2012 .

Monograph of the earlier stages of the Odonata. Sub-families Gomphina and Cordulegastrina

H. Hagen, 1885 .

A synopsis of the Odonat genus Leucorhinia Britt

H. Hagen, 1890 .

H. Hagen, 1885, Nature.

Notes and Descriptions of Some North American Libellulina—Synopsis of Neuroptera Second Edition

H. Hagen, 1890 .

Synopsis of the Neuroptera of North America

H. Hagen, P. R. Uhler, 2009 .

Descriptions of Some North American Cordulina

H. Hagen, 1890 .

Hemerobidarum Synopsis synonymica

H. Hagen, 1866 .

The Probable Danger from White Ants

H. Hagen, 1876, The American Naturalist.

MONOGRAPH OF THE EMBIDINA

H. Hagen, 1885, The Canadian Entomologist.

Monograph of the North American Astacidae

H. Hagen, 2008 .

COLEOPHORA LARICELLA Hb. VERY INJURIOUS TO LARIX EUROPEA, IN MASSACHUSETTS

H. Hagen, 1886, The Canadian Entomologist.

THE HESSIAN FLY NOT IMPORTED FROM EUROPE

H. Hagen, 1880, The Canadian Entomologist.