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Genus Tychius

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Tychius meliloti Stephens new to Canada with a brief review of the species of Tychius Germar introduced into North America...
By R.S. Anderson and A.T. Howden
The Canadian Entomologist 126(6): 1363-1368, 1994

all four spp. listed are in the guide, but the ranges might have changed significantly since 1994

Classification of the weevil subfamily Tychiinae, with a new genus and species, new combinations, and new synonymy in Lignyodini
By Clark W.E., Warner R.E., Whitehead D.R.
The Coleopterists Bulletin 31: 1-18, 1977

Revision of the weevil genera Magdalinops Dietz and Chelonychus Dietz (Coleoptera: Curculionidae, Anthonomini)
By Clark, W.E. and H.R. Burke
The Coleopterists Bulletin, 56: 107-122, 2002

New Rhynchophora II (Coleoptera, Curculionidae).
By Sleeper, E.L.
The Ohio Journal of Science, 54(3): 180-186., 1954
Full PDF

Sleeper, E.L. 1954. New Rhynchophora II (Coleoptera, Curculionidae). The Ohio Journal of Science, 54(3): 180-186.

Atlas and checklist of the bark and ambrosia beetles of Texas and Oklahoma (Curculionidae: Scolytinae and Platypodinae)
By Atkinson T.H., Riley E.G.
Insecta Mundi 02920: 1-46, 2013

Bark beetles and pinhole borers (Curculionidae, Scolytinae, Platypodinae) alien to Europe
By L.R. Kirkendall, M. Faccoli
Zookeys 56: 227–251, 2010

On the Biologies of the Rhynchophora of North America
By Pierce, W.D. 1907.
State Journal Co., Lincoln, Nebraska., 1907
Full Text

Pierce, W.D. 1907. On the biologies of the Rhynchophora of North America. Nebraska State Board of Agriculture Zoological Report (1907): 247-319.

In the place of submitting myself a report for publication this year in the annual volume of the State Board of Agriculture, it has seemed to me appropriate to print a thesis for an advanced degree which was offered by one of the students in this department last year. Mr. Pierce has devoted a long time to the study of the biology, life histories, and activities of the group of weevils which are so numerous in every situation and so destructive to all varieties of plant life. The primary element in meeting their ravages is to secure knowledge of what particular form is at work and in what manner it carries out its devastations, what parts of the food plant are attacked and where the different phases of its life cycle are passed.

A catalog of Coleoptera of America North of Mexico. Curculionidae: Acicnemidinae, Cossoninae, Rhytirrhininae, Molytinae...
By C.W. O'Brien
USDA Agriculture handbook no. 529-143g. 49 pp., 1997
Full text

Full title: A catalog of Coleoptera of America North of Mexico. Family: Curculionidae. Subfamilies: Acicnemidinae, Cossoninae, Rhytirrhininae, Molytinae, Petalochilinae, Trypetidinae, Dryophthorinae, Tachygoninae, Thecesterninae

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