Ceratina strenua

Synonyms: Smith, 1879
Ceratina metallica, Zadontomerus metallica

Descriptions of New Species of Hymenoptera in the Collection of the British Museum by Smith, 1879, pg. 97.
Proceedings of the Academy of Natural Sciences of Philadelphia, 1897: New and Little-known North American Bees by Cockerell, pg. 353.
Transactions of the American Entomological Society, 1907, Vol. 33, by Smith, pp. 116 to 122.
Proceedings of the Entomological Society of Washington, 1935, Vol. 37 by Sandhouse, pp. 93 to 94 Keys, pg. 65 Description.
American Museum Novitates, 1936, #844 by Michener, pg. 2 and 11.
Annals & Magazine of Natural History, 1937, Series 10, Vol. 19, by Michener, pg. 404: Not available.
Entomological News, 1960, Vol. 71: Biological Notes on some Hymenoptera that Nest in Sumach Pith,  by Krombein, pg. 68.
North Carolina Agricultural Experiment Station, 1962, Technical Bulletin #152: Bees of the Eastern United States by Mitchell, pp. 500 to 507.
University of Georgia, 1976, Thesis: The comparative biology of two species of small carpenter bee, Ceratina strenua F. Smith and C. calcarata Robertson (Hymenoptera: Xylocopinae) by Kislow. Not Available.
Journal of the Entomological Society of Ontario, 2008, Vol. 139 by Rehan and Richards, pg. 60 & Keys pp. 65 to 66.
Zootaxa, 2011 #2873: Morphological and molecular delineation of a new species in the Ceratina dupla species-group (Hymenoptera: Apidae: Xylocopinae) of eastern North America by Rehan and Sheffield, pp. 35 to 43.

Holotype as Ceratina strenua male by Smith, 1879. Type Locality: Texas. In the British Museum of Natural History, London, England.

Holotype as Ceratina metallica male by Smith, 1907. Type Locality: Sunbury, Pennsylvania (Baker). Museum unknown.