Calosoma (Callitropa) palmeri Horn, 1876

Calosoma palmeri Horn, 1876: 199 (described from: Guadalupe island); type material: unspecified number of specimens, repository not stated. 1 syntype in Museum and Institute of Zoology, Warsaw (Mroczkowski, 1960: 377); 1 syntype ♂ in Museum of Comparative Zoology, Harvard University, Cambridge, Ma. (https://mczbase.mcz.harvard.edu/)
Calosoma (Paracalosoma) palmeri Breuning, 1928: 121
Callisthenes (Paracalosoma) palmeri Lapouge, 1932: 383
Callitropa (Paracalosoma) palmeri Jeannel, 1940: 215
Calosoma (Paracalosoma) palmeri Gidaspow, 1959: 276
Calosoma (Callitropa) palmeri Erwin, 2007: 99


Length 18-22 mm. palmeri is a small, brachipterous species, entirely shiny black, for which Breuning (1927) had created the subgenus Paracalosoma. It has a posteriorly narrowed pronotum, oval elytra, widened at the rear, with very superficial striae.
It is found only on Isla Guadalupe, a large island that belongs to the Baixa California, about 270 km from the coast, but Erwin (2007: 99) reported a single capture on an island of the San Benito archipelago, much more close to the coast.

Examined specimens and literature’s data
Mexico. Baja California: Guadalupe (AMNH, MNHN, NMB), southern part of Guadalupe island 430m (www.inaturalist.org/obs/72186029), Guadalupe, summit of the island 2500ft (AMNH)

Notes: Brachypterous. Lives on lowland and midlands up to the summit of the mountains at 750/1000m. Adult active individuals have been found in January and March, in the period in which most rainfall occurs.
The species is named after Edward Palmer (1829–1911), a self-taught botanist and archaeologist. Palmer, British-born but soon emigrated to America, collected natural specimens in the southwestern United States, Florida, Mexico (including Baja California), and South America, for the Smithsonian and many other Institutions.

http://insects.oeb.harvard.edu/MCZ/
Calosoma (Callitropa) palmeri
Horn, 1876
Mexico Guad(alupe) Is(land) (syntype)
(coll. and photo: Museum of Comparative Zoology,
Harvard University, Cambridge, Massachusetts, USA)
Calosoma (Callitropa) palmeri
Horn, 1876
California, Is. Guadalupe
(coll. Naturhistorischen Museum Basel)

Calosoma (Callitropa) palmeri
Horn, 1876
Guadalupe, summit 2500ft, 2.III.1911
(coll. American Museum of Natural History, New York)
Calosoma (Callitropa) palmeri
Horn, 1876
Southern California, Guadalupe
(coll. American Museum of Natural History, New York)

updated July 31 2021

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