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Like Calocosmus robustus, this is a highly polymorphic species with regard to maculations of the head, pronotum, scutellum, and elytron. It is allied with the group of large, robust species that include Calocosmus robustus and Calocosmus melanurus. It is distinguished from Calocosmus melanurus by having the tibiae partially and tarsi completely piceous (the tibiae are completely and the tarsi are at least partially fulvous in Calocosmus melanurus). The antennae of Calocosmus nigritarsis are nearly completely black with, at most, only the extreme bases of a few antennomeres fulvous (Calocosmus melanurus and Calocosmus robustus have the antennal fulvous annulations more pronounced). In almost all specimens of Calocosmus nigritarsis, the pronotum has a large, anteromedial black macula (at most a small spot in Calocosmus robustus and absent in Calocosmus melanurus.
This species was previously known from only a few specimens. Fieldwork in the Dominican Republic has produced many additional specimens that have better elucidated the level of polymorphism of the elytral and pronotal maculations.
New distributional data
Dominican Republic, La Vega Province, Parque Nacional Armando Bermudez, km 1–3 along trail west of La Ciénega, 900-1100 m, Specimen ID 7609, 24 June 2005, Nearns & Lingafelter (1 specimen, USNM); Dominican Republic, Independencia Prov., Road 47, between Los Pinos and Ángel Félix, 760 meters, 18°36.986'N, 71°46.556'W, 20 June 2005, N. Woodley (1 specimen, USNM); same data, but Nearns & Lingafelter (1 specimen, ENPC); Dominican Republic, La Vega Province, Jarabacoa, La Joya, 537 m, Rancho Baiguate, 10 June 2005, G. Nearns (1 specimen, ENPC); Dominican Republic, La Vega Province, 4.1 km southwest El Convento, 18°50.37'N, 70°42.48'W, 1730 m, 31 May 2003, J. Rawlins, R. Davidson, C. Young, C. Nuñez, P. Acevedo, dense secondary evergreen forest with pine, hand collected, sample 22242, CMNH 329,960 (1 specimen, CMNH); Dominican Republic, Santiago Province, Parque Nacional Armando Bermudez, La Guacara, 19°07'N, 71°02'W, 1124 m, 10 July 1992, M. A. & R. O. Ivie (1 specimen, WIBF); Dominican Republic, La Vega Province, 5.1 km N. Manabao, 5 June 1994, R. Turnbow (1 specimen, RHTC); Dominican Republic, La Vega Province, Constanza, 17 July 199, R. Turnbow (1 specimen, RHTC).
- Lingafelter, S; 2013: Hispaniolan Hemilophini (Coleoptera, Cerambycidae, Lamiinae) ZooKeys, 258: 53-83. doi