Colobopsis umbratilis

Identification
Wheeler (1934) - In sculpture and color this subspecies shows a distinct approach to Colobopsis bryani, which was also taken on Viti Levu (at Golo-i-Sova, by E. H. Bryan).

Distribution based on Regional Taxon Lists
Indo-Australian Region: Fiji.

Nomenclature

 *  umbratilis. Camponotus (Colobopsis) manni subsp. umbratilis Wheeler, W.M. 1934e: 420, fig. 4 (w.m.) FIJI IS. Combination in Colobopsis: Ward, et al., 2016: 350. Raised to species: Sarnat & Economo, 2012: 55.

Worker
Length, 3.5 mm.

Differing from the typical manni in sculpture and coloration. Head, pro- and mesonotum more shining, reticulately rugulose, the rugae finer and more irregular than in bryani, longitudinal only between the frontal carinae and on the posterior portion of the pronotum. Gular surface of head smooth and shining. Antennae, femora and tibiae dark brown; lower pleurae, coxae and ventral surface of petiole blackish. The spines and posterior peduncle of the petiole are of the same length as in manni.

Male
Length, 4.4 mm.

Indistinguishable in form, sculpture and color from the male of dentatus, except in the shape of the petiole, which is cylindrical and without trace of a node, with straight horizontal dorsal surface; from above decidedly broader in front than behind, with each of the anterior corners produced as a rounded tubercle, bearing the spiracle on its summit. In typical dentatus the petiole is thicker, convex above, less widened anteriorly and with the spiracles on the anterolateral surfaces.

Type Material
Described from five workers and a male from Nadarivatu, on Viti Levu Island (W. M. Mann). Three of the workers are in the Museum of Comparative Zoology.

References based on Global Ant Biodiversity Informatics

 * Sarnat Eli M. 2009. The Ants [Hymenoptera: Formicdiae] of Fiji: Systematics, Biogeography and Conservation of an Island Arc Fauna. 80-252
 * Ward D. 2008. Ecological partitioning and invasive ants (Hymenoptera: Formicidae) in a tropical rain forest ant community from Fiji. Pacific Science 62(4): 473-482.
 * Ward, Darren F. and James K. Wetterer. 2006. Checklist of the Ants of Fiji. Fiji Arthropods III 85: 23-47.
 * Wheeler W.M. 1935. Check list of the ants of Oceania. Occasional Papers of the Bernice Pauahi Bishop Museum 11(11):1-56.
 * Wheeler, W. M. 1934. Some aberrant species of Camponotus (Colobopsis) from the Fiji Islands. Annals of the Entomological Society of America 27:415-424.
 * Wheeler, William Morton.1935.Checklist of the Ants of Oceania.Occasional Papers 11(11): 3-56