Lachnomyrmex haskinsi M. R. Smith 1944

Myrmicinae, Formicidae, Hymenoptera, Insecta, Arthropoda, Animalia

worker face view

worker lateral view

Queen lateral view (reduced, original).


Panama (type locality), Costa Rica. Costa Rica: Atlantic slope; known from the Barva transect to 500m, Penas Blancas Valley at 800m.


Worker: first gastral tergum devoid of erect setae; dorsum of postpetiole with a raised, subtriangular boss medially, and with a single row of about 6 long flexuous setae along anterior margin; dorsum of mesosoma with rugae organized into somewhat continuous wavy rugae, transverse on anterior pronotum, grading to longitudinal on rest of promesonotum; cephalic dorsum with rather sparse, vermiculate rugae; compound eyes small (eye length less than or equal to 0.15mm), with about 7 facets at maximum diameter; mesosoma length (WL) less than 0.85mm; dorsum of postpetiole with short and weak rugulation laterally; gaster slightly darker than the rest of body.

Queen: First gastral tergum with about 10 long erect setae, in an anterior band near the postpetiolar insertion, rest of tergum with extremely short appressed setae barely visible on the polished surface; postpetiole dorsum with a raised subtriangular boss medially; Weber's length less than 1mm.

Similar species: longinoi, regularis.

Natural History

Workers and queens occur in samples of sifted leaf litter from the forest floor. I observed a few workers, one with a larva, scattered throughout the debris of a Brachymyrmex nest I was collecting from beneath rotten wood on the forest floor.


The type locality is Barro Colorado Island in Panama. I examined the USNM holotype worker in August, 1998. It appears identical to the Costa Rican material of haskinsi.

See also revision by Feitosa and Brandčo (2008).

Literature Cited

Feitosa, R. M., and C. R. F. Brandčo. 2008. A taxonomic revision of the Neotropical myrmicine ant genus Lachnomyrmex Wheeler (Hymenoptera: Formicidae). Zootaxa 1890:1-49.

Page author:

John T. Longino, The Evergreen State College, Olympia WA 98505 USA.

Date of this version: 1 April 2009.
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