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Panama (type locality), Costa Rica. Costa Rica: Atlantic slope; known from the Barva transect to 500m, Penas Blancas Valley at 800m.
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.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.
Figures 5, 19
Worker diagnosis. Body covered by continuous vermiculate rugae; petiolar node considerably elevated and subtriangular; dorsum of postpetiole with about six long hairs, and with a raised prominence medially; subpostpetiolar process present and well developed; first tergite of gaster devoid of long hairs.
Holotype measurements. HL 0.60; HW 0.55; ML 0.22; SL 0.38; EL 0.09; WL 0.68; PSL 0.11; PL 0.24; PPL 0.13; GL 0.79; TL 2.65; CI 92; SI 68; OI 17.
Worker measurements (n=2). HL 0.61-0.65; HW 0.60-0.63; ML 0.21-0.24; SL 0.39; EL 0.11-0.13; WL 0.71-0.74; PSL 0.16-0.17; PL 0.25-0.30; PPL 0.13-0.14; GL 0.79-0.80; TL 2.70-2.94; CI 97-98; SI 62-66; OI 17-21.
Worker description. Color red ferruginous to brown, with lighter appendages. Head and mesosoma finely covered by continuous vermiculate rugae, transverse on anterior portion of pronotum, grading to longitudinal on the rest of promesonotum, mesopleura and lateral faces of propodeum; mandibles with few and short longitudinal striae restricted to basal portion; petiole and postpetiole finely and irregularly rugose. Abundant pilosity on head and dorsum of promesonotum; dorsum of petiolar node and postpetiole with about three and six long hairs, respectively; first tergite of gaster entirely devoid of long flexuous hairs.
Head longer than broad, with vertexal margin convex; frontal lobes slightly rounded laterally; eyes with six to seven facets at greatest diameter. Promesonotum evenly convex in profile; metanotal groove relatively narrow and deeply impressed; propodeal spines straight; teeth of propodeal lobes widen basally, with about half-length of propodeal spines length. Petiolar node strongly elevated and subtriangular in lateral view; dorsum of postpetiole with a raised prominence medially and a well developed anteroventral projection directed anteriorly.
Gyne (first description). Differing from worker by having about 12 facets at eyes maximum diameter; dorsum of petiolar node and postpetiole with about five and 10 long hairs, respectively; first tergite of gaster with around 10 long flexuous hairs on the anterior third, near postpetiolar insertion (see picture in the "Ants of Costa Rica" website).
Etymology. Dr. Marion M. Smith (1944) named this species in honor of Dr. Caryl Parker Haskins (1908- 2001), in recognition for his contribution to the study of ant biology.
Comments. This species is most similar to Lachnomyrmex regularisHNS, but can be easily distinguished from the latter by the smaller size, more irregular rugulation, and presence of fine short rugae on postpetiole dorsum. Workers of L. fernandeziHNS and L. mackayiHNS can also be confounded with L. haskinsiHNS, but they present long flexuous hairs at least on the anterior third of the first gastral tergite.
Lachnomyrmex haskinsiHNS has been recorded from Costa Rica and Panama, in 200-800m elevation wet forests. Workers are usually collected in samples of sifted leaf litter. Dr. John Longino observed a few workers, one with a larva, scattered throughout the debris of a BrachymyrmexHNS nest he was collecting from beneath rotten wood on the forest floor (Longino 2007).
Additional material examined. COSTA RICA: Alajuela: Rio San Lorencito , 1990, P. Hammond col. (1 worker) [BMNH]; Heredia: La Selva Biological Station GoogleMaps, CCL, 10°43'N 84°01'W, 15.vii.1986, J. Longino col., no. INBIOCRI002280138 (1 worker) [INBC] GoogleMaps; same locality, 23.x.1991, J. Longino col., no. INBIOCRI001237374 (1 gyne, examined by images) [INBC] GoogleMaps; Limon: Cerro Cocori, Fca. de E. Rojas , 9- 30.xi.1992, E. Rojas col., no. INBIOCRI000900198 (1 worker) [MZSP] GoogleMaps.
Found most commonly in these habitats: 15 times found in mature wet forest, 13 times found in montane wet forest, 6 times found in wet forest, 1 times found in Puesto9,257g, 10m., 1 times found in SCH, 1 times found in 2º lowland rainforest, 1 times found in Lindero Sur, 1 times found in moist forest.
Found most commonly in these microhabitats: 23 times ex sifted leaf litter, 13 times Hojarasca, 1 times Sifted leaf litter sample. GIS 1800,900. All swampy, litter thin, much of it sam, lachnomyrmex; workers, one with larv times night collecting near blacklight #3. #3403, 1 times ex sifted leaf litter on ground, 1 times Camino toma de Agua.
Collected most commonly using these methods: 16 times miniWinkler, 10 times Winkler, 11 times Mini Winkler, 1 times maxiWinkler, 2 times Berlese.
Elevations: collected from 30 - 850 meters, 336 meters average