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Mexico to Colombia (Fernandez 2003). Costa Rica: rainforests of Atlantic and southern Pacific lowlands.
Inhabits forest floor litter. Known from Winkler and Berlese samples. Mann (1922) observed small nests beneath stones in Honduras.
Fern‡ndez C., F. 2003. Revision of the myrmicine ants of the Adelomyrmex genus-group (Hymenoptera: Formicidae). Zootaxa 361: 1Ð52.
Mann, W. M. 1922. Ants from Honduras and Guatemala. Proc. U. S. Natl. Mus. 61:1-54.
Wheeler, W. M. 1910. Three new genera of myrmicine ants from tropical America. Bull. Am. Mus. Nat. Hist. 28:259-265.
Worker measurements. Holotype (other, n=9). HL 0.75 (0.57-0.70) HW 0.66 (0.53-0.66) SL 0.46 (0.38-0.41) EL 0.07 (0.05-0.07) WL 0.76 (0.56-0.70) GL 0.87 (0.68-0.87) TL 3.00 (2.31-3.00) CI 88 (90-100) SI 70 (66-73).
Worker diagnosis: Mandibles with 5 to 7 teeth decreasing in size from apical teeth. Eyes small, with approximately 10-12 ommatidia. Hypostomal tooth small, sharp pointed. Promesonotum evenly convex, dorsal face of propodeum very short. Metanotal groove deep, distinct. Propodeal spines higher than wide. Node with anterior and posterior faces more or less parallel, dorsal face nearly straight. Postpetiole lower than petiole, subquadrate, ventral carina well developed. Head, pronotum and mesonotum coarsely reticulate-rugose, with longitudinal rugulae at anterior part of head and more or less on the sides of mesosoma. Transverse rugae between propodeal spines and sides of petiole and postpetiole. Declivous face of propodeum ranges from smooth to covered with transverse rugae. Mandibles smooth or with longitudinal rugae feebly marked on outer half. Mandibles, legs and gaster usually smooth and shining. Hairs yellowish, long and flexuous on the body, more short and appressed on antennae and legs. Body black to dark brown, antennae and legs lighter, brown to yellowish.
Queen measurements: HW 0.65 HL 0.75 SL 0.44 EL 0.14 WL 0.83 GL 0.96 TL 3.12 CI 87 SI 68.
As worker with the typical modifications of myrmicine queen. Central anterior portion of promesonotum smooth and shining, posterior area with longitudinal rugulae. Metanotum coarsely rugo-reticulate. Pronotum rugo-reticulate. Sides of mesosoma with striation more or less longitudinal, most of katepisternum smooth and shining.
Material examined: MÉXICO: 1 w, Chiapas, 2.1 km NW Pueblo Nuevo, Solistahuacan, Yerbabuena Preserve, 2070 m , 23.ix.1992 R.S. Anderson No. 92-114 (LACM); 4 w, Chiapas 10 km S Palenque , 30.iv. 88, W. P. MacKay leg. No. 81058-2 (WEMC); 6 w, Puebla, Tezintlan Poc , 18.iv. 48, F. Bonnet leg. No. 1350 (USNM); 1 w, Tamaulipas, "S.A. de Guatemala", Rancho del Cielo, 1070m , 4.vii. 69, tall cloud forest , litter, S. & J. Peck (IAvH); GUATEMALA: 1 w, holotype, Livingston 10.87, Schwartz & Barber coll., Type No. 13198 (USNM), “ Apsychomyrmex myopsHNS ” (USNM); 1 w, Los Amates , Kellermann (LACM); 12 w, Mixco , W.M. Mann leg. (USNM); HONDURAS: 5 w, Lombardia , W.M. Mann leg. (USNM); 3 w, Pueblo San Juan (USNM); 2 w., 1 q., Pueblo San Juan , W.M. Mann (LACM); COSTA RICA: 2 w, Heredia, Estacion Biologica La Selva GoogleMaps, 10°26’N 84°10’W, 50-150m GoogleMaps, iii.1993, INBio-OET (INBio) GoogleMaps; 2 w, Heredia, 17 km S Puerto Viejo GoogleMaps, 10°18’N 84°02’W, 600m GoogleMaps, 20- 26.i.1989, J. Longino No. 2230-S (INBio) GoogleMaps; 4 w, Puntarenas, 19 km S Ciudad Neily GoogleMaps, 8°29’N 82°58’W, 20m GoogleMaps, 26.iii.1990, J. Longino No. 2658- S (INBio, ICN) GoogleMaps; 6 w, Puntarenas, Corcovado National Park GoogleMaps, 8°29’N 83°36’W, <100m GoogleMaps, 17.xii.1990, J. Longino No. 2768-S (INBio) GoogleMaps; 2 w, Puntarenas, Osa, Rancho Quemado GoogleMaps, 8°42’N 83°33’W, 2-300m GoogleMaps, 15.xii.1990, J. Longino No. 2760-S (INBio) GoogleMaps; 1 w, Puntarenas, P.N. Manuel Antonio GoogleMaps, 9°23’N 84°09’W, 40m GoogleMaps, 27- 28.vii.1985, J. Longino No. 633-S (INBio) GoogleMaps; 3 w, San José, H. Schmidt, B12 (MZSP); 2 w, Turrialba, 10.ii. 31 (MZSP); 1 w, San Lorencito , 1990, P. Hammond leg., (BMNH); 26 w, Santa Clara, Colombiana Farm , 1.iii. 24, W.M. Mann leg. (USNM); 1 w, without specific locality , F. Nevermann leg. (MZSP); PANAMÁ: 1 w, Barro Colorado Island , Canal Zone, 1.i. 60, W.L. Brown Jr. & E.C. McCluskey legg. 7-56 (MZSP); 3 w, Barro Colorado Island , x.41, J. Zetek No. 4879, Lot No. 41-20624 (MZSP); COLOMBIA: 1 w, Antioquia, Frontino, Orquideas National Park, Venados Cabin, 900 m. , 6.vi. 96, E.E. Palacio leg. (ICN); 1 w, Bolívar, Zambrano, Hacienda Monterrey, 50 m. , 22.x. 94, A. Molano leg. (ICN); 1 w, Chocó, Riosucio, Atrato River, La Gira , L.F. Mendoza leg. No. 045 (IAvH).
Comments. This species is variable in size, number of mandibular teeth, color and some minor aspects of morphology. In addition to the variation mentioned in Smith (1947:471), the propodeal declivity varies from smooth and shining to transversely rugose, with the number of rugae varying among specimens.
The worker from the Colombian Atlantic coast ( Bolívar State) has 5 mandibular teeth, and the first gastral segment is opaque and densely shagreened. I assigned this specimen to A. myopsHNS in light of the variability typical of several species of the genus.
In a Mexican worker (IAvH) the mandibular configuration differs conspicuously from the other workers in the species. There are two teeth in the basal margin, or the space between basal teeth of masticatory border and basal teeth was secondarily reduced. I await more material to take any taxonomic action.
A worker from Guatemala (Los Amates, LACM) is bigger (HW 0.71, HL 0.80, WL 0.79) and differs from the typical A. myopsHNS. The body sculpturing is coarser and more marked. The promesonotum forms a bulging convexity, notably higher than the propodeum, more than is typical for A. myopsHNS. As in the Colombian or Mexican workers, I await more material before taking any action. Guatemala, Nicaragua and Salvador are very poorly sampled for ants (and other insects) and several populations and species may be the key to resolving some taxonomic problems in A. myopsHNS.
Found most commonly in these habitats: 48 times found in tropical rainforest, 27 times found in mature wet forest, 23 times found in rainforest, 9 times found in 2º lowland rainforest, 5 times found in montane wet forest, 3 times found in wet forest, 1 times found in old cacao plantation, 5 times found in lowland rainforest, 1 times found in 2nd growth forest, 1 times found in 2nd growth riparian forest, ...
Found most commonly in these microhabitats: 127 times ex sifted leaf litter, 3 times Wet forest. Ex sifted leaf litter., 3 times sifted litter, 3 times Hojarasca, 1 times ex sifted litter; 6L sifted litter; extracted in Winkler sack over 32 hours, 1 times ex litter u. broad leaf plants, 1 times Wet forest; ex sifted leaf litter. Old second growth veg., 1 times Wet forest. Ex sifted leaf litter. Ridge just above La Cantarana. Km16 of Hartsh, 1 times Wet forest. Ex sifted leaf litter. 3 mesh sacks hung in Winkler bag for 2 days., 1 times Tall wet forest. Ex sifted leaf litter. 3.5 mesh sacks hung in Winkler bag for 3, 1 times on orchids, ...
Collected most commonly using these methods: 97 times miniWinkler, 23 times Winkler, 19 times MaxiWinkler, 1 times Berlese, 2 times Mini Winkler, 1 times search.
Elevations: collected from 10 - 1420 meters, 211 meters average
Type specimens: type of Adelomyrmex myops: usnment00531590