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Costa Rica: mid-elevation Atlantic slope and Osa Peninsula from sea level to 700m.
The types were collected by Phil Ward at Llorona in Corcovado National Park, on a palm trunk in rainforest, 100m elevation. Llorona is a coastal site with rainforest-covered bluffs. The pilosity on the types differs strongly from Atlantic slope material, and material from the Osa cloud forest needs to be examined again. The types have abundant, short, almost wooly pilosity. The Atlantic slope material has only moderately abundant pilosity, and the hairs are very long.
Pheidole sicariaHNS new species
Types Mus. Comp. Zool. Harvard.
Etymology L sicariaHNS, with dagger, assassin.
Diagnosis A member of the diligensHNS group, most similar in habitus to scimitaraHNS of Peru, distinguished by the following traits. Major: brown; antennal scape slightly exceeding occipital border; propodeal spine as long as the basal propodeal face; postpetiole from above laterally angulate; head capsule swollen, so that venter is strongly convex, and Head Width exceeds Head Length; humerus subangulate in dorsal-oblique view; anterior third of pronotal dorsum carinulate; head lacking rugoreticulum; anterior third of central strip of first gastral tergite shagreened.
Minor: propodeal spine as long as basal propodeal face; occiput narrowed, with nuchal collar. Measurements (mm) Holotype major: HW 1.20, HL 1.16, SL 1.04, EL 0.22, PW 0.60. Paratype minor: HW 0.62, HL 0.72, SL 1.00, EL 0.14, PW 0.42.
Color Major: body, mandibles, and scape medium brown; rest of appendages light to yellowish brown. Minor: body light brown, appendages yellowish brown.
Range Mid-elevation, Atlantic slope; also upper elevation, to 700 m, Osa Peninsula of Costa Rica (J. T. Longino 1997).
Biology Known from mid-elevation rainforest and cloud forest. The types were collected by P. S. Ward on a palm trunk. Longino (1997) found two nests respectively in a clump of aroid roots and in loose dead leaves and fragments of carton lodged on the branch of a small Ocotea tree, whose hollow stems harbored a colony of MyrmelachistaHNS.
Figure Upper: holotype, major. Lower: paratype, minor. COSTA RICA: Llorona, Corcovado National Park (Philip S. Ward). Scale bars = 1 mm.
Found most commonly in these habitats: 52 times found in montane wet forest, 3 times found in montane wet forest, in matrix of pasture and forest, probabl old 2nd growth, 7 times found in wet forest, 1 times found in primary wet forest edge, 1 times found in cloud forest treefall, 1 times found in montane wet forest, 1-day old treefall, 1 times found in rainforest, 1 times found in mature rainforest, near pasture edge, small stream through forest, 1 times found in montane moist forest, 1 times found in montane wet forest, along ridge leading to stream, oak trees present, probably mature or old 2nd growth with relict trees, near pasture, ...
Found most commonly in these microhabitats: 4 times beating veg., 5 times pan trap, 1 times in clump of accreted organic matter, 1m high, 1 times common in clearing, 1 times nest in epiphyte mat, 2 times en el suelo, 1 times nest under epiphytes, aggressive workers, 1 times nest in loose debris in low vegetation, 2 times bajo de M/17, 2 times Sobre Vegetacion, 1 times sobre rama, ...
Collected most commonly using these methods: 40 times Malaise, 4 times beating, 9 times search, 5 times Pan Trap, 5 times flight intercept trap, 2 times Sweeping, 1 times miniWinkler, 1 times maxiWinkler.
Elevations: collected from 500 - 1100 meters, 961 meters average