Myrmicinae, Formicidae, Hymenoptera, Insecta, Arthropoda, Animalia
Costa Rica: Cordillera Volcanica Central (Barva transect, 1100-1500m).
Minor worker: head length 0.83mm, head width 0.64mm, scape length 1.16mm, Webers length 1.14mm (n=1). Head rounded behind, vertex collar very narrow; promesonotal and metanotal grooves well impressed; propodeal spines short; face smooth and shiny, with small patch of foveae and widely-spaced striae in area between eye, frontal carina, and mandibular insertion; pronotum smooth and shiny with small amount of foveate sculpture anteriorly; mesopleuron and dorsal and lateral faces of propodeum uniformly foveolate; gaster smooth and shiny; scapes with abundant erect setae; face and mesosoma with abundant, long, flexuous setae; pilosity on upper surface of hind femur appressed; gaster with abundant erect setae; color dark brown.
Major worker: head length 1.42mm, head width 1.39mm, scape length 1.11mm (n=1). Face shiny throughout; mostly smooth, with widely-spaced striae grading to reticulate rugose sculpture in area between eye, frontal carina, and mandibular insertion; hypostomal margin with pair of widely-spaced, spiniform teeth, located near small recessed teeth flanking mandibles; scapes terete at base; setae on sides of face and vertex margin appressed, not projecting; pilosity on upper surface of hind femur appressed; mesosoma and gaster with abundant erect long flexuous setae.
Similar species: indagatrix. Pheidole JTL-135 has appressed pilosity on upper surface of hind femur; P. indagatrix has erect setae.
This species inhabits mid-elevation wet forest. During ALAS project sampling of the Barva transect it was found at the 1100m and 1500m sites. At the 1100m site it was most frequently captured in flight intercept traps, suggesting it is an epigaeic forager. At the 1500m site (Finca Murillo) a small queenrite nest was found beneath rotten wood; the workers had a foetid odor.
For a time I misidentified this species as variegata.
John T. Longino, The Evergreen State College, Olympia WA 98505 USA. email@example.com
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