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Etymology Referring to the type locality, San Antonio, an "arhuaque" (Arawak) village.
Diagnosis A medium-sized, yellow species with conulate humerus in both major and minor, when seen in dorsal-oblique view. Close to caulicolaHNS of Costa Rica but with less prominent humeri, longer antennal scapes, and broader, more angulate postpetiolar node in both castes, as well as completely foveolate central pronotal dorsum in the major. Also similar but less so to chalcaHNS, chalcoidesHNS, mincanaHNS, schmalziHNS, and tragicaHNS.
Measurements (mm) Syntype major (Mus. Comp. Zool. Harvard): HW 0.80, HL 0.86, SL 0.40, EL 0.10, PW 0.44. Syntype minor (Mus. Comp. Zool. Harvard): HW 0.46, HL 0.50, SL 0.44, EL 0.06, PW 0.30. color Major and minor: concolorous yellow.
Biology Forel found the type colony under a dried pat of cow dung.
Figure Upper: syntype, major. Lower: syntype, minor. COLOMBIA: San Antonio, Sierra Nevada de Santa Marta (Auguste Forel). Scale bars = 1 mm.
Found most commonly in these habitats: 2 times found in Second growth vegetation near primary forest.
Found most commonly in these microhabitats: 2 times in dead stick, 2 times D tige, 1 times D' tiges, 1 times D' tige.
Elevations: collected at 100 m
Collect Date Range: collected on 1985-08-30
Type specimens: paratype of Pheidole arhuaca: casent0916948; syntype of Pheidole arhuaca: casent0904416, casent0904417, casent0908252, casent0908253, casent0922216; syntype of Pheidole arhuaca bimons: casent0908254, casent0908255
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