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Types Mus. Comp. Zool. Harvard.
Diagnosis A member of the " piliferaHNS complex" of the larger piliferaHNS group; for a characterization of the complex, see under piliferaHNS. P. cavigenisHNS is distinguished within the complex by the following combination of traits.
Major: occiput and extensive dorsal surface anterior to the occiput rugoreticulate; a small patch of rugoreticulum is present just posterior to each antennal fossa; humerus very prominent and lobose in dorsal-oblique view; mesonotal convexity absent, but mesonotum descends abruptly to the metanotal groove; propodeal spines long and thin; postpetiole spinose. Minor: almost all of dorsal head surface longitudinally carinulate; propodeal spine needle-shaped. Measurements (mm) Major (Montezuma Pass, Arizona): HW 1.60, HL 1.86, SL 0.74, EL 0.22, PW 0.76. Minor: HW 0.62, HL 0.66, SL 0.62, EL 0.12, PW 0.40.
Color Major: body light reddish brown, mandibles and gaster plain medium brown. Minor: head and gaster medium brown, mesosoma and appendages light brown.
Range Known from several collections in the Huachuca Mts; thence west to Sycamore Canyon in the Pajarito Mts., about 20 miles west of Nogales (Stefan Cover). A series in the Museum of Comparative Zoology from Bocoyna, Chihuahua, belongs to this species but with some differences; it may represent a geographical variant.
biology According to Stefan Cover, who has collected intensively within the range of cavigenisHNS, this species occurs in grassy gaps in juniper-oak-pinyon woodlands at mid-elevations. Nests are cryptic and seeds are sometimes found inside. Colonies appear to consist of no more than 200-300 individuals.
Figure Upper: major. Lower: minor. ARIZONA: 11 km west-northwest of Montezuma Pass, Huachuca Mts., Cochise Co., 1660 m (Stefan Cover). Scale bars = 1 mm.
Found most commonly in these habitats: 1 times found in oak woodland.
Found most commonly in these microhabitats: 1 times nest under rock.
Elevations: collected from 1219 - 1676 meters, 1371 meters average