Pheidole bruesi Wheeler

Wilson, E. O., 2003, Pheidole in the New World. A dominant, hyperdiverse ant genus., Cambridge, MA, USA: Harvard University Press, pp. -1--1: 174

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Pheidole bruesi Wheeler

new status

Pheidole bruesi Wheeler  HNS  , new status

Pheidole triconstricta var. bruesi Wheeler  HNS  191 lb: 169.

Types Mus. Comp. Zool. Harvard.

Etymology Named after the collector, the entomologist Charles T. Brues.

Diagnosis A small, yellow, nearly hairless member of the diligens  HNS  group, similar to diligens  HNS  , inversa  , laidlowi  , radoszkowskii  , and triconstricta  HNS  , and differing by the following combination of traits.

Major: cephalic sculpturing consisting exclusively of longitudinal carinulae and foveolae, which are usually confined to the dorsal surface anterior to the posterior margin of the eyes; promesonotal profile 3-lobed; petiolar node thick; lateral margins of postpetiolar node subangular; gaster entirely smooth and shiny.

Minor: promesonotal profile 3-lobed. The Grenada series collected by Stefan Cover and me are variable, especially in the amount of cephalic sculpturing. A series nearly identical to the Grenadan population was collected by William L. Brown between Manaus and Itacoatiara, Amazonas, Brazil; it differs from the Grenada bruesi  HNS  types only in the convex occiput (frontal view) and convex petiolar dorsal border (rear view) of the minor. Thus the status of bruesi  HNS  as a Grenadan or even West Indian endemic is in doubt. Measurements (mm) Lectotype major: HW 0.98, HL 1.00, SL 0.72, EL 0.20, PW 0.46. Paralectotype minor: HW 0.52, HL 0.60, SL 0.66, EL 0.12, PW 0.34. color Major and minor: yellow.

Range Known only from Grenada and, probably, Amazonian Brazil (see Diagnosis).

Biology At La Sagesse Bay, Stefan Cover and I found P. bruesi  HNS  abundant in dry, semi-deciduous scrub woodland, nesting in soil covered by thin leaf litter. At Fort Jeudy, a nest was found in dry deciduous forest, in a small rotting stump with galleries extending downward into the soil. In a nutmeg grove at Concord Falls, we found nests common in the soil. A nest excavated at Sagesse Bay contained a single queen. Majors and minors were readily attracted to baits, following odor trails laid by individually foraging scout workers. A male was collected in a nest on Grenada by C. T. Brues in September.

Figure Upper: lectotype, major. Lower: paralectotype, minor. GRENADA, WEST INDIES: Grand Etang (Charles T. Brues). Scale bars = 1 mm.