To cite this page, please use the following:
· For print: . Accessed
· For web:
Pheidole piceonigra EmeryHNS
Types Naturhist. Mus. Wien (unde rpicea Mayr).
Etymology L piceonigraHNS, pitch-black plus black.
Diagnosis Close to indistinctaHNS of Costa Rica, considered by Longino (1997) to belong with it in a single, very variable species. The types, however, are very different, with those of piceonigraHNS distinguished as follows.
Major: piceonigraHNS with much less abundant pilosity than indistinctaHNS; rugoreticulation between eye and antennal fossa; color much darker (see Color below), and head concolorous, not bicolorous as in indistinctaHNS; posterior side of head with bands of foveolae; humerus in dorsal-oblique view rounded; apex of postpetiole in side view more rounded.
If continuous intergrades are demonstrated between the two forms, they may be joined; otherwise it is more prudent to distinguish them as species.
Measurements (mm) Lectotype major: HW 1.06, HL 1.04, SL 0.76, EL 0.20, PW 0.54. Paralectotype minor: HW 0.62, HL 0.70, SL 0.80, EL 0.14, PW 0.40. Color Major: body dark brown, gaster almost black.
Minor: head, mesosoma, and waist dark reddish brown; propodeum and gaster blackish brown; appendages medium brown.
Range I have seen series from Chiapas, Tamaulipas, and Veracruz in Mexico, at 1070-2200 m, and from Costa Rica. On the basis of the types, I am considering this species as different from indistinctaHNS, which also occurs in Costa Rica.
Biology Longino's notes (1997) on the distribution and natural history of " indistinctaHNS " may apply to that species, to piceonigraHNS, or to both. I found a large, undoubted piceonigraHNS colony nesting at the base of an ornamental shrub in a much disturbed San Jose city park. In Tamaulipas, the Cornell University Mexico Field Party of 1965 encountered it at 1070 m in tall cloud forest.
Figure Upper: lectotype, major. Lower: paralectotype, minor. MEXICO (no further data). Scale bars = 1 mm.