Key to Costa Rican Nomamyrmex

Ecitoninae, Myrmicinae, Formicidae, Hymenoptera, Insecta, Arthropoda, Animalia

John T. Longino
The Evergreen State College
Olympia WA 98505 USA
longinoj@evergreen.edu

7 August 1996

Contents of this key are from:

Watkins, J. F. II 1977. The species and subspecies of Nomamyrmex (Dorylinae: Formicidae). Journal of the Kansas Entomological Society 50:203-214.

Workers

1a. Back of head with deep transverse groove; top of petiole longitudinally wrinkled: (Nomamyrmex esenbeckii complex): 1.1

1b. Back of head with a transverse line but without a deep groove; top of petiole smooth: hartigii

1.1a. Hind margin of mesonotum somewhat emarginate; posterolateral vertex flange less pronounced: esenbeckii wilsoni

1.1b. Hind margin of mesonotum nearly straight; vertex flange more pronounced: esenbeckii crassicornis

Males

1a. Border of head behind ocellar peduncle without narrow lamella; first gastric tergite usually with longitudinal rugae; width of blade of stipes about one half its length; volsellae blunt, gradually tapered or snout-shaped: 1.1

1b. Border of head behind ocellar peduncle with a narrow lamella; first gastric tergite without longitudinal rugae; width of blade of stipes at least two thirds its length; posteroventral projection of volsella triangular with a small dorsal tooth near the sharp apex: hartigii

1.1a. Setae on fifth gastric tergite continuous across tergite, at least posteriorly; longitudinal rugae present on second gastric tergite: esenbeckii crassicornis

1.1b. Setae on fifth gastric tergite distinctly separated along the midline; longitudinal rugae on second gastric tergite indistinct or absent except in sulcus at anterior edge esenbeckii wilsoni

Page author: John T. Longino longinoj@evergreen.edu

Last modified: 08/07/1996