Strumigenys trinidadensis group

Strumigenys trinidadensis group Bolton (2000)

Neotropical-Nearctic

 * Strumigenys trinidadensis
 * Strumigenys vivax

Worker Diagnosis
Apical fork of mandible with one intercalary tooth. Mandible with a single inconspicuous preapical denticle or two small preapical teeth; preapical dentition not crowded near apex. MI 65-71.

Anterior clypeal margin extremely shallowly convex to extremely shallowly concave.

Leading edge of scape with 1-2 hairs in the basal third that are curved toward the base of the scape. Scape slender and with a shallow subbasal curve; SI 85-94.

Upper scrobe margin not sharply defined behind level of eye.

Ventrolateral margin of head weakly concave or constricted in front of eye. Postbuccal groove small and shallow.

Propodeum a with tooth or spine at apex of declivity and with a tooth-like or acutely triangular lower lobe at base of declivity, the two linked by a carina or narrow lamella.

Ventral surface of petiole with spongiform tissue though it may be reduced to a shallow crest or only extend part of the length of the segment.

Pilosity. Flagellate hairs present: in apicoscrobal position; at pronotal humeri; on mesonotum (one pair); numerous on waist segments; abundant and more or less erect on first gastral tergite. Ground-pilosity of head and alitrunk of curved spatulate hairs.

Sculpture. Head, alitrunk and waist segments predominantly reticulate-punctate, may be superimposed fine rugulae; without a smooth polished area on mesopleuron. First gastral tergite blanketed with fine dense longitudinal costulate-striolate sculpture. A small group containing only two species. They are characterised together by their combination of presence of hairs on the leading edge of the scape that are curved toward the base of the scape, single intercalary tooth, form of propodeal armament and completely sculptured first gastral tergite that is abundantly clothed with fine flagellate hairs.