Key to Monomorium queens of the New World

This key is based on: DuBois, M. B. 1986. A revision of the native New World species of the ant genus Monomorium (minimum group) (Hymenoptera: Formicidae). University of Kansas Science Bulletin. 53:65-119.

1

 * Head broadest at occiput; surface sculpturing greatly reduced; masticatory margin of mandible with fewer than 4 teeth . . . . . 11


 * Head broadest near compound eyes; at least some surface sculpturing near mandibular insertion; masticatory margin of mandible with 4 teeth . . . . . 2

2
return to couplet #1
 * Lateral profile of scutum and scutellum convex . . . . . 5


 * Lateral profile of scutum and scutellum flat or concave . . . . . 3

3
return to couplet #2
 * Scape with lateral fringe of erect setae; occurs in California, Nevada, and Utah . . . . . Monomorium wheelerorum


 * Scape lacking lateral fringe of erect setae . . . . . 4

4
return to couplet #3
 * Petiole emarginate; postpetiole not emarginate; head sculpturing reduced; occurs in Caribbean region . . . . . Monomorium ebeninum


 * Petiole not emarginate; postpetiole emarginate; head sculpturing as in; occurs in central Mexico . . . . . Monomorium compressum

5
return to couplet #2
 * Mesonotum with notal furrow . . . . . 6


 * Mesonotum lacking notal furrow . . . . . 7

6
return to couplet #5
 * Metanotum not projecting to level of propodeum and scutellum; petiole and postpetiole not emarginate; occurs in central and north-central Atlantic coastal states . . . . . Monomorium emarginatum


 * Metanotum projecting to level of propodeum and scutellum; petiole and postpetiole emarginate; occurs along coastal regions from New Jersey to Florida . . . . . Monomorium viridum