Key to Monomorium males 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.

The following species are not included in this key: Monomorium compressum, Monomorium emarginatum, Monomorium inquilinum, Monomorium marjoriae, Monomorium pergandei, and Monomorium wheelerorum.

1

 * Eighth sternite emargination lacking projecting setae . . . . . 2


 * Eighth sternite emargination with projecting setae; common along Atlantic coast from New Jersey to Florida . . . . . Monomorium viridum

2
return to couplet #1
 * Aedeagus with toothed margin straight . . . . . 3


 * Aedeagus with toothed margin curved . . . . . 4

3
return to couplet #2
 * Cuspis of volsella present; known only from type locality (Livingston Co., Michigan) . . . . . Monomorium talbotae


 * Cuspis of volsella absent; occurs throughout C aribbean region . . . . . Monomorium ebeninum

4
return to couplet #2
 * Cuspis of volsella with 3 setae . . . . . 5


 * Cuspis of volsella with 5 setae; occurs throughout central Mexico, Arizona, New Mexico, and parts of Texas . . . . . Monomorium cyaneum

5
return to couplet #4
 * Aedeagus quadrate; occurs throughout central U.S. . . . . . Monomorium minimum


 * Aedeagus longer than broad . . . . . 6

6
return to couplet #5
 * Eighth sternite emargination 1/2 as deep as wide; occurs along California coast . . . . . Monomorium ergatogyna


 * Eighth sternite emargination as deep as wide; occurs in northern Florida . . . . . . . . . Monomorium trageri