Key to Allomerus species

Key based on Fernández (2007)

1

 * Propodeum in side view with teeth, spines or tuberculae .....2
 * Propodeum in side view convex to angulate, never dentate .....4

2
return to couplet #1
 * Propodeal spiracle high, dorsal margin at same level or sligthy above propodeal dorsum; hairs on head and promesonotum longer, about 0.2 mm in length; anterior clypeal setae long, especially medial seta . . . . . Allomerus maietae


 * Propodeal spiracle lower, dorsal margin distinctly below level of propodeal dorsum; hairs on head and promesonotum shorter, less than 0.15 mm in length; anterior clypeal setae shorter .....3

3
return to couplet #2
 * Propodeal spiracle close to base of propodeal bulla; antennae apparently 11 segmented . . . . . Allomerus dentatus


 * Propodeal spiracle distant from propodeal bulla; antennae 10 - 11 segmented . . . . . Allomerus vogeli

4
return to couplet #1
 * Antennae 11 segmented; pronotal suture feebly impressed dorsally; propodeum sharply angulate in lateral view . . . . . Allomerus undecemarticulatus


 * Antennae 10 segmented or fewer; pronotal suture absent dorsally; propodeum rounded or feebly angulate .....5

5
return to couplet #4
 * Antennae 10 segmented .....6
 * Antennae 9 segmented or less .....7

6
return to couplet #5
 * Clypeus with several short, longitudinal rugulae; body pilosity short, longer hairs about 0.07 mm; anterior clypeal setae very short, central seta inconspicuous . . . . . Allomerus brevipilosus
 * Clypeus smooth and shining; body pilosity longer, longest hairs about 0.12 mm; anterior clypeal setae longer, central seta conspicuous . . . . . Allomerus decemarticulatus

7
return to couplet #5
 * Antennae 7 (rarely 6) segmented . . . . . Allomerus septemarticulatus
 * Antennae 8 (rarely 9) segmented . . . . . Allomerus octoarticulatus (or A. octoarticulatus species complex)