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

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

Allomerus dentatus

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

Allomerus

4

return to couplet #1

• Antennae 11 segmented; pronotal suture feebly impressed dorsally; propodeum sharply angulate in lateral view . . . . . Allomerus undecemarticulatus

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

Allomerus

7

return to couplet #5

• Antennae 7 (rarely 6) segmented . . . . . Allomerus septemarticulatus

Allomerus

• Antennae 8 (rarely 9) segmented . . . . . Allomerus octoarticulatus (or A. octoarticulatus species complex)

Allomerus