Key to Colobostruma of the southwestern Australian Botanical Province

This worker key is based on: [[Media:Heterick 2009.pdf|Heterick, B. E. 2009a. A guide to the ants of South-western Australia. Records of the Western Australian Museum, Supplement 76: 1-206. Part 2 PDF]]

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 * Australia
 * SWBP
 * Colobostruma

1

 * In lateral view, mesosoma strongly arched, propodeum low in relation to petiole and postpetiole (Figure 535) . . . . . Colobostruma nancyae


 * In lateral view, mesosoma at most weakly convex . . . . . 2

2
return to couplet #1
 * Lamellae absent from lateral face of postpetiole, expanded posteriad only (pale, depigmented species) (Figure 536) . . . . . Colobostruma cerornata


 * Lamellae present on both lateral and posterior faces of postpetiole, expanded to form wing-like flanges (Figure 537) . . . . . 3

3
return to couplet #2
 * Wing-like flange of postpetiole with translucent windows along both anterior and posterior margins, its anterior margin formed by band of thickened integument (Figure 538) . . . . . Colobostruma mellea


 * Wing-like flange of postpetiole with a translucent window on its posterior margin only, its anterior margin formed by band of thickened integument (Figure 539) . . . . . 4

4
return to couplet #3
 * Antennae 4 or 5-segmented . . . . . Colobostruma elliotti


 * Antennae with 6 or more segments . . . . . 5

5
return to couplet #4
 * Antennae gently elbowed, lacking ventral lobe, antennal diameter changing gradually along its length . . . . . Colobostruma australis


 * Antennae strongly elbowed, with ventral lobe, greatest diameter of antenna being across lobe . . . . . 6

6
return to couplet #5
 * In full-face view, ridges immediately in front of eyes nearly parallel or diverging posteriad (Figure 540) . . . . . Colobostruma papulata


 * In full-face view, ridges immediately in front of eyes converging posteriad (Figure 541) . . . . . Colobostruma froggatti