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TABLES FOR THE DETERMINATION OF THE SUB-GENERA
OF THE WORKERS AND THE SOLDIERS

OLD CONTINENTS AND AUSTRALIA (2)

1. a. Mandible with teeth partly geminate (each having two denticles) at the apex of masticatory margin, teeth also present at the basal margin. Clypeus carinate, extending anteriorly as projecting lobe, indented in the middle and armed along each side of its anterior margin with a horn-like angle . Giant Malayan species ... 1. Subgenus DYNOMYRMEX, Ashmead.
1. b. Mandibles with simple teeth, generally teeth absent at the basal edge.. [2]

2. a. Psammophore strongly developed, consisting of a transverse row of hairs on the clypeus behind its margin (mustache), a line of hairs at the dorsal margin and on the underside of the mandibles, a tuft of hairs under chin. Species of Africa... 3. Subgenus MYRMOPSAMMA, Forel.
2. b. Psammophore absent... [3]

3. a. Apical tooth of the mandibles very long, with very oblique masticatory margin. Major worker unknown (does it exist?). Minor worker with head narrowed as collar behind. Large species of Africa. The female has the mandibles similar to the worker... 2. Subgenus MYRMOXYGENYS, Emery.

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3. b. Not having these characters. Apical tooth of the mandibles much shorter ...[4]

4. a. Antennas inserted at about at the level of the middle, or a little behind the middle of the length of the frons ...[5]
4. b. Antennas inserted in front of half of the frons...[7].

5. a. Head depressed in its anterior half, also at the large workers. Funiculus with remarkably short segments... 21. Subgenus MYRMOPLATYS, Forel.
5. b. Head not depressed. Extreme dimorphism present (i.e., no media workers). In the soldiers and the females, the head is more or less cylindrical and obliquely truncated anteriorly, so that in general the surface of truncation includes only one part the clypeus... [6]

6. a. Dorsum of mesosoma (mesosoma) continuous or interrupted by impressions or notches. Propodeal angles not compressed into a lamina (unarmed), rarely, armed posteriorly with a pair of teeth... 25. Subgenus COLOBOPSIS, Mayr.
6. b. Mesonotum high, compressed. Propodeum rises dorsally into a lamina (narrow ridge), often elaborated posteriorly as a single tooth... 24. Subgenus MYRMOGONIA, Forel.

7. a. Mesosoma narrow, constricted in the middle which represents the mesonotum fused with the metanotum, both of which are very elongated. The propodeum is in the shape of rounded bump. Species of Madagascar... 10. Subgenus MYRMOPYTIA, Emery.
7. b. Mesosoma not or little constricted... [8].

8. a. Dimorphism absent. Head rounded and broader posteriorly. Mesosoma not marginate, deeply impressed in front of the propodeum. Clypeus very short, not forming lobe and sometimes with a notch in the middle. Species of the Indian islands... 11. Subgenus KARAVAJEVIA, Emery.
8. b. Dimorphism is more or less marked (in a group of Madagascar species, the dorsum of mesosoma is marginate, though the dimorphism is poorly expressed)... [9].

9. a. Tibiae compressed and covered with erect hairs (scapes also). Undersurface of the anterior tarsi furnished with thick brushes. Large and medium species of Malaysia... 20. Subgenus MYRMOTARSUS, Forel.
9. b. Other characters... [10].

10. a. Generally with massive body. Head of the minor workers usually short, broader behind than in front, its posterior margin right or slightly convex, the eyes places posteriorly. Head of the major workers usually broad, much narrower in front. Mesosoma generally short, the disc of the pronotum often submarginated or marginated or even with shoulders (with weak pronotal angles). In some groups a more or less big impression separates the thoracic segments from the propodeum which is then usually marginate or a weakly bidentate. Species of Africa, Madagascar and India... [11].
10. b. Other characters. In some species of Australia, the small workers have the head as descrived above... [15].

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11. a. Petiole low, having the form of a rounded node, coarsely punctate. Mesosoma more or less impressed in front of the propodeum. Propodeum usually marginate and sometimes bidentate. Pronotum seldom forms shoulders and bidentate... 15. Subgenus ORTHONOTOMYRMEX, Ashmead.
11. b. Thin or thick petiole. Never nodiform... [12].

12. a. Anterior part of the head of the major workers foveate, the interior of the foveae punctate... [13].
12. b. Head of the large workers not foveate… [14].

13. a. Pronotum depressed and marginate. Propodeum marginate... 19. Subgenus MYRMISOLEPIS, Santschi.
13. b. Propodeum not marginate... 18. Subgenus MYRMOTREMA, Forel.

14. a. Petiole more or less thick, sometimes very broad and massive. Mesosoma generally impressed in front of the propodeum, which is marginate or even sometimes bidentate. other times the very short propodeum steeply sloped (C. echinoploides) (pi. 3, 6) black color. tegument dull (matte)... 16. Subgenus MYRMEPINOTUS, Santschi.
14. b. Petiole generally thin, having more or less sharp edges. Dorsum of mesosoma continuous or impressed. Propodeum seldom marginate. Tegument mat (?), punctuated. often with coarse setae, fawn-coloured, jannes (?) or white, scattered or serres (?), or a pubescence doree (?) formant fur-lined coat, decorating it in a characteristic way... 17. Subgenus MYRMOPIROMIS, Wheeler.

15. a. Head of the large workers massive, concave posteriorly, narrowed anteriorly. Head with of small, round posterior and forming a more or less distinct collar which is articulated with the mesosoma. Clypeus usually with a round anterior lobe. Mesosoma narrow behind, not at all (Aucun is a confusing word to translate that can mean any, either, neither or none.) marginated, more or less depressed into a “saddle” or impressed with the joining mesoepinotum (P1. 2, 15). Species of Indo-Malaysia, Australia and Madagascar... 9. Subgenus MYRMOSAULUS, Wheeler.
15. b. Other characters [16].

16. a. Median part the clypeus of major workers (which lies between the two antennal sockets) reduced in width compared to that of the minor workers, and compared to the cheeks, which often become prominent. The carina of the clypeus and the anterior lobe, which can exist in minor workers, are generally absent in major workers. The dimorphism of the workers is sometimes extreme... [17].  
16. b. Clypeus variable in its form and proportions compared to the dimensions of head in the minor and major workers, except usually the size and the shape of the anterior lobe (generally present)... [18].

17. a. Head of the major workers generally longer than broad. At a great number of species, it is differently sculptured and more or less distinctly truncate or blunt before, has parallel sides (facies of Colobopsis). Clypeus

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usually without lobe, or projecting in an arc, or rarely with a narrow lobe (some species of Africa: C. emarginatus, C. nasutus). Species of the Old Continent and Australia... 20. Subgenus MYRMAMBLYS, Forel.
17. b. Head of the large workers broad, truncate nor blunt anteriorly. Clypeus without lobe, depressed or narrowly incised at the middle of anterior margin. Mesosoma has back arching or impressed in front of the propodeum. Holarctic species or Asian... 12. Subgenus MYRMENTOMA, Forel.
17. c. Head of the large workers very generally broad and vaulted (convex dorsal surface). Clypeus arched or with lobes on the anterior margin in minor workers. At the large ones, the lobe is reduced and indented in the middle, so that the anterior margin is more or less distinctly bidentate.. 8. Subgenus MYRMOPHYMA, Forel.

18. a. Dorsum of mesosoma more or less submarginate and interrupted by impressions with sutures. Weak dimorphism present. Species of Madagascar... 14. Subgenus MYRMONESITES, Emery.
18. b. The dorsum of mesosoma not marginate, except the disc of the pronotum, which is seldom submarginated anteriorly... [19].

19. a. Common species of Madagascar or Africa, shining, has head generally broad in the large workers. In major workers, the clypeus usually has a short lobe, truncated anteriorly, which is absent or rounded in minor workers. In profile view the mesosoma variously formed, continuous or arched, or with the propodeum forming a saddle, or lower than the mesonotum... 15. Subgenus MAYRIA, Forel.
19. b. Species of Africa, Mediterrania or India. Clypeus lobed. Dimorphism often very marked. Head of the small workers sometimes very narrow (pi. 3, 3), that of major workers rounded. Body matte, finely sculptured and covered with pubescence (especially the gaster)... 6. Subgenus MYRMOSERICUS, Forel.
19. c. Other characters... [20].

20. a. Dimorphism more or less present. Head of major workers generally much broader behind than in front. Head of the minor workers of various forms. In some groups, it narrows into a cone or other form posteriorly, so that it does not have any more a posterior margin (?) (pi. 3, I, lb, lc, 2). Clypeus distinctly lobed... 5. Subgenus TANAEMYRMEX, Ashmead.
20. b. Head of the large workers a little broader behind than in front, that of minors has occipital margin more or less rounded (never cone-shaped). Clypeus usually without lobe or with a short lobe... 4. Subgenus CAMPONOTUS, Mayr.