Myrmosinae, Fox, 1894

Key to the extant Old-World genera of Myrmosinae

Males (unknown in Nothomyrmosa )

............................................................................ Kudakrumia Krombein, 1979

- Hypopygium (S8) with lateral lobes or processes. Metasomal terga basally constricted. (Tribe Myrmosini ).............. 2

2. T7 laterally without preapical tooth....................................................................... 3

- T7 laterally with preapical tooth.......................................................................... 6

3. T7 without longitudinal rounded fovea and rounded apically. Inner border of mandible with two preapical teeth, subbasal tooth from base not widened. Metasomal sternum 2 basally without median tubercle. Eight Palaearctic species, unknown in Oriental Region....................................................................... Paramyrmosa Saussure, 1880

- T7 with longitudinal rounded fovea and more or less emarginated apically. Inner border of mandible with three preapical teeth, subbasal tooth widened. Metasomal sternum 2 basally with median tubercle....................................... 4

4. Legs black. Metasomal terga black with rare black setae on posterior border....................................... 5

- Legs except coxae red. T1–4 with ivory cuticular band and fringe of dense pale setae on posterior border. One Palaearctic species C. gussakovskiji Lelej from Tajikistan........................................... Carinomyrmosa Lelej, 1981

5. S1 with two large deep pits. Three Palaearctic species and one Oriental species T. cara Lelej from China: Taiwan.......................................................................................... Taimyrmosa Lelej, 2005

- S1 without two large deep pits. Two Palaearctic species, unknown in Oriental Region............ Myrmosa Latreille, 1797

6. Hypopygium (S8) with process between lateral process and medial lobe. Mesosoma usually partly rufous............................................................................................... Krombeinella Pate, 1947

- Hypopygium (S8) without process between lateral process and medial lobe. Mesosoma black. One Palaeaerctic and one Oriental species E. burmanensis Lelej from Myanmar......................................... Erimyrmosa Lelej, 1984

Females (unknown in Erimyrmosa )

1. Ocelli lacking. Clypeus basally without any medial tubercle or carina. (Tribe Kudakrumiini ).......................... 2

- Ocelli developed. Clypeus basally with medial tubercle or longitudinal carina. (Tribe Myrmosini )..................... 3

2. Distance between posterior eye margin and posterior vertex margin equal to longitudinal eye diameter; eye microsetae very short scarcely visible under high magnification. One Oriental species K. mirabilis Krombein from Sri Lanka, India: Kerala.............................................................................. Kudakrumia Krombein, 1979

- Distance between posterior eye margin and posterior vertex margin more than two times shorter than longitudinal eye diameter; eye microsetae long, easily visible. One Oriental species N. microsoma (Brothers) from India: Orissa.............................................................................................. Nothomyrmosa Krombein, 1979

3. S1 with two large deep pits........................................................... Taimyrmosa Lelej, 2005

- S1 without two large deep pits........................................................................... 4

4. T1 with longitudinal lateral carina. Pronotum elongated. One Palaearctic species C. gussakovskiji Lelej from Tajikistan.................................................................................. Carinomyrmosa Lelej, 1981

- T1 without longitudinal lateral carina. Pronotum not elongated................................................. 5

5. F3 angulate anteriorly.......................................................... Paramyrmosa Saussure, 1880

- F3 cylindrical........................................................................................ 6

6. Head behind eyes not elongated, with convergent sides. F1 equal to F2 or shorter than it. T1 with brownish-red cuticular band................................................................................ Myrmosa Latreille, 1797

- Head behind the eyes elongated with more or less parallel sides. F1 slightly longer than F2. T1 usually with ivory cuticular band............................................................................ Krombeinella Pate, 1947