Strumigenys Fr. Smith

Strumigenys Fr. Smith, 1860. J. Entomol. 1: 72. Type-species: Strumigenys mandibularis Fr. Smith, 1860: 72, by monotypy.

Labidogenys Roger, 1862. Berl. Entomol. Zeit. 6: 249. Type-species: Labidogenys lyroessa Roger, 1862: 251, pl. 1. fig. 17, by monotypy. (Synonymy by Brown, 1959. Psyche 66: 38)

Pyramica Roger, 1862. Berl. Entomol. Zeit. 6: 251. Type-species: Pyramica gundlachi Roger, 1862: 253, pl. 1. fig. 18, by monotypy. (Synonymy by Brown, 1959. Psyche 66: 37)

Proscopomyrmex Patrizi, 1946. Boll. En- tomol. Univer. Bologna 15: 294. Type- species: Proscopomyrmex londianensis Patrizi, 1946: 295, fig 1, 2, by mono- typy. (Synonymy by Brown, 1949. Mushi 20: 15)

Eneria Donisthorpe, 1948. Ann. Mag. Nat. Hist. 14: 598. Type-species: Eneria excisa Donisthorpe, 1948: 598, fig. 1 (= Strumigenys loriae Emery), by original designation. (Synonymy by Brown, 1949. Mushi 20: 15)

All the Taiwanese species of the genus Strumigenys belong to the gode- ffroyi-group in Brown (1959). This spe- cies-group differs from other groups by the following combination of characters: no preocular notch in the ventrolateral margin of head: mandibles slender, sickle- or hook-like at apex, with a pair of spiniform preapical teeth or reduced; apical fork with 2, 3 or 4 spiniform teeth; presence of long projecting fine hairs on the dorsal (outer) surface of the hind tibia and basitarsus; spongiform ap- pendages on propodeum, petiole and post- petiole.

Key to the species of Strumigenys in Taiwan

1. Anterior clypeal margin deeply con- cave medially (Fig. 3) .......................... S. formosensis Forel

- Anterior clypeal margin transverse (Figs. 4-8).......................................2

2. Dorsolateral margin of head behind level of eye. with 1 or more laterally projecting flagellate hairs; simple hairs may be present........................3

- Dorsolateral margin of head behind level of eye without laterally proje- cting flagellate hairs; simple hairs may be present.......................................7

3. Head and mesosoma with flocculent hairs and lacunose sculpture (Fig. 5); head dorsolaterally with 3 pairs of long flagellate hairs (Fig. 20); man- dible with a pair of spiniform preap- ical teeth or reduced (Figs. 5, 20); apical fork with an intercalary den- ticle between spiniform teeth; propode- al teeth acute and well developed....... ........................... S. lacunosa sp. nov.

- Head with spatulate hairs (Figs. 4, 7, 8); head dorsolaterally with 2 pairs of long flagellate hairs at most; mandible with a pair of acute spiniform preap- ical teeth, apical fork with 1 or 2 intercalary denticle between spiniform teeth; propodeal teeth spongiform......4

4. First gastral tergite with 5 pairs of long flagellate hairs at most (Fig. 36); dorsolateral border of head posteriorly without erect hair (Fig. 35)..............5

- First gastral tergite with numerous, long flagellate hairs (Fig. 31); dorsolateral border of head posteriorly with 3 pairs of erect hairs at least (Fig. 30).........................................6

5. Medium species. TL 2.20-2.44 mm: mandible relatively long, MI>45. straight in full face view; propodeum smooth and shining in most part; eye with 6 ommatidia....... S. trada sp. nov.

- Smaller species. TL 1.70-1.96 mm; man- dible relatively short. MI<37, arcuate in full face view (Fig. 7); propodeum microreticulate; eye consisting of 9-1 ommatidia ...................................... ......... S. minutula Terayama & Kubota

6. Dorsum of promesonotum with numerous. short curved hairs (Fig. 13); siz relatively small, TL 2.20-2.22 mm; eye relatively large, consisting of 28-2ommatidia; in female, mesosoma in profile with scutum convex (Fig. 34)--- ...................... S. nanzanensis sp. nov.

- Dorsum of promesonotum with few short curved hairs (Fig. 10); size relatively medium. TL 2.36-2.44 mm; eye relatively small, consisting of 10-13 ommatidia; in female, mesosoma in profile with scutum even.................... ............................. S. godeffroyi Mayr

7. First gastral tergite with numerous simple erect hairs (Fig. 26)...............8

- First gastral tergite with long flagel- late hairs, without simple erect hairs (Fig. 16).........................................9

8. Cephalic dorsum with numerous long erect hairs (Fig. 6); dorsal margin of antennal scrobe with long erect hairs; dorsum of mesosoma with 8 pairs of long erect hairs at least (Fig. 12); larger species, TL 2,5-2.7 mm ..... S. liukueiensis Terayama & Kubota

- Cephalic dorsum with erect hairs only in posterolateral area (Fig, 25); dorsa. margin of antennal scrobe with short narrowly spatulate hairs: dorsum o; mesosoma with 6 pairs of long erect hairs at most: smaller species. TL 2.10 2.14 mm............. S. lichiaensis sp. nov.

9. Numerous, long flagellate hairs on first gastral tergite; with propodeal teeth acute; propodeal lamellae well developed; in female, mesosoma in profile with scutum convex ................ ............................ S. solifontis Brown

- Sparse, long flagellate hairs on first gastral tergite (Fig. 16); propodeal teeth spongiform; in female, mesosoma in profile with scutum even (Fig. 19) .. ............................. S. hispida sp. nov.