Crematogaster treubi subsp. apilis, Forel

Hosoishi, Shingo & Ogata, Kazuo, 2012, Revision of the Crematogaster brevis complex in Asia (Hymenoptera: Formicidae), Zootaxa 3349, pp. 18-30 : 20

Key to species based on the worker caste (except for C. treubi apilis Forel , which was not examined)

1 Clypeus with distinct rugulae. Petiole rectangular, with angular corners in dorsal view ( Fig. 3 a). Occipital carina developed as distinct ridge ( Fig. 2 a).................................................................................. 2

- Clypeus relatively smooth and shining without distinct rugulae. Petiole broader anteriorly than posteriroly, but without angular corners ( Fig. 3 b). Occipital carina undeveloped, without distinct ridge ( Fig. 2 b).................................... 3

2 Clypeus with one longitudinal rugula on the median portion and two distinct pairs of longitudinal rugulae laterally. Dorsal promesonotum with dense reticulate sculpture ( Fig. 4 a)................................................... brevis

- Clypeus with two distinct pairs of longitudinal rugulae, but lacking median rugula. Dorsal promesonotum with more open reticulate sculpture with shiny interspaces ( Fig. 4 b).................................................... overbecki

3 Propodeal spines undeveloped ( Fig. 12 )................................................................ yappi

- Propodeal spines developed ( Fig. 6 )....................................................................... 4

4 Postpetiole strongly bilobed behind ( Fig. 3 c)........................................................... walshi

- Postpetiole weakly bilobed ( Fig. 3 b)....................................................................... 5

5 Metanotal groove distinct and deep ( Fig. 5 a).......................................................... bouvardi

- Metanotal groove less distinct and deep ( Fig. 5 b)............................................................ 6

6 Propodeal spines short and stout, their length shorter than the diameter of propodeal spiracles ( Fig. 5 b)............. kojimai

- Propodeal spines long and slender, their length longer than the diameter of propodeal spiracles ( Fig. 5 c)............. treubi

Figures

FIGURE 5. Mesosoma in lateral view. 5 a, Crematogaster bouvardi; 5 b, C. kojimai; 5 c, C. treubi. Scale bars are all 0.5 mm.

FIGURES 1 – 3. 1. Full face view of head. 1 a, Crematogaster treubi; 1 b, C. (Orthocrema) longipilosa. Arrow indicates anterolateral margin of clypeus. Scale bars are all 0.5 mm. 2. Occipital carina in posterior view. 2 a, Crematogaster overbecki; 2 b, C. bouvardi. Arrow indicates occipital carina. Scale bars are all 0.5 mm. 3. Petiole and postpetiole in dorsal view. 3 a, Crematogaster brevis; 3 b, C. treubi; 3 c, C. walshi. Scale bars are all 0.5 mm.

FIGURES 6 – 12. Asian species of the Crematogater brevis complex in lateral view. Scale bars are all 0.5 mm. 6, Crematogaster bouvardi [Doi Suthep, Chiang Mai, North Thailand]; 7, C. brevis [Bogor, Java]; 8, C. kojimai [path 3, Cameron Highlands, Malay Peninsula]; 9, C. overbecki [Singapore]; 10, C. treubi [7 miles, Cameron Highlands, Malay Peninsula]; 11, C. walshi [Puri, Bengal]; 12, C. yappi [Gunung Inas, Kedah].