Crematogaster bakeri

Hosoishi, Shingo & Ogata, Kazuo, 2009, A taxonomic revision of the Asian endemic subgenus Physocrema of the genus Crematogaster (Hymenoptera: Formicidae), Zootaxa 2062, pp. 15-36 : 19

Key to species based on the worker caste (except for C. bakeri , which is incertae sedis.)

1 Propodeal spines developed and with pointed apices................................................................................................... 2

- Propodeal spines undeveloped and forming obtuse lobes ............................................................................................ 4

2 Antennal club 3-jointed. Pronotum raised steeply toward mesonotum in lateral view ................................ mucronata

- Antennal club 4-jointed. Pronotum raised moderately toward mesonotum in lateral view ......................................... 3

3 In lateral view, pronotum and mesonotum forming a single convexity, propodeum distinctly raised relative to prome- sonotum, metanotal groove deep ......................................................................................................................... vacca

- In lateral view, pronotum and mesonotum forming a single convexity, propodeum slightly raised relative to prome- sonotum, metanotal groove less deep .................................................................................................. yamanei sp. nov.

4 Dorsal median portion of head swollen ................................................................................................ tanakai sp. nov.

- Dorsal median portion of head not swollen .................................................................................................................. 5

5 Propodeal spiracle situated near the metapleural gland orifice, the distance between them about the same as the propodeal spiracle diameter ( Fig. 4) ............................................................................................................................. 6

- Propodeal spiracle situated away from the metapleural gland orifice, the distance between them much greater than the propodeal spiracle diameter ( Fig. 3) ....................................................................................................................... 9

6 Clypeus smooth and shining without longitudinal rugulae ( Fig. 1 ) ..................................................................... inflata

- Clypeus striated with rugulae ( Fig. 2 ) .......................................................................................................................... 7

7 Dorsal face of head strongly striated with abundant longitudinal rugulae. Scape not reaching posterior corner of head in large workers. Workers with pronounced size polymorphism .......................................................................... aurita

- Dorsal face of head not strongly striated with longitudinal rugulae. Scape reaching posterior corner of head. Workers monomorphic in size..................................................................................................................................................... 8

8 The posterior portion of pronotum with transverse rugulae in dorsal view ( Fig. 6) .................................. physothorax

- The posterior portion of pronotum without distinct rugulae in dorsal view ( Fig. 7) .......................................... onusta

9 Dorsal setae on posterior portion of fourth abdominal tergite directed medially ( Fig. 8 ) ................................ difformis

- Dorsal setae on fourth abdominal tergite directed posteriorly ( Fig. 9 )....................................................................... 10

10 In lateral view, dorsal profile of promesonotum convex, propodeum distinctly raised relative to promesonotum, metanotal groove very deep ................................................................................................................................ sewardi

- In lateral view, dorsal profile of promesonotum convex, propodeum slightly raised relative to promesonotum, metanotal groove not so deep in dorsal median portion ................................................................................ ampullaris

Figures

FIGURES 1 − 2. Clypeus in dorsal view: 1 — C. (P.) inflata; 2 — C. (P.) aurita. White arrow indicates anterolateral margin of clypeus.

FIGURES 8 − 9. Setae on the fourth abdominal tergite: 8 — C. (P.) difformis; 9 — C. (P.) sewardi.