Crematogaster butteli Forel, 1913

Hosoishi, Shingo, 2015, Revision of the Crematogaster ranavalonae - group in Asia, with description of two new species (Hymenoptera, Formicidae), Journal of Hymenoptera Research 42, pp. 63-92 : 70-72

Crematogaster butteli Forel

Fig. 27

Crematogaster (Oxygyne) butteli Forel, 1913: 78. Type locality: Indonesia, Soengei Bamban, Sumatra. Combination in C. (Crematogaster) by Blaimer, 2012b: 55.

Type material examined.

Crematogaster (Oxygyne) butteli : lectotype worker (top specimen of two on one pin) by present designation and four paralectotype workers from Indonesia, Soengei Bamban, Sumatra (MHNG, examined); one syntype worker from Indonesia, Soengei Bamban, Sumatra (NHMB, examined).

Measurements and indices

(type workers, n = 5). HW 0.80-0.85; HL 0.76-0.80; CI 103-107; SL 0.64-0.67; SI 79-84; EL 0.16-0.17; PW 0.48-0.52; WL 0.91-0.96; PSL 0.12-0.14; PtL 0.21-0.22; PtW 0.22-0.24; PtH 0.15-0.16; PpL 0.14-0.15; PpW 0.24-0.25; PtHI 68-76; PtWI 95-114; PpWI 167-179; WI 100-119.

General description of worker.

Head appearing subquadratic in front view. Mandible weakly striate, with four teeth, apical and subapical teeth large, basal two teeth smaller. Scape exceeding posterior corner of head, with appressed setae, each of which is as long as width of scape. Compound eye large and slightly projecting beyond lateral margin of head in full face view.

Ventrolateral katepisternal ridge indistinct posteriorly. Propodeal spine long and stout, longer than spiracle diameter, directed upward, dorsum higher than anterior propodeum in lateral view. Propodeal spiracle large, situated on lateral surface of propodeum and close to propodeal declivity in lateral view.

In dorsal view, shape of petiole scoop with tapering side posteriorly, longer than broad. Petiole with anterolateral corner angulate. Petiolar spiracle big, as wide as half of propodeal spiracle in size. Postpetiole bilobed but without longitudinal median sulcus. Postpetiole as wide as petiole in dorsal view.

Integument essentially smooth and shiny. Clypeus smooth and shiny without rugulae. Malar region generally smooth, with feeble rugulae. Dorsal surface of promesonotum smooth and shiny. Lateral surface of pronotum smooth and shiny. Mesopleuron shiny, but with longitudinal rugulae. Dorsal surface of propodeum smooth and shiny. Lateral propodeum shiny, but with longitudinal rugulae.

Erect pilosity almost absent. Dorsum of head, clypeus and mesosoma with sparse, short and appressed setae. Clypeus with one pair of longer setae on anteriormost portion, directed medially. Anterior clypeal margin with two pairs of longer setae on median portion, mixed with some shorter setae on sides. No erect setae on pronotal shoulder. Posterolateral tubercle with some appressed setae. Ventral surface of petiole with appressed setae. Postpetiole with one pair of longer erect setae posteriorly. Fourth abdominal tergite with appressed setae.

Body color reddish brown.

Distribution.

This species is known only from the type locality in Sumatra.

Comments.

This species is similar to C. tumidula but can be distiguished in having angulate anterolateral corners of the petiole.

Figures

Figure 27. Crematogaster butteli [Soengei, Bamban, Sumatra, Indonesia]. A Lateral view of body B Full face view C Dorsal view of petiole and postpetiole.