Strumigenys strygax

This species has been collected from litter samples in rainforest and rubber plantations.

Identification
Bolton (2000) – A member of the koningsbergeri complex in the Strumigenys koningsbergeri-group. See Strumigenys koningsbergeri.

Distribution based on Regional Taxon Lists
Indo-Australian Region: Borneo, Indonesia, Malaysia. Oriental Region: Thailand. Palaearctic Region: China.

Nomenclature

 *  strygax. Strumigenys strygax Bolton, 2000: 853 (w.) THAILAND.

Worker
Holotype. TL 2.5, HL 0.74, HW 0.66, CI 89, ML 0.31, MI 42, SL 0.36, SI 55, PW 0.33, AL 0.68. With characters of koningsbergeri-complex. Preocular concavity forms a shallow depression on ventral surface of head. Upper scrobe margins not constricted above eye, only extreme outer arc of eye visible in full-face view, or eye not visible. Depression across posterior vertex of head shallow, weakly developed. Pronotum without a pair of short standing hairs close to anterodorsal margin. Pronotal humeral hair stiff, straight and simple. A single erect pair of hairs on mesonotum. Katepisternum, metapleuron and side of propodeum smooth except for weak reticulate or reticulate-punctate sculpture around the periphery. Bullae of femoral glands absent on middle and hind legs. Lamella on propodeum conspicuous. Standing hairs on first gastral tergite weakly spatulate or slightly expanded and flattened toward the apex.

Paratypes. TL 2.1-2.5, HL 0.64-0.74, HW 0.54-0.65, CI 84-89, ML 0.26-0.31, MI 38-42, SL 0.30-0.38, SI 53-58, PW 0.25-0.32, AL 0.56-0.65 (5 measured).

Dimensions in non-paratypic workers. HL 0.64-0.75, HW 0.54-0.65, CI 84-88, ML 0.26-0.30, MI 38-43, SL 0.32-0.37, SI 56-60 (10 measured).

Type Material
Holotype worker, Thailand: Chiang Mai, Chang Khian, 16.xi.1984 (D. Jackson).

Paratypes. 5 workers with same data as holotype (BMNH,, ).

Determination Clarifications
This species was referred to as Strumigenys sp. 6 in Bolton, 1998b: 92.

References based on Global Ant Biodiversity Informatics

 * Alcantara M. J., S. Modi, T. C. Ling, J. Monkai, H. Xu, S. Huang, and A. Nakamura. 2019. Differences in geographic distribution of ant species (Hymenoptera: Formicidae) between forests and rubber plantations: a case study in Xishuangbanna, China, and a global meta-analysis. Myrmecological News 29: 135-145.
 * Bolton, B. 2000. The Ant Tribe Dacetini. Memoirs of the American Entomological Institute 65
 * Fontanilla A. M., A. Nakamura, Z. Xu, M. Cao, R. L. Kitching, Y. Tang, and C. J. Burwell. 2019. Taxonomic and functional ant diversity along tropical, subtropical, and subalpine elevational transects in southwest China. Insects 10, 128; doi:10.3390/insects10050128
 * Guénard B., and R. R. Dunn. 2012. A checklist of the ants of China. Zootaxa 3558: 1-77.
 * Pfeiffer M., and D. Mezger. 2012. Biodiversity Assessment in Incomplete Inventories: Leaf Litter Ant Communities in Several Types of Bornean Rain Forest. PLoS ONE 7(7): e40729. doi:10.1371/journal.pone.0041090
 * Pfeiffer M.; Mezger, D.; Hosoishi, S.; Bakhtiar, E. Y.; Kohout, R. J. 2011. The Formicidae of Borneo (Insecta: Hymenoptera): a preliminary species list. Asian Myrmecology 4:9-58
 * Zhou S.-Y. and Xu Z. 2003. Taxonomic study on Chinese members of the ant genus Strumigenys F. Smith (Hymenoptera, Formicidae) from the mainland of China. Acta Zootaxonomica Sinica28(4): 737-740.