Mystrium camillae

Identification
The following character combination differentiates Mystrium camillae from all its congeners in the Indo-Australian region: the apex of each mandible distinctly expanded and rounded in lateral view, with a more or less triangular and caudally directed tip on the inner side; outer face of labrum entirely covered with a weakly developed, irregular rugoreticulum; maxillary palps 4-segmented; the second segment of the maxillary palp shorter than the basal (first) segment and less than half as broad as the basal segment; antennal segment III shorter than twice its width; each anterolateral corner of the head produced into a short, nearly triangular, pointed spine; dorsum of head with rugose-reticulate cuticular sculpture and spatulate hairs; minute compound eyes; petiolar node not broader than twice its length measured in dorsal view. (Bihn & Verhaagh 2007)

Distribution
Widely distributed in the Indo-Australian region and neighboring countries. Recorded from Australia, Brunei Darussalam, China, India, Indonesia, Malaysia, Myanmar, New Guinea, the Philippines, Singapore and Vietnam.

Distribution based on Regional Taxon Lists
Australasian Region: Australia. Indo-Australian Region: Borneo, Indonesia, Malaysia, Papua New Guinea, Philippines. Oriental Region: India, Myanmar, Vietnam. Palaearctic Region: China.

Nomenclature

 *  camillae. Mystrium camillae Emery, 1889b: 491, pl. 10, figs. 1-3 (w.q.) MYANMAR. Wheeler, G.C. & Wheeler, J. 1952a: 113 (l.); Tjan, Imai, et al. 1986: 57 (k.). Senior synonym of javana: Brown, 1960a: 170; of oculatum: Bihn & Verhaagh, 2007: 3. See also: Menozzi, 1929d: 535.
 * javana. Mystrium camillae subsp. javana Karavaiev, 1925a: 73, fig. 1 (w.) INDONESIA (Java). Junior synonym of camillae: Brown, 1960a: 170.
 * oculatum. Mystrium oculatum Xu, 1998c: 161, figs. 1, 2 (w.) CHINA. Junior synonym of camillae: Bihn & Verhaagh, 2007: 3.

Syntype worker(s) and queen(s) from Bhamo, Myanmar.

Type Material
Bihn & Verhaagh (2007):

Syntype worker and queen: Myanmar (as “Birmania”: Bhamo (Fea) MSCN, not examined.

Mystrium camillae Emery subsp. javana Syntype worker: Java, limestone mountain near Tjampea, no. 2389, 2 workers on the ground, under leaves (Karawaiew) (not examined).

Mystrium oculatum Holotype worker: China: Yunnan Province, Mengla County, Menglun Town, Bakaxiaozhai (Xu Zheng-hui) SWFC (not examined).

Additional References

 * Emery, C. (1889). Formiche di Birmania e del Tenasserim raccolte da Leonardo Fea (1885-87). [part]. Annali del Museo Civico di Storia Naturale, (2)7: 485–512.