Rotastruma stenoceps

Very little is known of the ecology of Rotastruma. Luo & Guénard (2016) found a specimen of this species walking on a railing adjacent to a hiking trail at approximate 21:00 h. The surrounding area of the hiking trail is a monoculture plantation of the tree Lophostemon confertus Wilson & Waterh. Whether or not R. stenoceps is actually nocturnal is unknown at this point because the female may have performed a nuptial flight earlier in the day and could have been looking for a suitable location to start a colony.

Identification

 * With head in full-face view the occipital margin conspicuously concave, the sides of the head convex. (Singapore; East Malaysia: Sarawak) . . . . . Rotastruma recava


 * With head in full-face view the occipital margin more or less transverse, the sides of the head approximately straight. (China: Guangdong) . . . . . Rotastruma  stenoceps

Distribution
Rotastruma stenoceps is known from Hong Kong and the following Chinese provinces: Guangdong, Hubei, Hunan and Yunnan (Luo & Guénard, 2016).

Distribution based on Regional Taxon Lists
Palaearctic Region: China.

Nomenclature

 *  stenoceps. Rotastruma stenoceps Bolton, 1991: 9, figs. 13, 15 (w.) CHINA.

Worker
Holotype. TL 3.7, HL 0.82, HW 0.68, CI 83, SL 0.56, SI 82, PW 0.48, AL 0.92. Maximum diameter of eye 0.22 (0.32 x HW). Answering the description of Rotastruma recava but lacking its concave occipital margin. Sides of head behind eyes with projecting hairs in stenoceps but hairs absent in front of the occipital corners in recava. Propodeal spines of stenoceps shorter and less downcurved than in recava, and its propodeal spiracle closer to the apex of the metapleural gland bulla.

Type Material
Holotype worker, China: Guangdong, DingHu Mts, 60 km W. of Guangzhou, vi.1983 (Z. Boucek).