Brachyponera chinensis

From Mackay and Mackay (2010): Smith (1934), Koriba (1963) and Gotoh and Ito (2008) summarized the biology of this species. Small colonies were found in moist rotten wood or in the soil under stones, logs, debris, etc. (Smith, 1934). Sexuals were found in a nest in August in Norfolk, Virginia. Foragers were more active on cloudy days as compared with sunny days. They fed on dead insects, fish scraps and juices of decayed fruits lying on the ground. People at one unspecified locality claimed that they were occasionally stung. At the time of collection (spring, 1932) they were most common in the vicinity of the docks. They occurred over the entire town of Washington, North Carolina and to a lesser extent of Norfolk, Virginia. These ants are unusually common and successful in China and apparently feed on dead insects (Brown, 1958).

Identification
From Mackay and Mackay (2010): Pachycondyla chinensis is an Old World species that was introduced into the New World. The combination of poorly developed mandibular teeth, the constriction at the metanotal suture and the form of the subpetiolar process, with a posteriorly directed lobe separate this species from all of the others present in the New World. Only the introduction of additional Old World species would make recognition of this species difficult.

Distribution
United States, Japan and China. (Mackay and Mackay 2010)

This taxon was described from China.

Habitat
From Mackay and Mackay (2010):Smith (1979) reports they occur in dark damp habitats in urban environments (Smith, 1934) and disturbed rural environments (Brown, 1958).

Worker
From Mackay and Mackay (2010): The worker is a small (total length 3.5 mm) brown specimen with yellowish brown mandibles, funiculi and legs. The mandibles have approximately 9 teeth, which alternate in size. The three apicalmost teeth are the largest with the first tooth approximately twice the length of the other two, which are approximately the same size. The transverse medial carina is poorly marked on the clypeus, the sides of the head are nearly parallel and the posterior margin is slightly concave. The head length is 0.88 mm; the head width is 0.75 mm. The eye is relatively large (maximum diameter 0.15 mm), located less than one diameter from the anterior margin of the head. The scape (0.85 mm) extends approximately two funicular segments past the posterior lateral corner of the head. The funicular segments are slightly swollen toward the apex, but do not form a club. The mesonotum is well defined on all sides and the mesosoma notably depressed at the metanotal suture. The propodeal spiracle is circular. The petiole is narrow when viewed in profile, with the anterior face being slightly concave near the apex and posterior face being slightly convex. Both faces narrow towards the apex and form a small horizontal dorsal surface. The subpetiolar process is a broad thick lobe, with a posteriorly directed sharp process. The metasternal process consists of two fang-like sharp elongate projections, similar to those found in members of the stigma species complex.

Erect hairs are sparse, but are present on the mandibles, clypeus, frontal lobes, a few hairs are present on the dorsum of the mesosoma, dorsum of the petiole and all surfaces of the gaster, a few hairs on the legs are erect. Very fine appressed sparse golden pubescence is found on most surfaces.

The mandibles are finely striated with scattered punctures the dorsum of the head is very finely and densely punctate and weakly shining, the dorsum of the mesosoma has similar sculpture. The sculpture on much of the side of the mesosoma, especially the side of the pronotum and mesopleuron and the lower part of the propodeum is smooth and glossy. The petiole has scattered punctures and is weakly shining; the gaster is sculptured and is slightly shinier.

Queen
Queens are not known for this species.

Male
Males are not known for this species.

Etymology
The name means that this species is from China. (Mackay and Mackay 2010)

Additional References

 * Brown, W. L. 1958. A review of the ants of New Zealand. Acta Hymenopterologica 1:1-50.


 * Gotoh, A. and F. Ito. 2008. Seasonal cycle of colony structure in the Ponerine ant Pachycondyla chinensis in western Japan (Hymenop-tera: Formicidae). Insectes Sociaux 55:98-104.


 * Koriba, O. 1963. Colony founding of a female of Brachyponera chinensis in the observation cage. Kontyû 31:285-289 [in Japanese].




 * Smith, D. 1979. Formicoidea. In: Catalogue of Hymenoptera in America North of Mexico, K. Krombein, P. Hurd, D. Smith and B. Durks (eds). Volume 2: 1323-1467. Smithsonian Institute, Washington D. C.


 * Smith, M. R. 1934. Ponerine ants of the genus Euponera in the United States. Annals of the Entomological Society of America 27:557-564.