Lasius hayashi

This species nests in dead portions of tree trunks, especially at or near the roots. Nuptial flights occur in July and August (Japanese Ant Image Database).

Identification
Japanese Ant Image Database - Total length of workers around 2 - 4 mm. Head and mesosoma light brown, gaster dark brown. Antennal scapes usually slightly shorter than the head width, and with erect hairs. Petiole high, its tip acutely angulate; anterior margin of petiolar scale not angulate.

Seifert (2020) - Lasius hayashi is separable from the sympatric and similarly hirsute Lasius japonicus by its broader head, shorter scape, more convex petiole sides and a homogenously yellowish brown head capsule.

Distribution
Upper-altitudinal occurence records: 600 m at 44°N in Hokkaido and 1600 m at 34°N in Shikoku.

Distribution based on Regional Taxon Lists
Palaearctic Region: China, Democratic Peoples Republic of Korea, Japan, Republic of Korea, Russian Federation.

Biology
Seifert 2020, summarizing Yamauchi 1979 and Yamauchi, Ito, Suzuki 1986 - Main habitat is shady deciduous woodland with large trees. The nests are mostly constructed within the root systems or in hollow trunks of trees and sometimes in rotten logs and may contain carton structures. Being active in Sapporo to mid November, L. hayashi has a longer foraging season than sympatric congeneric species. The foraging paths are almost completely covered by macerated plant and humus material both on tree trunks and on the ground near the tree where trophobiotic Homoptera are tended. Flights were observed from early July to late August and start in the late evening at light intensities of only 0–10 lux and air temperatures of 22– 24°C. Air movements and rain stop the flight.

Nomenclature

 *  hayashi. Lasius hayashi Yamauchi & Hayashida, 1970: 510, figs. 1, 5, 7, 8, 11 (w.q.m.) JAPAN. See also: Collingwood, 1976: 305; Yamauchi, 1979: 158; Kupyanskaya, 1990: 220; Seifert, 1992b: 45.

Worker
Seifert (2020) - Large (CS 994 µm). Head shorter than in other sympatric species (CL/CW900 1.049) and usually with concave posterior margin. Scape rather short (SL/CS900 0.978). Postocular distance medium and eye rather small (PoOc/ CL900 0.241, EYE/CS900 0.230). Torulo-clypeal distance rather large (dClAn900 5.07). Number of mandibular dents rather low (MaDe 7.95). Terminal segment of maxillary palp rather long (MP6/CS900 0.194). Pubescence on clypeus moderately dense (sqPDCL900 4.59); on frons rather short (PLF900 28.4); on scape subdecumbent to suberect and difficult to distinguish from shorter setae; on hind tibia decumbent to appressed, contrasting the situation in the long, suberect to erect setae. Gular and pronotal setae long (GuHL/CS900 0.114, PnHL/CS900 0.154). Whole body covered by numerous standing setae (nOcc900 13.1, nGen900 5.1, nGu900 6.4, nSc900 18.3, nHT900 17.4, nSt900 4.9). Coloration: mesosoma, petiole, scape, femora and tibiae pale yellowish brown, head darker yellowish brown, gaster blackish brown or dark brown with yellowish tinge.

Abbreviations given above for measurements, ratios and functions are defined here: Seifert 2020 Lasius characters. Also see table 11 in Seifert 2020 for morphometric measurements, ratios, and functions.

Type Material
Seifert (2020) - One paratype worker from the holotype nest series labelled ”Sapporo Hokkaido 27-VII-1967 K. Yamauchi“; depository.

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