Lepisiota siamensis

The type series was collected from soil in a paddy field (the same locality as the type colony of Lepisiota bicolor) at an elevation of about 900 m above sea level.

Identification
Lepisiota siamensis is most similar to Lepisiota lunaris from India in having a dark to black and shining body, a reticulated head, and yellowish-brown antennae. However, L. siamensis can be easily separated from L. lunaris by:
 * 1) head slightly longer than broad (almost as long as broad in L. lunaris)
 * 2) area between eye and mandibular base finely striate (slightly smooth in L. lunaris)
 * 3) outer margin of eye reaching lateral margin of head (not touching in L. lunaris)
 * 4) pronotum as long as broad (shorter than broad in L. lunaris)
 * 5) in profile tip of propodeal spine bluntly angulated (tip of propodeal spine sharply angulated in L. lunaris)
 * 6) dorsal outline of propodeum weakly convex (almost straight in L. lunaris)
 * 7) petiolar spines pointed above (curve backward in L. lunaris)

This species is also similar to Lepisiota acuta in general appearance. However, it can be distinguished from the latter by:
 * 1) pronotum smooth and shiny (densely punctate in the latter)
 * 2) in profile propodeal spines bluntly angulated (sharply angulated in the latter)
 * 3) dorsal outline of propodeum weakly convex (straight in the latter)
 * 4) petiolar spines pointed above (curve backward in the later)
 * 5) femora reddish brown (darker in the latter)

Distribution
Thailand: Chiang Rai Province.

Distribution based on Regional Taxon Lists
Oriental Region: Thailand.

Nomenclature

 * . Lepisiota siamensis Jarernkong et Jaitrong, in Jarernkong et al., 2023: 6, fig. 2 (w.) THAILAND.

Type Material

 * Holotype – worker (THNHM-I-26819, THNHM), N Thailand: Chiang Rai Province, Muaeng District, Pong Nam Ron Village, 21.X 2018, W. Jaitrong leg., WJT211018-06.
 * Paratypes: 23 workers (THNHM-I-26820 to THNHM-I-26841, THNHM), same data as holotype.