Siobla foveata Niu & Wei 2011

Siobla foveata Niu & Wei, 2011

(Figs 2 c, 2d, 5k, 5l, 8b, 12b, 14j, 15j, 18g –l)

Siobla foveata Niu & Wei, 2011: 156. Ƥ, type locality: Nantou, Taiwan (China).

Variation. There is considerable variation in sculpture of the upper head, mesonotum and 1st tergite, which may be clearly stronger denser than in the holotype. The metallic blue colour of the head and thorax sometimes turns into coppery green or purple, even if the most common colour is metallic blue. The wings are darkened from apical third to apical two thirds in the females. Females 13-16 mm, males 12-14 mm.

Distribution. China (Taiwan).

Remarks. This species is similar to S. leucotarsis, but differs from the latter by the following: middle fovea broad and deep; cell C dark brown; inner orbit of female shiny; mesoscutellum strongly elevated, distinctly higher than top of scutum; the apical half of forewing strongly infuscated; the basal half of hind tibia and metabasitarsus entirely yellow, the apex of hind tibia slightly enlarged, 2.2 × as broad as the base of tibia, metabasitarsus 4.5 × as long as broad; each femur, tibia and tarsus of male orange brown. In S. leucotarsis: middle fovea small; cell C brown; inner orbit of female sparsely punctured; mesoscutellum roundly elevated, as high as scutum; the apical 1/4 of forewing infuscated; the basal 1/3 of hind tibia white, metabasitarsus entirely bluish purple, the apex of hind tibia distinctly enlarged, 2.8 × as broad as the base of tibia in length, metabasitarsus 3.6 × as long as broad; the apical 2/3 of fore and middle tibiae blackish brown, apical 2/3 of hind tibia and metabasitarsus bluish purple; in male, femora, tibiae and tarsi not orange brown, but similar to the female.