♀ (Type). Length about 4 mm.; head broad and short, with very wide face; clypeus and labrium entirely black, as also supraclypeal area; lateral face-marks present, pale yellow, long and very narrow, a little broadened below. The upper end, on orbit, a little above level of antennae; mandibles yellowish-white with the apical part broadly ferruginous; scape slender, yellow in front; flagellum thick black, the under side pale yellowish; front and vertex shining, dark olive green; thorax shining dark green, the mesothorax and scutellum very brilliant, mesothorax with thin erect white hair; tubercles, a slender line along sides of mesothorax above base of wings, and a short stripe at each side on upper border of prothorax, all pale yellow; wings clear hyaline, nervures practically colorless ; stigma large, hyaline, with a dusky border ; hind legs black, except that the femora are yellow beneath; middle legs with the femora broadly yellow at apex and the tibiae yellow in front; front legs similarly colored, the tihiae very broadly pale yellow; anterior and middle basitarsi pale yellow and the small joints reddish, but hind tarsi black; abdomen shining, dorsally dark, slightly brownish, the first tergite with only a very small yellow mark at each side; tergites 2 to 4 with successively broader pale yellow bands, having a linear interruption in middle; fifth tergite broadly yellowish on each side; apical plate pale reddish; venter light yellow.
Note on certain lichens
