Key to species of Thiallela based on adult 1. Postmedial line white................................................................................. 2 - Postmedial line black................................................................................. 4 2. Two discal spots fused, crescent-shaped................................................................... 3 - Two discal spots separated (Li & Ren 2006, Fig. 3).................................................. T. hiranoi 3. Forewings with a narrow white line edged along dorsal 2/5 of antemedial line (Li & Ren 2006, Fig. 2)......... T. platantra - Forewings with a small white dot bordering antemedial line and adjacent to dorsal margin (Li & Ren 2006, Fig. 1) T. naevilla 4. Male flagellum with basal segments dilated, has a small notch near base......................................... 5 - Male flagellum simple, simple, basal segments not dilated, without notch........................................ 6 5. Male flagellum with first five segments dilated, sixth segment distinctly notched; forewing yellowish ocherous in basal major- ity region (Fig. 2).......................................................................... T. epicrociella - Male flagellum with first three segments slightly dilated, fourth to sixth segments distinctly notched; forewing grayish yellow in basal majority region (Fig. 5)....................................................... T. sulciflagella sp. nov. 6. Forewing diffused lots of grayish white scales near antemedial line in basal region, antemedial line arched (Fig. 3) T. ligeralis - Forewing without grayish white scales in basal region, antemedial line sinuate (Fig. 4)............. T. celadontis sp. nov.

Published as part of Yang, Linlin & Ren, Yingdang, 2018, Two new species, one unrecorded species, and one newly reported male of genus Thiallela Walker, 1863 from China (Lepidoptera: Pyralidae: Phycitinae), pp. 436-450 in Zootaxa 4387 (3) on page 439, DOI: 10.11646/zootaxa.4387.3.2, http://zenodo.org/record/1187645