Genus Tanaotrichia Warren, 1893 Tanaotrichia Warren, 1893, Proceedings of the Zoological Society of London: 360. Type species: Tanaotrichia prasonaria trilineata Warren, 1893 (now a nominotypical subspecies) (TL: Sikkim, India, Alt: 900–1600 m) Genus Description (Warren 1893; Prout 1913, 1938) Antenna filiform in female; quadripectinate in male with long ciliated branches shortens towards apex. Frons slightly convex or protruded. Labial palpi short, forwardly or upwardly directed, hardly reaching the frons. Proboscis well developed. Foretibia with single median epiphysis [Fig. 3b: (i)]; midtibia with a terminal pair of spurs; hindtibia without median spurs or sometime with a Rhodostrophia like ‘pseudospur’ and a single well-developed terminal spur accompanied with a tuft of rather compact and short hairs (looks like a spur at first glance without close inspection); hair-pencil long, concealing all the spurs [(Fig. 3b: (ii)]. Forewing with two areoles like in Rhodostrophia; veins R2–R4 stalked, R1 beginning close to the apex of the 2 nd areole in front of the origin of R5. Cell nearly half the length of the wing (Fig. 3b: FW). Costa nearly straight but more curved near the apex; outer margin curved and more oblique towards anal angle; ground color reddish-ochreous or reddish or sometimes ochreous, with scattered minute red irroration; often with three dark fuscous or brownish transverse lines, (similar to those in R. bisinuata subspecies complex, Fig. 29: Male, Holotype, NHMUK), variations occur in the development and course among the species. Hindwing venation (Fig. 3b: HW) similar to Rhodostrophia; outer margin rounded, sometimes slightly protruded at M3; markings similar to forewing but lack antemedial line; anal angle rather marked (Figs 30–32). Male genitalia (Figs 40, 47, 54): Uncus sclerotised, setose, somewhat flat, with a broad apex (Fig. 40), often diagnostic at species level. Gnathos triangular, sclerotised, medially elongated with acute tip. Valva shape distinguishing. Posterior margin of the 8 th abdominal sternite bilobed (Fig. 54). Aedeagus thin, elongated and curved (Fig. 47). Female genitalia (Fig. 62): Corpus bursae with a double-ridged, longitudinal band-like signum with sclerotised scobination. Immature stages: Larval and pupal stages are unknown. Distribution: Himalaya and West China (Prout 1913, 1938). Differential diagnosis: Discussed in detail under the Rhodostrophia genus.

Published as part of Kumari, Shabnam, Bandyopadhyay, Uttaran, Uniyal, Virendra Prasad, Chandra, Kailash & Hausmann, Axel, 2024, Integrative taxonomic review of the genus Rhodostrophia Hübner, 1823 and its allied genus Tanaotrichia Warren, 1893 (Lepidoptera: Geometridae) from the Western Himalaya, pp. 59-89 in Zootaxa 5519 (1) on pages 78-79, DOI: 10.11646/zootaxa.5519.1.3, http://zenodo.org/record/13915528