Dicharax khasiacus (Godwin-Austen, 1871) Fig. 68 Alycaeus Khasiacus Godwin-Austen, 1871: 90, pl. 3 fig. 4. Alycaeus duorugosus Godwin-Austen, 1914: 391. Syn. nov. Alycaeus khasiacus – Sowerby 1877: pl. 1, species 8. — Godwin-Austen 1914: 356, 376–377, 393, pl. 143 figs 7, 7a–b. Alycaeus (Dicharax) khasiacus – Kobelt 1902: 372–373. — Gude 1921: 257–258. Alycaeus khasiacus var. – Godwin-Austen 1914: 356. Alycaeus (Dicharax) duorugosus – Gude 1921: 249. Chamalycaeus (Dicharax) duorugosus – Ramakrishna et al. 2010: 59. Chamalycaeus (Dicharax) khasiacus – Ramakrishna et al. 2010: 62. Dicharax (?) khasiacus – Páll-Gergely et al. 2020: 90. Dicharax (?) duorugosus – Páll-Gergely et al. 2020: 86. Diagnosis Dicharax khasiacus is characterized by the rounded outline, the short, smooth R2, and the two, anteriorly situated R3 swellings. Type material examined INDIA • 29 syntypes of A. khasiacus (Fig. 68A–E); Lailangkote, Khasi Hills; NHMUK 1903.7.1.2650 • 1 syntype of A. duorugosus (Fig. 68F–J); Burrail; Godwin-Austen coll.; NHMUK 1903.7.1.2771. Additional material examined INDIA • 4 shells; Jawai, Assam; Oberwimmer coll.; NHMW • 2 shells; same data as for preceding; NHMW 14711 • 4 shells; Jawai, India; Dr. Leo P. Rušnov coll., ex coll. Dr W. Blume ex coll. W.F. Webb; NHMW 15168. Type localities “On the highest parts of the Khasi and Jiantia Hills” (A. khasiacus); “Burrail Range, Naga ” “Also Angaoluo Trigonometrical Station, No. 2572; South Barak, No. 2629, and Munipur, No. 2654 B.M.” (A. duorugosus). Differential diagnosis Dicharax lahupaensis has a ribbed R2 (smooth in D. khasiacus) and a thicker peristome. Dicharax akhaensis is larger, has a shorter R3 swelling, and a less fringed aperture. Remarks The single examined syntype of A. duorugosus fits the morphological variability of the 29 syntypes of A. khasiacus; therefore the former is a junior synonym of the latter.

Published as part of Páll-Gergely, Barna, Gojšina, Vukašin & Aravind, Neelavar Ananthram, 2025, A review of Chamalycaeus, Cycloryx and Dicharax species of the Himalaya and Myanmar and seven new species of Alycaeinae from the Blue Mountain, Mizoram, India (Gastropoda, Caenogastropoda, Cyclophoridae), pp. 1-158 in European Journal of Taxonomy 1029 on pages 115-117, DOI: 10.5852/ejt.2025.1029.3131, http://zenodo.org/record/17864673