Calamotropha unicolorellus

Calamotropha unicolorellus (Zeller, 1863) Chilo unicolorella Zeller, 1863. Type locality: Himalayas. Błeszyński, 1961 e: 215 (Calamotropha) Figs. 44, 104, 162. MATERIAL 1 ♂, 1 ♀ (detailed information in Table S1; https://doi.org/ 10.5061/dryad.b8gtht7mh). SIMILAR SPECIES Calamotropha shichito (Marumo, 1931); Calamotropha pseudodielota Błeszyński, 1961. DIAGNOSIS This species is separated form other Calamotropha species of the Philippines by the uniform brown color of the forewing with the dashed postmedian black line and the marked marginal black triangular spots. In male genitalia (Fig. 104), the basal lobe on the posterior margin of tegumen arms; the flat, spatula-shaped gnathos; and the two heavily sclerotized rods on the vesica are shared with Calamotropha shichito and Calamotropha pseudodielota. The valva of C. unicolorellus lacks the dorsal bump observed in C. pseudodielota, while the evenly curved ventral margin separates it from C. shichito, which has a rather straight ventral margin. The female genitalia (Fig. 162) has enlarged posterior apophyses with thinly dented margins also observed in C. shichito and C. pseudodielota. From C. shichito, it can be separated by the base of the ductus bursae after the antrum which is membranous and straight, while it is lightly sclerotized and kinked in C. shichito (Kim et al., 2023), as well as the posterior apophyses which run straight anterad, while anterior half is bent upwards in C. shichito. The antrum shows an anterior conical part and a posterior shorter, funnel-shaped part. DESCRIPTION OF THE MALE GENITALIA (FIG. 104) Uncus about 7/6 of tegumen arm length, narrow, straight, apex blunt. Gnathos projection about half the length of uncus, apex broad, spatula-shaped. Tegumen arms with posterior margin forming rounded bump on basal half. Valva ventral margin evenly curved upwards; dorsal margin straight; subdorsal ridge projection on innerside of valva; apex truncated, subapically with patch of thick setae. Vinculum large, triangular, with protruding saccus. Vesica bearing two apical heavily sclerotized rods. DISTRIBUTION INDIA; MALAYSIA: Sarawak; PHILIPPINES: Mindanao (Surigao del Sur), Samar; SRI LANKA. Collected at altitudes between 50 and 200 m. REMARKS Female genitalia match that of the specimen GS-1334 from Manilla, Philippines, illustrated in Błeszyński (1961: Fig. 209). Błeszyński (1961) notes that “it is possible that the females of C. unicolorella (ZELL.) belong to the species here described [C. pseudodielota]. However, the two differ in the coloration of head and vertex, in any case all the species of the C. dielota MEYR. -group are nearly indistinguishable on their facies. Too little material is avai[l]abe for my study to clarify this question.”