Description of the females of two species of the genus Lasaia (Lepidoptera: Riodinidae) and new records for Mexico Author Arellano-Covarrubias, Arturo Museo de Zoología (Entomología), Departamento de Biología Evolutiva, Facultad de Ciencias, Universidad Nacional Autónoma de México, Av. Universidad 3000, Circuito Exterior S / N, C. P. 04510, Ciudad de México, México. & Posgrado en Ciencias Biológicas, Universidad Nacional Autónoma de México, Av. Universidad 3000, 04510, Ciudad de México, México Author Luis-Martínez, Armando 0000-0002-1044-3986 Museo de Zoología (Entomología), Departamento de Biología Evolutiva, Facultad de Ciencias, Universidad Nacional Autónoma de México, Av. Universidad 3000, Circuito Exterior S / N, C. P. 04510, Ciudad de México, México. & alm @ ciencias. unam. mx; https: // orcid. org / 0000 - 0002 - 1044 - 3986 alm@ciencias.unam.mx Author Llorente-Bousquets, Jorge 0000-0002-9542-2358 Museo de Zoología (Entomología), Departamento de Biología Evolutiva, Facultad de Ciencias, Universidad Nacional Autónoma de México, Av. Universidad 3000, Circuito Exterior S / N, C. P. 04510, Ciudad de México, México. & enantia @ prodigy. net. mx; https: // orcid. org / 0000 - 0002 - 9542 - 2358 enantia@prodigy.net.mx text Zootaxa 2023 2023-01-26 5231 1 24 36 http://dx.doi.org/10.11646/zootaxa.5231.1.2 journal article 10.11646/zootaxa.5231.1.2 1175-5326 7571507 0A3DFE05-1829-4C61-88B7-EC928F1DFB98 Lasaia arsis Staudinger [1887] ( Figures 1A, 1B , 2A , 3A ) Description ♀ . n=1; FW= 15.46 mm ( Fig. 1B ). Head . Brown hairy eyes, with white scales at the palps; ocular ring with white-brown scales; frons with white and brown scales. Antennae . Black with rounded white scales. Abdomen and thorax . Brown scales in the dorsal view and white in ventral view. Legs. White scales over all the legs. Forewing (dorsal view). Background coloration brown with white and black spots. Marginal region with black spots between R 4 -1A+2A; the ones between R 4 -M 1 and CuA 2 -1A+2A wider. Postmedial region have spots of different sizes, the ones that are near of apex, between veins R 3 -M 2 , are wider and have trapezoidal shape; those between M 2 -1A+2A are thinner and have a zigzag shape. Medial, submedial and post-basal regions, have the typical spots of the genus. Hindwing (dorsal view) . Background coloration brown with white and black spots. Marginal region with irregular spots between apex to tornus. Spots between veins Sc+R 1 -M 2 of the postmedial region, have a trapezoidal shape and are wider compared to the other spots of this region. Spots between veins Sc+R 1 -CuA 1 of the medial region, are enlarged compared to the rest of spots in that area. Submedial and post-basal area have lineal spots. FIGURE 1 . Males and females of Lasaia arsis (A and B), and L. pseudomeris (C and D) in dorsal and ventral view. Scale bars correspond to 1 cm. Genitalia. Corpus bursae thick, globe-shaped, without signa; ductus bursae membranous, wide near of corpus bursae, and thin in the region near the ostium bursae, approximately 1.5 times longer than the corpus bursae; in ventral view it is in the middle part of the sternite 8; sternites 6, 7 and 8 are sclerotized ( Fig. 2A ). Material examined. Brazil : 1 ♀ (USNMENT 01588358). Rondônia : 62 Km S Ariquemes , 165 m . Faz. Rancho Grande. Ron Leuschner leg.; -10.5333 , -62.8000 ; 18-29 Sept. 1996 . Diagnosis . Females of L. arsis can be distinguished from females of other species of Lasaia by the general whitish coloration on the wings underside, also, it is larger than other known females. On the hind wings, the spots near at the apex, are larger and wider ( Fig. 3A ), when compared to other species of the genus v. gr. L. agesilas callaina and L. sula sula ( Figs. 3C and 3D , respectively) Distribution. Based on label data of examined specimens, this taxon is distributed in Mexico , Costa Rica , Panama , Colombia , Ecuador , Peru , French Guiana, Brazil , Argentina (mainly on the Pacific slope), Paraguay and Venezuela ( Fig. 4 ). The elevations range from sea level to 1400 m s.a.l., approximately.