Material. Boyaca, Region of Muzo [-800 m], P. Sanchez, 1935 (MCZ 136470); ?Cundinamarca, "Bogota, Distrito Especial" (UF 161263 [not seen]); Sta. Fe de Bogota, ex Sowerby & Fulton (MHNN 35.51); Bogota (ANSP, lectotype of Drymaeus cognatus); Ibidem, ANSP 452359, three paralectotypes; Ibidem, FMNH 78764, paralectotype ex ANSP 78543; Ibidem, MCZ 64885, paralectotype ex ANSP 78543); Ibidem, ex Webb ex Sowerby and Fulton (FMNH 31408); Ibidem, ex Webb (FMNH 31476); Ibidem, ex Vassar (MCZ 156700); Ibidem (NHMUK n.c. [partim]); Ibidem, ex Sowerby (RMNH MOL.266131); Ibidem (UF 109117, 206150); Ibidem, ex Fulton (USNM 124981); Ibidem, ex Henderson (USNM 307610); Ibidem, ex Chamberlain ex Fulton (USNM 530530); Huila, Pital [-900 m], L.M. Murillo, 2.xi.l939 (MCZ 112467); San Agustin [-1700 m], leg., ix.2006 (FEM 44181); Ibidem, leg., i.2007 (FEM 46809); [without detailed locality] (JMR); Meta, 10 km NW of Villavicencio (towards Bogota) [-1150 m], on vegetation on ground (JMR). Ecuador, "Ecuador" (ZMH 7269).
Altitudinal range. Based on the precise localities known, the range is -800—1700 m.
Ecology. The species is found in the Magdalena Valley and Cordillera Oriental montane forests ecoregions. Found alive on cocoa plants (MCZ 112467).
Remarks. The first precise localities cited are in the Departments of Meta, Boyaca and Huila. RICHARDSON (1995) grouped D. cognatus with D. membielinus. Judging from the description and comparing with the figure given by CROSSE (1868: pi. 1 fig. 2) and the syntypes, we disagree with his judgement. The type specimen of D. membielinus (BREURE & ARAUJO 2017: 77, figs 29G-J) lacks the strong columellar fold present in D. cognatus, and is also less elongate. It must be noted that the type localities of both D. cognatus, and D. membielinus are imprecise, and although D. cognatus may actually occur further south, we were unable to find specimens from further south than San Agustin, Colombia. Likewise, we have no records from Ecuador. The two species are undoubtedly closely related.