Material. Cundinamarca, Bosque de Chico [NE of Bogota], 2700-2800 m, H. Sturm leg. (SMF, holotype chicoensis); La Calera, 2820 m, E. Linares leg., iii.1978 (ICNB 674). Ecuador, Nono, R. Cousin leg., ex Clapp (CM 4 86212); Santo Domingo, ex Richardson (DMNH 76687); Canelos, ex Jackson (DMNH 135202,147553); Mt. Chimborazo skirts, ex Jackson (DMNH 147555); Pichincha, ex Jackson (DMNH 147564); Mindo, close to the Rio Blanco, ex Jackson (DMNH 147567); Ibidem, Guarumos (DMNH 147563); Imbabura, A. Gonzalez leg., vii.2011 (FEM 5023, 91168); Canelos (DMNH 135202, 135279); Puyo, ex Jackson (DMNH 147565); Topo, ex Jackson (DMNH 147571); Ibarra, ex Jackson (DMNH 150712); Santo Domingo de los Colourados (FMNH 85376); Ibidem, ex Jackson (MCZ 227645);
Ibidem, ex Jackson (DMNH 163666); Quito, Chiquilpe, ex Webb (FMNH 31299); Llou, A. Cousin leg., ex Webb ex Dautzenberg (FMNH 31350); Tumbaco, vi.2011 (FEM 91169 [subadult]); "Tunguragua" [sic, Tungurahua], ex Cuming (NHMUK, lectotype fallax); Naranjal, Quito road, above Yokuchaki, 2500 m, O.L. Haught leg. (USNM 534059). ?, Quito, ex E.R. Mayo (MCZ 88122), Ibidem, ex Evezard ex Henderson ex Cuming (USNM 316094); Ibidem, L. Taylor leg., 1879 (ZMUZ 512143); Ibidem, Vimont leg., 1882 (ZMUZ 512146); Ecuador, T. Prime leg., ex Clapp (CM 113637 ); Ibidem, ex Bequaert (MCZ n.c); Ibidem, ex Sowerby (ZMUZ 512145); "Prov. of Quito" (NHMUK, lectotype of abscissus).
Altitudinal range. The few precise localities available range 1200-2500 m.
Ecology. The Colombian localities are situated within the Cordillera Oriental montane forests ecoregion. The actual habitat is unknown.
Remarks. Several specimens at DMNH were found under various MS-names by Jackson; with one exception, all fall within the morphological and colour variation of Drymaeus fallax. Specimens from some localities in Ecuador (DMNH 135197, 147556, 147569) seem to differ but we prefer herein to suggest further research before describing them formally as new taxon. The specimens from Colombia, previously distinguished as D.fallax chicoensis, are herein synonymised with the nominate taxon because the variation in shell shape observed seems to unite the two, despite there being no records from the intermediate region. This fact may need further study and consideration. Re-examination of the type material of D. fallax fallax and D. abcissus, as well as comparison with more recently collected material of D.fallax, makes evident that the ranges of shell shape, and of colouration variation of D.fallax, includes the morphology and colour of D. abcissus, making these taxa undistinguishable.