Burns, J.M. (2000) Pyrgus communis and Pyrgus albescens (Hesperiidae: Pyrginae) are separate transcontinental species with variable but diagnostic valves. J. Lep. Soc. 54: 52-71.
Austin, G.T. (2000) Hesperiidae of Rondonia, Brazil: "Antigonus" genus group (Pyrginae), with taxonomic comments and description of new species from Brazil and Guatemala. J. Lep. Soc. 54: 1-28.
ABSTRACT: Some species of the pyrgine (Hesperridae) "Antigonus" group (sensu Evans 1953) occurring in central Rondonia, Brazil, are discussed. These are six species of Mylon Godman & Salvin, 1894, including two new species Mylon simplex and Mylon argonatutarum; four species of Carrhenes Godman & Salvin, 1895, including the new species Carrhenes recurva; four species of Clito Evans, 1953, including the new combination Clito clada, new status; one species of Xenophanes Godman & Salvin, 1895; three species of Antigonus Huebner [1819]; and one species each of Timochreon Godman & Salvin, 1896, and Anisochoria Mabille [1877]. Taxonomic comments and illustrations (including male and female genitalia) are provided for these and for some related taxa from elsewhere. The identities of Leucochitonea jason Ehrmann, 1907, and Mylon ozema var. exstincta Mabille & Boullet, 1917, are clarified. A lectotype is designated for L. jason. The holotype of M. o. var. exstincta is identified and M. exstincta, new status, is raised from its current synonymy with M. jason. Mylon cristata, new species, is described from Guatemala. Carrhenes chaeremon (Mabille, 1891), revised status; Carrhenes leada (Butler, 1870), revised status; and Carrhenes lilloi Hayward, 1947, revised status, are raised to specific level taxa from their current subspecific or synonymic placements.

Burns, J. M. and D. H. Janzen (2000) Drephalys: Division of this showy neotropical genus, plus a new species and the immatures and food plants of two species from Costa Rican dry forest (Hesperiidae: Pyrginae). J. Lep. Soc. 53: 77-89.
The genus Drephalys is divided into two subgenera: Drephalys and Paradrephalys new subgenus. A new species D. kidonoi is described.


I thank the following people for sending me their books and/or reprints:
Frank Hsu, Mike Parsons, Hitoshi Sugiyama, Andy Warren