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For most of the last 150 years, Tricheilostoma Jan, 1860 has resided in the synonymy of other snake genera such as Glauconia Gray, 1845 and Leptotyphlops Fitzinger, 1843 (Boulenger, 1893; McDiarmid et al., 1999). Thus there has been less practical concern over the identity of the type species. This changed recently with the proposal of a new classification of the family Leptotyphlopidae and resurrection of the Genus Tricheilostoma (Adalsteinsson et al., 2009). Pinto et al. (2010) alluded to a potential taxonomic problem with the type species of that genus, but determined that no change was necessary. However, the problem remains and affects 15 species of South American and African snakes. The purpose of this note is to resolve the issue and make the necessary taxonomic changes. The name Tricheilostoma was introduced by Jan (1860) without diagnosis or type species designation, in a figure legend of an issue ("livraison") presenting snake illustrations. It was in one of a series of issues treated here as a periodical, Iconographie Générale des Ophidiens, comprising three volumes (Volume 1, 1860–1866; Volume 2, 1866– 1870; Volume 3, 1870–1881). Authorship of the separate issues was attributed to Georges Jan, as noted in the headers of the plates and in new taxa described in figure legends, although the volumes were edited by Jan and Ferdinand Sordelli. Tricheilostoma was used in the first issue as a subgenus for two African species (Stenosoma gracile Jan, 1860, and S. bicolor Jan, 1860). In the second issue of Volume 1, appearing in 1861, it was used as a subgenus for a New World species (S. macrolepis Peters, 1858) and another African species (S. sundewalli Jan). As pointed out by McDiarmid et al. (1999), some confusion has existed over the dates of publication of names proposed by Jan. In part, this is because some explanatory text was published separately in a journal (Jan 1861b) and different collections of issues can be found bound together in various libraries. Loveridge (1957) mistakenly designated Stenosoma macrolepis as type species of Tricheilostoma, referring to the journal article (Jan 1861b). Pinto et al. (2010) acknowledged the mistake but considered his type designation to be valid based on Art. 70.2 of the ICZN which states that an earlier, overlooked, type fixation should be accepted and any later fixations treated as invalid. However, that article is irrelevant here because no type was ever correctly fixed. One of the two African species mentioned by Jan, Stenosoma gracile, is now a synonym of the other, S. bicolor. Thus, I designate Stenosoma bicolor Jan, 1860 as the type species of Tricheilostoma Jan, 1860. That genus now contains four species: Tricheilostoma bicolor (Jan, 1860), T. broadleyi (Wallach & Hahn, 1997), T. greenwelli (Wallach & Boundy, 2005), and T. sundewalli (Jan, 1861a) (Adalsteinsson et al., 2009). Guinea Hedges, Adalsteinsson, & Branch, 2009 in Adalsteinsson et al. (2009), the genus that previously contained those species, is a homonym of the hymenopteran genus Guinea Koçak & Kemal, 2008. In making these changes, the group of 11 New World species previously placed in Tricheilostoma requires a new genus. For those species, I propose the new generic name Trilepida (from classical Greek; feminine; "three scales") to continue allusion to the character (presence of three supralabials) which is useful—in combination with other traits (brown or pale brown venter, usually 10 midtail scales, moderate anterior supralabials)—in diagnosing the group (Adalsteinsson et al., 2009). I designate Stenosoma macrolepis Peters, 1858, as type species. The genus contains these 11 species (Adalsteinsson et al., 2009; Pinto et al., 2010; Pinto & Curcio, 2011): Trilepida anthracina (Bailey, 1946), T. brasiliensis (Laurent, 1949), T. brevissima (Shreve, 1964), T. dugandi (Dunn, 1944), T. fuliginosa (Passos, Caramaschi, & Pinto, 2006), T. guayaquilensis (Orejas-Miranda & Peters, 1970), T. joshuai (Dunn, 1944), T. koppesi (Amaral, 1955), T. macrolepis (Peters, 1858), T. nicefori (Dunn, 1946), and T. salgueiroi (Amaral, 1955). To summarize, the generic name Tricheilostoma Jan, previously applied to New World species, now replaces the African genus Guinea Hedges, Adalsteinsson, & Branch (the latter name becoming a homonym of Guinea Koçak & Kemal). A new genus, Trilepida, is erected for the New World species previously placed in Tricheilostoma. The total number of recognized genera of leptotyphlopid snakes (twelve) is unchanged. I thank Patrick David and Angela Marion for assistance.

The type species of the threadsnake genus Tricheilostoma Jan revisited (Squamata, Leptotyphlopidae)