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Metasinella falcifera (Mills)Sulcuncus falciferus Mills, 1938:183, 188, 190, fig.25-27; Ahsolon and Kseneman, 1942:22, fig. 20;Pearse, 1945:175; Salmon, 1964:483; Reddell,1971b:49; Massoud and Gruia, 1973:335.Metasinella falcifera: Bonet, 1944a:20, 22, 23; DelamareDeboutteville, 1949:119; Vandel, 1964:200-201; Vandel, 1965a:168; Massoud and Gruia,1973:338, 339; Reddell, 1977b:234, 239, 240,241,270.Sulcuncus: Pearse, 1945:174; Salmon, 1964:131,483.Sulcunus falciferus:spelling).Nicholas, 1962:179 (erroneousType-locaIity.-Sazich Cave (=Acfun Sazich), Calcehtok,Yucatan, Mexico.Distribution.-Known only from the type-locality.See Fig. 64.Discussion.-This is a white, eyeless species. Metasinellaalso includes four cavernicole species fromCuba.Pseudosinella bonita ChristiansenPseudosinella bonita Christiansen, 1973: 129-130,131, fig. 1..r._r-....._._.,r .,"'\r-.,r 1·"\/ \\"\(-,~.l-, '\\ \" "­'~(., \\ ...-.~_.-MEXICO(/GUATEMALA.;5 ///.r\r ,......;Fig. 64.-Distribution of troglobitic and troglophilic collembolans of the families Entomobryidae and lsotomidae: 1, Pseudosinellaviolenta; 2, P. reddelli; 3, P. reddelli and P. petrustrinatii; 4, P. petrustrinatii; 5, P. finca; 6, P. bonita; 7, Cyphoderusinnominatus and Troglopedetes maya; 8, Metasinella falcifera; 9, Proisotoma centralis.197