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Distribution.-Known only from the type-locality.See Fig. 60.Discussion.-This species is apparently mostclosely related to U. crispus Causey, its geographicallyclosest relative. The genus Unculabes includes fivespecies, all known from caves. Four of these are certainlytroglobites. A fifth species, U. columbinusCausey, from Sotano de las Golondrinas, San LuisPotosi (Causey, 1973), is red and probably should beclassified as a troglophile. Unculabes includes severalrather divergent species, and some may eventually beremoved to other genera.Unculabes causeyae ShearUnculabes sp.: Causey, 1973:118; Reddell and Elliott,1973b:181, 185.Unculabes causeyae Shear, 1974:263, 264-265, 267,fig. 35-38.Type-locality.-Cueva Chica de la Perra, 8 mlnorthwest of Gomez Farias, Tamaulipas, Mexico.Distribution.-Known only from two caves in theSierra de Guatemala, Tamaulipas. See Fig. 60.Records.-Tamaulipas: ?Cueva de la Mina andCueva Chica de la Perra.\\\,'" '~, ,- .... j,'..--.r-,,-! "I\;(r,\ .''- -"'J ~I,----,j/r(r(/c,IMEXICO'","".jI.. ,-'"( r-"'/'_'}... _ ........ v\\'.I..~ II j~ 1_-" >,..J '-~ ._._L~'·I"--, ~ l './//-.......! j'/1 \..-1 IGUATEMALA//\")'-,,-,,\ i\..., i.-'- -----' ,-III/r'r\r',...'..;r/Fig. 60.-Distribution of troglobitic and troglophilic rhachodesmid millipeds of the genus Unculabes: 1, Unculabes causeyae;2, U. columbinus and U. crispus; 3, U. crispus and U. porrensis; 4, U. crispus; 5, U. arganoi.187