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known from caves all contain troglobites and are discussedbelow.Aceratophallus scutigeroides ShearAceratophallus scutigeroides Shear, 1974:263, 269,271, fig. 50-54.Type-locality.-Cueva Sepacuite n. 1 and CuevaSepacuite n. 2, Finca Sepacuite, Senahli, Alta Verapaz,Guatemala.Distribution.~Known from two caves in AltaVerapaz, Guatemala, and possibly one in Chiapas,Mexico. See Fig. 58.Records.-GUATEMALA: Alta Verapaz: CuevaSepacuite n. 1 and Cueva Sepacuite n. 2; MEXICO:Chinpas: ?Cueva del Arco.Discussion.-The genus Aceratophallus rangesnorth into Chiapas and Yucatan. Several cave specieshave been described from Yucatan, but none are obvioustroglobites. The single female from Chiapas iseither A. scutigeroides or a closely related undescribedspecies. This species is in some ways similar toUnculabes arganoi Shear, and it may eventually benecessary to rearrange the species in several generaof the Rhachodesmidae.GUATEMALA/.//..... r r ,.-"Fig. S8.-Distribution of troglobitic and troglophilic rhachodesmid millipeds of the genera Ceuthauxus, Pararhachistes,Acutangulus, Rhachodesmus, and Aceratophallus: 1, Ceuthauxus palmitonus; 2, C. mediator; 3, C. galeanae; 4, C. constans;5, Pararhachistes amblus; 6, Acutangulus alius; 7, Acutangulus pictus; 8, Rhachodesmus viridis; 9, R. digitatus; 10, Aceratophallusscutigeroides; n, Aceratophallus calcehtokanus; 12, Aceratophallus oxkutzcabus; 13, Aceratophallus hoctunanus.184