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troglobites, only two of which are unquestionablysuch. The remaining three, Aceratophallus calcehtokanus,A. hoctunanus, and A. oxkutzcabus were describedby Chamberlin (1938) from caves in Yucatan(see Fig. 58). These three species are of uncertainecological status. The only unquestioned troglobite inthis genus, A. scutigeroides Shear, is listed below.The genus Rhachodesmus is represented in Mexicancaves by two species (Causey, 1973): R. digitatusCausey is an apparent troglophile from caves nearHuautla de Jimenez, Oaxaca; R. viridis (Saussure) ispresumably an accidental in Cueva del Ojo de AguaGrande, Veracruz (see Fig. 58).Two other genera of rhachodesmid are representedin Mexican caves by species which have probablybeen accidentally introduced into the caves. Rhachidomorphaadunca (Saussure and Humbert) is knownonly from Sotano del Relicario, Veracruz; and Tiphallusfrivolus Causey has been collected only inCuevacita de Nopales, San Luis PotosI (Causey,1973).The remaining four genera of rhachodesmidsMEXICOGUATEMALA·~~2 ,. 11~/(\....."...;0Fig. 57.-Distribution of troglophilic pyrgodesmid millipeds of the genera Cryptyma, Lophodesmus, Calymmodesmus, andRettenmeyeria: 1, Cryptyma eoeona; 2, Lophodesmus italolegatus; 3, L. italolegatus and L. rodriguez:i; 4, L. tiotieho; 5, L.z:ullinii; 6, Calymmodesmus isidricus and Calymmodesmus viabilis; 7, Calymmodesmus viabilis; 8, Calymmodesmus hoetunanus;9, Calymmodesmus alienus; 10, Calymmodesmus mUTUz:tunieus; 11, Calymmodesmus inquinatus; 12, Cryptyma guatemala;13, Rettenmeyeria eryptymoides.183