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Calymmodesmus inquinatus Causey was describedfrom Gruta del Silvino, Izabal, Guatemala (Causey,1960); it is also known from Cueva de Yaxchilan,EI Peten, Guatemala. Calymmodesmus alienus (Chamberlin),C. isidricus (Chamberlin), C. muruztunicus(Chamberlin), C. viabilis (Chamberlin), and C.hoctunanus (Causey) are all known only from cavesin Yucatan (Chamberlin, 1938; Causey, 1971b).Shear (1974) described two species of Cryptymafrom caves in Mexico and Guatemala (see Fig. 57).Cryptyma cocona is known only from Grutas delCocona, Tabasco; and C. guatemala has been foundin three caves in Alta Verapaz, Guatemala.The genus Rettenmeyeria is represented in cavesonly by R. cryptymoides Shear. It was described byShear (1977a) from Rio Frio Cave A, Belize (seeFig. 57). Other species of this genus are myrmecophiles.Lophodesmus includes six species known fromcaves in Chiapas and Guatemala (see Fig. 57). Shear(1974) described 1. italolegatus from Cueva de laGolondrina, Chiapas; it is now known from two additionalcaves in Chiapas and from four in Yucatan.Lophodesmus tioticho Shear is known from threecaves in Chiapas (Shear, 1974). Causey (1977) consideredthe American "Lophodesmus" to belong toGUATEMALA.....-'/.//r\,"Fig. 55.-Distribution of eight species of troglophilic pyrgodesmid milliped of the genus Myrmecodesmus: 1, Myrmecodesmusilymoides; 2, M. egenus; 3, M. cornutus and M. errabundus; 4, M. errabundus; 5, M. monasticus; 6, M. amarus; 7, M.aconus; 8, M. clarus.181