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epresented by many species. Tenebrionids are usuallyfound in the drier parts of caves, frequently asguanophiles. Many species have been identified andsome await description. Large collections remainundetermined, and the number of identified tenebrionidspecies will doubtless increase with furtherstudy. Alphitobius laevigatus (Fabricius) is a commonguanophile in caves in Coahuila, San Luis Potosi,and Tamaulipas. Cryptoglossa mexicana mexicanaChampion is abundant in the caves of northernand western Mexico. It is known from dry, dustycaves in Chihuahua, Coahuila, Durango, and NuevoLeon. The genus Eleodes is the most commonly collectedgenus of tenebrionid in Mexico. Althoughusually found as guanophiles, they are also takenin dry dusty areas of many caves not inhabited bybats. Most collections of this genus await study, buta few species have been identified. Eleodes glabricollisChampion has been found in gypsum cavessouth of Galeana, Nuevo Leon. Eleodes rugosa Perboseis frequently found in the drier area of caves inthe Sierra de EI Ahra, San Luis Potosi and Tamaulipas.Eleodes sallei Champion has been found in manycaves at higher elevations in the Sierra Madre Orientalin San Luis Potosi and Queretaro and in Oaxaca. Eleodeshispilabris (Say), a common guanophile in Texascaves, has been collected from Cueva de los Lagos,Coahuila. Eleodes spinolai Solier has been collected inGUATEMALAFig. S3.-Distribution of troglophilic beetles of the families Staphylinidae and Scydmaenidae: 1, Stilieolina n. sp.; 2, Stilieolinan. sp. and Stenopholea reddelli; 3, Seydmaenul teapanw; 4, Eueonnul (MadagtUloeonnul) arganoi.232