Although we know very little of the ethology of most of the cavernicolous cockroaches, it is intriguing that three of the six known species of _Nocticola_ are cave dwellers, two are inhabitants of termite nests (p. 315), and one (_N. bolivari_) was found under stones and cement blocks (Chopard, 1950b). In the rather extensive list of cavernicolous cockroaches only two (_Arenivaga grata_ and _Parcoblatta_ sp.) were taken from caves in North America north of Yucatan. All other records are from Africa, Asia, Central America, Europe, West Indies, East Indies, and the Philippine Islands. This we find puzzling. Packard (1888) in his extensive study of the cave fauna of North America listed no cockroaches. Dearolf (1941) found only the above-mentioned _Parcoblatta_ in one of 37 caves in Pennsylvania. Kohls and Jellison (1948) listed no cockroaches among the arthropods from six bat caves in Texas. We would expect _Periplaneta americana_ to inhabit mines in North America, but we have found no such records. Have cockroaches been ignored in fauna collections from North American caves, or has our cave fauna been less extensively studied than that of other parts of the world? The two species of cockroaches found in mines (_Blattella germanica_ and _Periplaneta americana_) are also found in caves. For this reason we have included them in the list headed Cavernicolous Cockroaches. On the other hand, the cockroaches found in animal burrows are generally different species from those found in caves, so we have grouped these together in a second list. CAVERNICOLOUS COCKROACHES =Alluaudellina cavernicola= _Tanganyika._--From Kulumusi caves, near Tanga. The eyes of this cockroach are reduced to a pair of slender streaks (Shelford, 1910a; Chopard, 1932a). _East Africa._--Chopard (1936). =Apotrogia angolensis= _Belgian Congo._--A troglophile without well-marked adaptive characters. Collected in moist sand on floor of a sandstone grotto inhabited by bats (Chopard, 1927, 1950a). Taken in many caves in Bas Congo (Leleup, 1956). =Apteroblatta perplexa= _East Africa._--Accidental inhabitant of cave (Chopard, 1936). =Arenivaga grata= _Arizona._--"A female and many nymphs were taken by Flock in the guano in a bat cave in the Tucson Mountains" (Ball et al., 1942). =Aspiduchus borinquen= _Puerto Rico._--In limestone cavern by thousands in grass and on walls (Rehn and Hebard, 1927; Rehn, J. W. H., 1951a). =Aspiduchus cavernicola= _Puerto Rico._--In limestone cave, in caves inhabited by bats, and apparently seen in other caves well removed from entrance. "In this latter situation great numbers were seen on the side walls and roof" (Rehn, J. W. H., 1951a). =Blaberus atropos= _Yucatan._--Found once, in Xmahit cave (Pearse, 1938). =Blaberus craniifer= _Yucatan._--Collected within three caves, near the entrances (Pearse, 1938). =Blaberus giganteus=