184 ANIMAL LIFE OF CARLSBAD CAVERN 



evotis from Dow's Cave, near Carlsbad. There is a 

 possibility, however, that this flea may have been in the 

 cloth sack in which the Myotis was carried and have 

 originally come from the guano bats. 



A small bristletail of the thysanuran genus Campodea, 

 probably a new species not yet fully identified, was 

 collected on the floor of the cave near the entrance of 

 Yeitso's Den where all outer light vanishes. These 

 very primitive insects are related to the silverfish or 

 fish moths, well known in dark corners of old houses. 



Five specimens of true spiders, including three spe- 

 cies in three different families were collected in the 

 first large rooms where the bats live. They were on 

 the side walls near the bottom, on the guano-strewn 

 floor, or under old moldy guano sacks. Many old 

 webs showed that the spiders were not rare. The 

 species have since been named and described by C. 

 R. Crosby in the Proceedings of the Entomological 

 Society of Washington. They stand as follows : 



Family Pholcidae, Physoeyclus enaulus Crosby 

 Family Agelenidae, Tegenaria antrias Crosby 

 Family Agriopidae, Pererigone antraca Crosby 



Mr. Crosby says that none of these spiders shows special 

 adaptation to cave life. They were evidently subsist- 

 ing on the decaying vegetable matter which had washed 

 in through the entrance of the cave, and being mixed 

 with the bat guano, formed a slimy ooze in wet places. 

 A tiny crustacean, about a sixteenth of an inch in 

 length, with relatively large pinching claws, somewhat 

 scorpion-like, but still unidentified, was collected on 



