ACARINA TYROGLYPHID^. 69 



latens, I did not observe this mite upon any other species, although several 

 other Diptera mingled with L. latens and to such an extent that several 

 species are often taken near the same spot. Dozens of Leria defessa, 

 Limosina tenebrarum, and other species were closely examined without 

 finding a single one of these parasites. 



Family GAMASIDAE. 



Two or three times bats were seen with large mites, possibly of the 

 family Gamasidae, clinging to them. The mites were fastened to the 

 naked portions about the head of the bat, and in one case the mite's 

 abdomen was greatly distended and red from the blood it contained. 



Carpenter (1895, 30) found Gamasus attenatus, a common British 

 form, among dead leaves, etc., in Michelstown Cave. Absolon (1900, 3) 

 mentions 9 blind Gamasida?. By experiment he found that Gamasus 

 niveus dies in a few minutes on exposure to daylight (1900, 4). 



Hamann (1896, 215-223) lists 19 Acarina from European caves, 

 some of which are blind and without pigment. 



CRUSTACEA. 

 Order PODOPTHALMATA. 



Family ASTACIDAE. 

 Cambarus pellucidus testii Hay. 



Cambarus pellucidus, PACKARD, Mem. Nat. Acad. Sci., IV, 1888, 16 (May field's Cave). 



FAXON, Proc. U. S. Nat. Mus., xn, 1890, 621 (Mayfield's Cave). 

 Cambarus pellucidus testii, HAY, Proc. U. S. Nat. Mus., xvi, 1893, 283, fig. (Mayfield's 



and Truett's Caves) ; Rep. Ind. Geol. Survey, XX, 1895, 484; the same, xxi, 1896, 



209 (Mayfield's Cave). HARRIS, Kan. Univ. Sci. Bull., n, 1903, 112 (localities as 



above) . 



This subspecies of Cambarus pellucidus (Tellkampf ) * was described 

 by W. P. Hay, who bases the distinction principally upon the smoothness 

 (lack of spines) of the individuals from Mayfield's Cave as compared 

 with specimens from the more southern Indiana and from the Kentucky 

 caves. The subspecies is known from this cave and Truett's Cave only, 

 while the parent form is known from most of the Indiana and Kentucky 

 caves in which there are pools or streams. It is quite abundant in the 

 pools of Mayfield's Cave. 



The subspecies is not clearly defined. All the specimens of Cambarus 

 pellucidus from Kentucky which I have seen have the spines on the 

 rostrum well developed and the tendency to spininess on the side of the 



*Cambarus pellucidus was described as Astacus pellucidus Tellkampf, Arch. 

 Anat., Physiol. u. Wissensch. Med., 1844, 383 (Mammoth Cave). 



