AMERICAN BATS — ^HANDLE Y 137 



Supraorbital region not ridged; extension of temporal ridges into the inter- 

 orbital region variable; temporal ridges normally coalesce to form a sagittal 

 crest (Recent species) 3 



3. Tips of ventral hairs white or whitish, sharply contrasted with blackish bases; 



median postpalatal process triangular in shape, with a broad base; rostrum 

 weak and much depressed; I' with prominent secondary cusp; anterointernal 

 cusp of cingulum of P^ usually present (Southeastern United States). 



P. rafinesquii (p. 151) 

 Tips of ventral hairs brownish or buff, often not sharply contrasted with 

 slate, gray, or brownish bases; median postpalatal process usually styliform, 

 with a narrow base (occasionally triangular) ; rostrum strong and not 

 depressed (east of Great Plains and in Pacific Northwest), or variable; I' 

 with or without secondary cusp; anterointernal cusp of cingulum of P* 

 absent (east of Great Plains), or variable 4 



4. Coloration of dorsum dark sooty-brown, with scant contrast between bases 



and tips of hairs; greatest length of skull usually less than 15.7 mm. (9) 

 or 15.5 mm. (cf); maxillary tooth row usually less than 4.9 mm.; I* usually 

 with secondary cusp; tragus usually less than 13 mm. long; interfemoral 



cross-ribs usually less than 9 (Mexico) P. mexicanus (p. 141) 



Coloration of dorsum (in Mexico) yellow-brown, with sharp contrast between 

 bases and tips of hairs; greatest length of skull usually more than 15.7 mm. 

 (9), or 15.5 mm. (cf); maxillary tooth row usually more than 4.9 mm.; I* 

 usually simple; tragus usually more than 13 mm, long; interfemoral cross- 

 ribs usually more than 9 (Appalachians, Ozarks, western United States, 

 southwestern Canada, Mexico) P. townsendii (p. 165) 



PLEISTOCENE SPECIES 

 Plecotus alleganiensis Gidley and Gazin 



Corynorhinvs alleganiensis Gidley and Gazin, 1933, p. 345. 



Holotype: USNM (Vert. Paleont.) 12412; skull with incomplete 

 dentition and lacking auditory bullae, zygomatic arches, and man- 

 dibles; collected 1912-1915, by J. W. Gidley; Cumberland Cave, 

 Allegany County, Md. 



Distribution: Known only from the Pleistocene fauna of Cumber- 

 land Cave, Md. (fig. 14). 



Description: Skull similar in size and proportions to those of the 

 Recent species P. rafinesquii and P. townsendii, but brain case possibly 

 shallower and wider; supraorbital region slightly ridged; temporal 

 ridges strongly marked, continuous with supraorbital ridges, and 

 converging posteriorly, but not coalescing to form a sagittal crest; 

 dorsal profile of rostrum almost straight; upper dentition (P' — M^ 

 known) appears to be identical to that of Recent material; lower 

 dentition (Ij — M3 known) similar to that of Recent species, but 

 teeth average slightly more robust. 



Measurements: Holotype, in millimeters : Greatest length, 15.9+; 

 interorbital breadth, 3.9; brain case breadth, 8.5; brain case depth, 

 5.5; maxUlary tooth row, 4.9 ±; postpalatal length, 5.9 ±; palatal 

 breadth, 5.9. 



