Proceedings of the United States National Museum . Figure 23.—Distribution of Plecotus townsendii Cooper (eastern section): 1, P. i. ingens;2, P. t. virginianus. Solid symbols, specimens examined; open symbols, other records;encircled symbols, type localities. Cross-hatching indicates known areas of intergrada-tion between subspecies ingens and pallescens. Comparisons: P. t. australis is most similar to P. t. pallescens, butaverages darker, browner, and less cinnamon dorsally. P. t. australisaverages larger in most cranial dimensions than Arizonan P. t. pal-lescens, but can be scarcely disting
Proceedings of the United States National Museum . Figure 23.—Distribution of Plecotus townsendii Cooper (eastern section): 1, P. i. ingens;2, P. t. virginianus. Solid symbols, specimens examined; open symbols, other records;encircled symbols, type localities. Cross-hatching indicates known areas of intergrada-tion between subspecies ingens and pallescens. Comparisons: P. t. australis is most similar to P. t. pallescens, butaverages darker, browner, and less cinnamon dorsally. P. t. australisaverages larger in most cranial dimensions than Arizonan P. t. pal-lescens, but can be scarcely distinguished cranially from other popula-tions of P. t. pallescens. For comparison with P. mexicanus, see account of that species. Remarks: Mexican populations of P. townsendii are relatively uni-form in coloration and cranial characters despite the wide range oflatitude and elevation inhabited. The greatest divergence noted is inspecimens from San Andres, Jalisco, in which the rostrum is unusually 188 PROCEEDINGS OF THE NATIONAL MUSEUM. Figure 24.—Distribution of Plecotus townsendii Cooper (southern section): \, australis;2, P. t. ingens; 3, P. t. pallescens. Solid symbols, specimens examined; open symbols,other records; encircled symbols, type localities. Cross-hatching indicates known areasof intergradation between subspecies (between pallescens and ingens in northern Texas,Oklahoma, and Kansas; between pallescens and australis in western Texas, Chihuahua,and Coahuila). broad and inflated. Indeed, the whole skull is broad (reflected inzygomatic breadth, breadth of brain case, etc.) in those specimens. P. t. australis intergrades with P. t. pallescens. Samples from south-ern Coahuila have the coloration of P. t. australis. Two specimensfrom near San Buenaventura in central Coahuila resemble P. t. pal-lescens, whereas one from the Chisos Mountains, Texas, is very similarto P. t. australis. Other specimens from the Big Bend region of Texasand Chihuahua are, on the average, s
Size: 1465px × 1706px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
