...The depths to which cottonmouths penetrate into their dens may have a limiting influence upon the geographic range, especially in the northern extremes... 
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...The correlation between antigenic composition and geographic range in the Old and New World of some species of Columba...
William B. Stallcup 「Myology and Serology of the Avian Family Fringillidae」
...Comments on the taxonomy and geographic distribution of some North American rodents...
William B. Stallcup 「Myology and Serology of the Avian Family Fringillidae」
...This funnel-eared species occupies an extensive geographic range(northern México to Brazil) but appears to be relatively rare in MiddleAmerica to the south of Guatemala...
J. Knox Jones 「Noteworthy Records of Bats From Nicaragua, with a Checklist of the Chiropteran Fauna of the Country」
...This small vespertilionid occurs throughout much of Central America,but the available material still is insufficient to permit an accurateassessment of geographic variation in that region...
J. Knox Jones 「Noteworthy Records of Bats From Nicaragua, with a Checklist of the Chiropteran Fauna of the Country」
...No noticeable geographic trends in size and proportions are evident...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...—For the purposes of analyzing geographic variationin size and proportions, measurements were taken on ten adult males fromeach of five samples throughout the range of the species...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...The rather striking differences in size among certain samples and the minordifferences in proportions among other samples show no geographic trends...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...Little geographic variation in color or pattern is evident...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...There is a geographic gradientin size; specimens from the western part of the range (southern Costa Rica)are smaller than those from the eastern part of the range (eastern Panamá)...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...Superimposed on this geographic variation are ontogenetic changes, whichare most noticeable in males...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...baudini, which has a broad geographic range, including a variety of habitats...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...Thedata are insufficient to determine geographic variation in the calls and to determineif differences in the calls are enhanced in areas of sympatry as comparedwith the allopatric parts of the ranges...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...Variations of this kind are spoken of as geographic, racial, or subspecificand the birds exhibiting them are termed subspecies...
Frank M. Chapman 「Color Key to North American Birds」
...Some mammals that passed throughTamaulipas into Texas have extended their geographic ranges far northof Texas...
Ticul Alvarez 「The Recent Mammals of Tamaulipas, Mexico」
...One is a pup from the vicinity ofPadilla which is assigned to this subspecies on geographic grounds...
Ticul Alvarez 「The Recent Mammals of Tamaulipas, Mexico」
...Mayr (1946:28-29) gave examples of analysis by geographic origin of the breeding species of several districts of North America...
Emil K. Urban 「Birds from Coahuila, Mexico」
...minor (Brehm), on geographic grounds, probably nestedhere, but five other subspecies have been recorded in the State andany one of these might have undertaken the aberrant breeding...
Richard F. Johnston 「The Breeding Birds of Kansas」
...Paynter (1955a) discussed in detail the contradictions in the literature concerning the geographic range of this subspecies, and referred a male in his collection taken in February, 1952, toC...
Erwin E. Klaas 「Summer Birds From the Yucatan Peninsula」
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