Raymond Bridgman Cowles (pronounced "coals"; 1896–1975) was a herpetologist and professor at University of California, Los Angeles.
 Born in the British Colony of Natal (in what is now KwaZulu-Natal, South Africa) to American missionary parents, he emigrated to the United States in the early 1900s.
 He attended Pomona College as an undergrad and earned his PhD at Cornell University under Albert Hazen Wright.
 He is known for his research on desert ecology and reptile thermoregulation, as well as his popular books on environmental conservation.
 Cowles died of a heart attack in 1975 at the age of 79.
 An obituary called him one of America's first ecologists and conservationists.
 He is commemorated in the scientific names of the White Sands prairie lizard ("Sceloporus cowlesi") and Angolan coral snake ("Aspidelaps lubricus cowlesi").
Sceloporus magister, also known as the desert spiny lizard, is a lizard species of the subfamily Phrynosomatinae, native to the Chihuahuan Desert and Sonoran Desert of North America
The Sonoran Desert is a North American desert which covers large parts of the Southwestern United States in Arizona and California and of Northwestern Mexico in Sonora, Baja California, and Baja California Sur.
 It is the hottest desert in Mexico.
 It has an area of 260000 km2 .
 The western portion of the United States–Mexico border passes through the Sonoran Desert.
The Texas spiny lizard (Sceloporus olivaceus) is a species of phrynosomatid lizard native to the south central United States, in the states of Texas and Oklahoma, and northeastern Mexico in the states of Coahuila, Nuevo León, Tamaulipas, and San Luis Potosí.
 They are quite common throughout their range, where they can be found in trees or on fences.
The southwestern fence lizard ("Sceloporus cowlesi") also known as the White Sands prairie lizard or the White Sands swift is species of spiny lizard native to the Chihuahuan Desert of the southwest United States and north-central Mexico.
 Described in 1956 as "Sceloporus undulatus cowlesi", subspecies of the eastern fence lizard, DNA studies elevated the southwestern fence lizard to species status.
The Chihuahuan Desert is a desert and ecoregion designation covering parts of Mexico and the United States.
 It occupies much of West Texas, parts of the middle and lower Rio Grande Valley and the lower Pecos Valley in New Mexico, and a portion of southeastern Arizona, as well as the central and northern portions of the Mexican Plateau.
 It is bordered on the west by the extensive Sierra Madre Occidental range, along with northwestern lowlands of the Sierra Madre Oriental range.
 On the Mexican side, it covers a large portion of the state of Chihuahua, along with portions of Coahuila, north-eastern Durango, the extreme northern part of Zacatecas, and small western portions of Nuevo León.
 With an area of about 362000 km2 , it is the third largest desert of the Western Hemisphere and the second largest in North America, after the Great Basin Desert.
Sceloporus grammicus is a species of lizard from Mexico and the southern United States.
 It is sometimes referred to as the mesquite lizard or graphic spiny lizard.
Sceloporus merriami, commonly known as the canyon lizard, is a species of phrynosomatid lizard native to the southwestern United States and northern Mexico.
The dunes sagebrush lizard, Sceloporus arenicolus, (formerly known as the sand dune lizard and the dunes-sagebrush lizard, "Sceloporus graciosus arenicolus", a subspecies of sagebrush lizard), is an insectivorous spiny lizard species which only occurs in the shinnery oak sand dune systems of extreme southeast New Mexico and only four counties in adjacent Texas.
 "Sceloporus arenicolus" has the second-smallest range of all lizards in the United States.
U.S. Route 50 (US 50) is a transcontinental highway in the United States, stretching from West Sacramento, California, in the west to Ocean City, Maryland, on the east coast.
 The Nevada portion crosses the center of state and was named The Loneliest Road in America by "Life" magazine in July 1986.
 The name was intended as a pejorative, but Nevada officials seized on it as a marketing slogan.
 The name originates from large desolate areas traversed by the route, with few or no signs of civilization.
 The highway crosses several large desert valleys separated by numerous mountain ranges towering over the valley floors, in what is known as the Basin and Range province of the Great Basin.

Question: What large desert in Mexico and the United States is home to the Sceloporus magister?
Answer: Chihuahuan Desert