1955] 
Creighton — Distribution of Novomessor 
91 
Novomessor cockerelli : 
Nevada: 9 miles north of Searchlight (3200'). 
Texas: Palo Duro Canyon (3000'). 
Arizona: Whetstone Mountains, Dry Canyon (5000') ; 
Plains west of the Baboquivari Mountains (3000') ; 
Organpipe Cactus National Monument, Headquar- 
ters (1600'), Dripping Springs (1700'), Quito- 
baquito (900') ; 25 miles east of Douglas (4000') ; 
20 miles east of Gila Bend (2700') ; 8 miles north 
of Casa Grande (1300') ; 7 miles east of Aguila 
(2200') ; Safford (3000') ; 15 miles north of Wilcox 
(4100'). 
Sonora: 3 and 8 miles south of Sasabe (3400') ; 2 and 
10 miles south of Sonoita (1300', 1400') ; Campamto 
(1400') ; Santa Ana and five miles south of Santa 
Ana (2500') ; 6 miles south of Imuris (3200') ; 10 
miles south of Hermosillo (700'). 
Chihuahua: Plains east of the Sierra de en Medio 
(4700') ; El Pueblito (4900') ; 6 miles south of Gal- 
lego (5100') ; 5 miles north of Ojo Laguna (4800') ; 
7 miles north of Chihuahua City (4700') ; Jiminez 
(4300') ; 2, 34 and 38 miles south of Parral (5500- 
5800'). 
Coahuila : Nava (1000'); 20 miles north of Saltillo 
(4000') ; Sierra de la Paila (4800') ; 22 miles west 
of Saltillo (5000'). 
Durango: 12 miles south of Villa Ocampo (5600') ; 17 
miles south of Rodeo (5500') ; 5 and 6 miles east of 
San Lucas (6100') ; 17 miles south of Durango City 
(6400'). 
Zacatecas: 30 miles east of Sombrerete (6900'). 
The table below shows the relationship of latitude to 
elevational range in the two species. It is based on the 
records just given plus about thirty older ones for which 
elevational data was available or could be assigned with 
