. Bulletin. Science. CALIFORNIA GILA MONSTERS 55 40 r. 119 118 117 116 115 Longitude (degrees) 114 Fig. 10. The relationship between longitude (x-axis from west to east) and the percentage of annual rainfall occurring in the months from June-September in the Mojave and Colorado Deserts, California. From Rowlands (1995) but does not include the high altitude White Mountains record. Data are from the Department of Commerce, Weather Bureau (1945-75, 1952, 1958, 1964 [sic]). occurs in the summer (defined by Rowlands as June-September). All known Gila monster records in California occur east o
. Bulletin. Science. CALIFORNIA GILA MONSTERS 55 40 r. 119 118 117 116 115 Longitude (degrees) 114 Fig. 10. The relationship between longitude (x-axis from west to east) and the percentage of annual rainfall occurring in the months from June-September in the Mojave and Colorado Deserts, California. From Rowlands (1995) but does not include the high altitude White Mountains record. Data are from the Department of Commerce, Weather Bureau (1945-75, 1952, 1958, 1964 [sic]). occurs in the summer (defined by Rowlands as June-September). All known Gila monster records in California occur east of about 116° longitude, except for the specimen from the Mojave River. According to the relationship portrayed in Fig- ure 10, this corresponds to areas receiving greater than 24% of the total annual precipitation between June and September. Using Rowland's data, and selecting the recording stations closest to the Gila monster records listed in Table 1 (Eagle Mountain - , Imperial - 26%, Blythe - , Iron Mountain - , Mitchell Caverns - , Mountain Pass - , Needles - ) shows that the mean summer precipitation at these locales account for percent of the annual total, which is close to the mean value of for western Arizona reported above (Rowlands 1995). Beck (2005) reported that Gila monsters are "conspicuously absent" from areas where summer precipitation is less than 25% of annual precipitation, which fits our model of distribution in the Mojave Desert of California very Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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