1974J 
Coyle — Genus Aliatypus 
451 
Coloma-Aukum population are great enough to indicate that repro- 
ductive isolation would develop if the populations were brought to- 
gether. The recent discovery in the Sutter Buttes area of the Central 
Valley of a moderately large immature female A. calif ornicus (Fig. 
126) supports this conclusion by suggesting that gene flow could 
have occurred rather recently across the Central Valley. 
The female sample from Mariposa is quite divergent from all other 
A. calif ornicus samples. However, without an analysis of more and 
larger Sierran samples, I am reluctant to conclude that this Mari- 
posa population is a different species. It is possible but unlikely that 
this Mariposa female sample is conspecific with A. janus. The com- 
puter analysis shows that this sample is more similar to A. janus 
than to the rest of the entire A. calif ornicus sample. If this popula- 
tion is conspecific with A. janus, its variation patterns shown in 
Figures 13-15 could be the result of character displacement with the 
sympatric A. calif ornicus population. However, the collection of 
three A. calif ornicus males in the same location with the Mariposa 
females argues strongly against this possibility. 
Distribution. Mountains and foothills of the San Francisco Bay 
region, western foothills of the Sierra Nevada Mountains, and at 
least one area in the Central Valley (Map 2). 
Records. California, coastal populations: Contra Costa Co.: 
0.5 mi. E of South Gate of Mt. Diablo St. Pk., 1300 ft., 3$. — 
Orinda Village. San Mateo Co.: Butano State Park, 9 . — Huddart 
Park, 9 • Santa Clara Co.: Montebello Rd., 4 mi. W of junc. with 
Stevens Canyon Rd., 2300 ft., 10 Oct. 1971, cT, 9 * — Mt. Loma 
Prieta, 9 mi. W of Morgan Hill, 1800 ft., 10 Oct. 1970, cf, 4$- 
— Marsh Rd., 0.5 mi. S of Calaveras Reservoir, 900 ft., 7 Oct. 
1970, 2 cf j 3 ? . — Alum Rock Park, 600 ft., 11 Oct. 1970, cf , 9 ; 
23 Oct. 1970, cf, 39 ; 79 - Santa Cruz Co.: 4.5 mi. N of Soquel 
Center, 300 ft., 12 Oct. 1971, cf, 49 ; 29 - — Bates Creek, 3 mi. 
NE of Soquel, 200 ft., 3 9 • — Henry Cowell St. Pk., Redwood 
Loop Nature Trail, 250 ft., 9 • — 1.7 mi. W of Felton on Felton 
Empire Rd., 1000 ft., 9 * — 4-3 mi • W of Felton on Ice Cream 
Grade Rd., 1600 ft. sierran populations: El Dorado Co.: Omo 
Ranch Rd., 1.5 mi. NE of Aukum, 2200 ft., 9 Nov. 1972, cf , 29 • 
— 0.5 mi. SE of Coloma, 750 ft., 8 Nov. 1972, 3 cf » 9 • Mariposa 
Co.: 0.5 mi. NW of Mariposa on rt. 49, 2000 ft., 14 Oct. 1969, 
(cf ), 9 ; 8 Oct. 1971, 2 cf , 39 ; 29* central valley popula- 
tion: Sutter Co.: Moore Canyon of Sutter Buttes, 4.5 mi. NW of 
Sutter, 200 ft. 
