1974 ] 
Coyle — Genus Aliatypus 
473 
Miramonte specimens a bit lighter, and all other specimens noticeably 
lighter than these. Variation in seminal receptacle form (Figs. 174- 
187) is continuous with no divergent populations. Bulb size and 
stalk diameter seem to be the most variable aspects of seminal re- 
ceptacle form. 
More and larger samples are needed before firm conclusions can 
be made about the genetic relationships of these populations. I feel 
that the best working hypothesis suggested by this analysis of varia- 
tion is that the Mt. Diablo, Wilbur Springs, and Nevada City popu- 
lations are, because of distance and ecological barriers to gene flow, 
markedly different genetically from the south Sierra populations, but 
that this isolation is either incomplete or has not been of long 
enough duration for reproductive isolating mechanisms to develop. 
A thorough search for more populations is especially needed in central 
and northern California in the eastern part of the Coast Range, the 
Central Valley, and the western foothills of the Sierra Nevada 
Mountains. 
Distribution. Eastern edge of the Coast Range in central Cali- 
fornia and western slope of the Sierra Nevada Mountains (Map 4). 
Records. California. Butte Co.: 16 mi. E of Oroville on Lump- 
kin Rd., 1300 ft., $. Colusa Co.: 3 mi. SE of Wilbur Spgs. on 
Bear Cr. Rd., 1250 ft., 2 9 - Contra Costa Co.: south side of Mt. 
Diablo, Fossil Ridge, 31 Oct.-6 Nov. 1970, cf ; 24 N0V.-5 Dec. 
1970, 2 cf \ 5 Dec. 1970-20 Feb. 1971, cf. —0.5 mi. E o'f South 
Gate of Mt. Diablo St. Pk., 1300 ft'., 2$. Fresno Co.: Shaver 
Lake, 2$. — Hwy. 168, 1.5 mi. S of Dinkey Cr. Rd., near Shaver 
Lake, 5400 ft., 9 • — Hwy. 245, 1 mi. E of Pinehurst, 4500 ft.. 
3 9 - — Mt. Miramonte, 9 * Mariposa Co.: 0.5 mi. NW of Mari- 
posa along Hwy. 49, 2000 ft., 89 - Nevada Co.: Hwy. 49, 10.7 
mi. S of Grass Valley, 1300 ft. — Hwy. 20, 2 mi. NE of Nevada 
City, 3000 ft., 2 9 - Tuolumne Co.: Draper Mine Rd., 6 mi. E of 
Sonora, 2700 ft., 39 - — probably near Sonora, summer 1968, cf- 
Aliatypus plutonis new species 
Figures 63, 76, 89-90, 94, 117-118, 188-191. Map 4. 
Type specimens and etymology. Holotype male from University of 
California at Riverside campus, Riverside Co., California, 31 Octo- 
ber 1968 (W. R. Icenogle). One male and four female paratypes. 
The specific name is the genitive of Pluto, the Latin god of the 
nether world. 
Diagnosis. Males: A. plutonis can be distinguished best from 
closely related and sympatric A. torridus by pedipalp and palpus 
