vigilis and a few other species from the desert tracts of Nevada and California to Lower California.
Chirotes canaliculatus, and two other species; Pacific side of Mexico and Lower California.
below the mouth of the Gila river, thence northward to the mouth of the Gila, and thence, nearly due W., along the old line between Upper and Lower California to a point on the Pacific coast one marine league S.
The peninsula of Lower California (q.v.) lies parallel with the mainland coast and extends southward to about 22° 52' S.
The peninsula of Lower California is traversed from north to south by a chain of barren mountains which covers the greater part of its surface.