846 13. COLUBRID 
faint occipital spot. The sides of the head are dusky yel- 
lowish, with vertical blackish marginings to the supralabials. 
Length to anus.___._____.. 304 382 440 500 670 870 
Length of tail... 93 109 120 143 180 275 
V ariation.—The loreal in seventy-five specimens is 1—1 
in all. Preoculars 2—2 in thirty-one, or 42%; 1—1 in 
twenty-seven, or 36%; 2—1 in thirteen, or 18%; 3—3 in 
two, or 3% 3 and 2—3 in one, or 1%. Postoculars 3—3 in 
sixty-six, or 92%; 3—4 in three, or 4%; 4—4 in two, or 
3%; and 3—2 in one, or 1%. Temporals 1+2—1+2 in 
forty-two, or 56%; 1+2—1+3 in twenty-one, or 28%; 
1+3—1-+3 in twelve, or 16%. The supralabials are 8—8 
in all except one specimen which has 8—9. The infralabials 
are 10—10 in sixty-nine, or 92%; 10—9 in three, or 4%; 
9—9 in two, or 3% 3 and 10—11 in one, or 1%. The scale- 
rows are 21—21—17 in sixty-two, or 83%; 21—19—17 
in eleven, or 15%; 19—21—17 in one, or 1%; and 19— 
19—17 in one, or 1%. The gastrosteges vary from 156 to 
173, males having from 163 to 173, females from 156 to 
171; the average in thirty-seven males is 168.1, in thirty- 
four females, 162.6. The urosteges vary from 67 to 88, 
males having from 69 to 88, females from 67 to 82; the 
average in twenty-five males is 81.2, in twenty-one females, 
Te 
Distribution——This subspecies is the common water- 
snake of southern California west of the deserts. Where 
streams run from the western mountains down onto the 
desert this snake may follow them for some distance, as, 
to Victorville on the Mohave River, and Palm Canyon at 
the eastern base of the San Jacinto Mountains. It ranges 
at least from sea level to an altitude of 8,000 feet. The 
most northern locality from which we have seen a typical 
