416 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4TH SER. 
61.—Bascanion flagellum frenatum Stejneger 
The collection includes specimens from Yuma, from Papago 
Wells close to the southeastern corner of Yuma County, and 
from Cave Creek, Maricopa County. 
No. 34203, Papago Wells, has scale rows 17, gastrosteges 
192, anal divided, urosteges 110, supralabials 8-8, infralabials 
10-11, preoculars 2-2, postoculars 2-2, temporals 2-+-2-+-2, 
loreal 1-1, posterior genials longer. 
No. 17549, Cave Creek, has scale rows 17, gastrosteges 191, 
anal divided, urosteges 102, supralabials 8-8, infralabials 10- _ 
10, preoculars 1-2, postoculars 2-2, temporals 2+-2-+2, loreal 
1-1, posterior genials longer. 
No. 30672, Yuma, Oct. 22, 1911, has scale rows 17, gas- 
trosteges 199, anal divided, urosteges 105, supralabials 8-8, in- 
fralabials 10-10, preoculars 1-1, postoculars 2-2, temporals 
2+2-+2, loreal 1-1, posterior genials longer. 
No. 30673, Yuma, Oct. 22, 1911, has scale rows 17,. gas- 
trosteges 194, anal divided, urosteges 35+, supralabials 8-8, 
infralabials 10-10, preoculars 1-1, postoculars 2—2, temporals 
2+2-+-2, loreal 1-1, posterior genials longer. 
62.—Bascanion piceum Cope 
Two specimens were captured in the bed of the Santa Cruz 
_ River near Tucson, May 29, 1912, and one was seen near the 
steam pump eighteen miles north of Tucson, and a fourth 
specimen was found dead in the central part of Pima county. 
The specimens caught May 29, 1912, were apparently mat- 
ing. They were lying on the sand at full length but entwined. 
When disturbed they immediately separated and instantly 
mounted to the top of a willow tree some twenty feet high, 
where they were captured with much difficulty. Both were jet 
black with the lower surfaces a beautiful coral pink. The fact 
that these two black snakes were mating is very interesting, 
since it would seem to indicate that they may really represent a 
distinct species rather than a melanistic phase of Bascanion 
flagellum frenatum. 
In addition to the above localities these black racers have 
been taken at Fort Lowell and at Camp Grant, Arizona, and 
near Ensenada, Lower California. 
