very few in number, so that no conclusions as to the 

 cause of the variations in the gestation period have 

 been reached. It is certain, however, that there are 

 variations, and it is planned to investigate the influ- 

 ence of temperature by keeping the pregnant females 

 in constant temperature rooms. 



Alexander G. Rtjthven, 



Ann Arbor, Mich. 



LOS ANGELES SNAKES. 



The following snakes were observed within one- 

 half day's walk of the city of Los Angeles during the 

 years 1913 and 1914: 



1. — Kosy Boa, Lachinura roseofusca. (Cope) 

 2. — Pacific Bull Snake, Pituopliis catenifer. 



(Blainville) 

 3.— Boyle's King Snake, Ophibolus getulus boy- 



Lii. (Baird & Girard) 

 4. — Coral King Snake, Ophibolus zonatus. 



(Blainville) 

 5. — Red Racer, Zamenis flagelliformis frenatus* 



(Stejneger) 

 6. — Blue Racer, Zamenis constrictor flaviventiis. 



(Say) 

 7. — Striped Racer, Zamenis laterale. 



(Hallowell) 

 8. — Western Garter Snake, Thamnophis parie- 



talis. (Say) 

 9. — Pacific Garter Snake, or "Water-snake," 

 Thamnophis hammondi. (Kennicott) 

 10. — Patch-nosed Snake, Salvadora grahamiae. 



(Baird & Girard) 

 11, — Western Ring-neck Snake, Diadophis ama- 



bilis. (Baird & Girard) 

 12. — *Rock Snake, Hypsiglena ochroryncha. 



(Cope) 

 13. — *Tantilla, Tantilla eiseni. (Stejneger) 

 14. — Pacific Rattlesnake, Crotalus oregonus. 



(Golbrook) 



* Hitherto unrecorded from this locality. 



Paul Ruthling, 



Los Angeles, Cal. 



Edited by J. T. Nichols, American Museum of Natural History 

 PRICE FIVE CENTS 



