464 PROCEEDINGS OF THE ACADEMY OF [1897. 



22. Hypsiglena torquata (Giinth.). 



The Academy's collectors secured a single representative (C. A. S., 

 No. 3,394) of this species at Mazatlan. 



23. Natrix valida (Kenn.). 



One specimen was secured at Tepic in October. 



24. Hapsidophrys diplotropis (Giinth.). 



Two typical specimens of this beautiful snake were obtained at 

 Mazatlan in October. 



25. Sibon punctatum (Peters). 



Dr. Jordan's party secured a single snake of this species at Mazat- 

 lan. Its scale rows are nineteen and its gastrosteges one hundred 

 and fifty-five. 



26. Sibon personatum Cope. 



One snake of this kind was caught at Tepic, Jalisco, in October. 

 It has one hundred and sixty-three gastrosteges, eighty urosteges, 

 and scales in twenty-one rows. 



27. Trimorphodon biscutatus (D. & B.). 



Two specimens from Mazatlan are in the Stanford University 

 collection. They have gastrosteges 249, 250, urosteges 72, 79, scale 

 rows 24, 25. 



