104 PROCEEDINGS OF THE ACADEMY OF [Jan., 



suboculars aud labials; scales in 27-25 rows; ventrals 173-187; 

 subcaudals 23-28. Of many specimens the largest I have seen 

 measured 1,670 mm. 



Yellowish or grayish, sometimes quite brown, with a series of 

 dark brown or black dorsal spots, with centres of the body color; 

 the angles of the spots are not sharp as in adamanteus, but are cut 

 off, forming irregular hexagons; the lateral markings are indis- 

 tinct; tail gray or Avhite, with 3-5 dark brown or black half- 

 rings; belly yellowish, more or less clouded on the sides. The 

 oblique streak behind the eye is present, but the light line in front 

 of the nasal is always absent. Some young examples have a nar- 

 row light line across the middle of supraoculars. 



Hab. — Central Texas to Arizona; northern Mexico. 

 Crotalus atrox ruber Cope. 



I. c, 690 ; a confluentiis (part) Boul., I. c, III, 576 ; O. a. ru&er Stvj., 

 I. c, 439 ; G. ruber, Van Den., I. c, 222 ; Cope, Rep. Nat. Mus., 

 1167, 



Size smaller than C. a. atrox ; rostral wider; canthus less dis- 

 tinct; head scales small ; 8 rows between supraoculars; 5 between 

 suboculars and labials; 27 rows of scales; ventrals 183-186; 

 subcaudals 22-26. 



Length about 1,300 mm. 



Pale red; dorsal spots darker red; lateral spots and head mark- 

 ings indistinct, although a specimen from San Diego, formerly 

 living in the Zoological Gardens, plainly showed the oblique streak 

 behind the eye; belly yellowish; tail whitish with black cross- 

 bauds. 



Hab. — Southern California. 



A better acquaintance with this rare snake may require that it 

 be given specific rank, especially as Mr. Van Denburg does not 

 include C. a. atrox in his list of (California snakes. 



Crotalus confluentus Say. 



Long's Exp., II, 48 (1823); B. and G., I. c, 8 ; 0. c. confluentus and 

 G. c. puhernlentus Cope, I. r., 696, and Rep. Nat. Mus., 1170, 

 1174; G. coti-ffi/entiis (part) Boul., I.e., 111,576; G. confluentus 

 Stej., I. c, 440. 



Body rather slender; rostral higher than wide; no very distinctly 

 enlarged plates behind the nasals; head scales of moderate size, 

 3-6 between supraoculars, 2-4 between suboculars and labials; 

 27-29 rows of scales; ventrals 173-188; subcaudals 23-28. 



Length about 1,400 mm. 



