100 rROCEEDINGS OF THE ACADEMY OF [Jan., 



original description. The Zoological Society has lately received a 

 living Slstrurus from Port Lavaca, Calhoun county, Tex , practi- 

 cally the type locality of consors, which agrees with Baird and 

 Girard's description of that species in all respects, as well as with 

 Garman's Matagorda specimens. It has 25 rows of scales, the two 

 outer, smooth; 53 dorsal blotches (45 on the body and 8 on the 

 tail); ventralg 153; subcaudals 27; length 520 mm, (tail 70). 

 There is no large loreal and the preocular is in full contact with 

 the post-nasal. As edwardsi is known to sometimes present 25 

 scale rows, there is nothing to separate the two forms except an 

 insignificant difference in the number of spots. Regarding them as 

 identical, the name consors has priority. 



Hab. — Indian Territory to northern Mexico; west to Arizona. 



Sistrurus millarius L. 



Crotnlus miliarius, L., Syst. Nat., Ed. XII, 372 ; Croialophorus mili- 

 arius B. and G., I. c,, 11 ; Cope, L c, 685 ; Sistrurus miliarius Boul., 

 I. c, III, 569; Stej., I. c, 418; Sistncriis miliarus, Cope, Rep. Nat. 

 Mus., 1141. 



Smaller and more slender than S. catenatus ; rattle very small ; 

 loreal present, sej)arating the post-nasal from the preocular; scales 

 in 23 rows (occ. 21); ventrals 127-140; subcaudals 20-36. 

 Length about 550 mm. (tail between one-seventh and one-eighth). 



Gray, yellowish or brbwn, more or less dark; seven series of 

 blotches on the body, disposed much as in the genus; the dorsals 

 are dark, often purplish, irregular in shape, and from 38-45 in 

 number; the interspaces on the vertebral line are often red; the 

 head markings are much as in the last species, but the dark spot 

 on the parietals is absent and the lower light line on the side of the 

 head begins on the post-oculars, instead of the nasal; belly yellow 

 with blackish blotches. 



Hab. — North Carolina and Florida to Texas; up the Mississippi 

 valley, probably to Illinois. 



CEOTALUS L. 



Sjst. Nat., Ed. X, 214 ; B. and G.,l. c.,\; Cope, I. c, 686, and Rep. 

 Nat. Mus., 1149 ; Boul., /. c, III, 572. 



A pair of large erectable, perforated poison fangs in front of the 

 upper jaw; no other maxillary teeth; loreal pit and rattle present; 

 top of head covered with small scales; scales keeled (outer sometimes 

 smooth), with pits, in 23-31 rows; anal and subcaudals not divided. 

 Size medium or large. 



Hab. — North and South America. 



