Vor. IIT] VAN DENBURGH AND SLEVIN—ARIZONAN REPTILES 411 
postoculars 2-2, loreal O-O, temporals 1+-1, posterior genials 
shorter, black bands 19 on body and 4 on tail. 
No. 33840 has scale rows 13, gastrosteges 121, anal divided, 
urosteges 23, supralabials 7—7, infralabials 7-7, preoculars 1-1, 
postoculars, 2-2, loreals 0-O, temporals 1+1, posterior genials 
shorter, black bands 21 on body and 4 on tail. 
No. 34172 has scale rows 13, gastrosteges 122, anal divided, 
urosteges 25; supralabials 7—7, infralabials 7-6, preoculars 1-1, 
postoculars 2—2, loreals 1-1, temporals 1+-1, posterior genials 
shorter, black bands 20 on body and 4 on tail. 
In life the dorsal portions of the white rings are suffused 
with reddish orange. 
The black bands are not so widely separated as in Sonora 
occipitalis. No. 34172 has a well developed loreal on each side 
of the head, but in other respects is quite typical. 
In No. 17551, the prefrontal reaches the labials on one side 
of the head but not on the other, where the postnasal and pre- 
ocular are in contact. 
No. 33834 has the prefrontals separated from the labials by 
the meeting of the postnasal and preoculars. No. 34172 has 
them separated by the intervening loreals. The other two 
specimens have the prefrontals and labials in contact. 
We, therefore, cannot recognize Cope’s Chilomeniscus ephip- 
picus as distinct from his C. cinctus. 
47 —Sonora semiannulata Baird and Girard 
There can be be no doubt that the snake described under this 
name by Baird and Girard is the same species as Cope’s Contia 
_or Chionactis isozonus. This being true, both the generic and 
specific names of Baird & Girard must replace those later sug- 
gested by Cope. Hallowell’s Lampfrosoma seems not to be 
generically distinct, although the species occipitale is so. We 
thus have in Arizona three species of Sonora as follows: 
Sonora semiannulata=Chionactis isozonus 
Sonora episcopa —=Chionactis episcopa 
Sonora occipitalis ==Chionactis occipitalis 
We have seen no evidence of intergradation of these forms, 
and therefore regard them all as species, although Cope states 
that intermediate types of coloration connect the first two 
forms. 
