22 PROCEEDINGS OF TilE ACADEMY OF [Jan., 



from Tucson, Ariz., by Mr. Herbert Brown, and were ascribed by 

 Cope (^. c. , p. 051) to insirjniarum. They Avere at the time con- 

 sidered by me to be merjalops. They are now in the Academy's 

 collection, and reexamination shows that they do not correspond to 

 Cope's description of the first species, n ir to five examples of that 

 supposed form from Mexico, but they do agree in all respects with 

 Kennicott's description of megalops, except that the spots are 

 slightly more distinct and the upper labials are variable; one has 

 them 8-8, another 8-9, and the third 9-9. In the five macrostemma 

 Kenn. (^ hi'iicjniarum Cope) from Mexico, the largest of which 

 measures 990 mm., I find the tail to be about one-fourth of the 

 length, or longer than in most adult vier/alops, which reverses the 

 proportions given by Cope ; a smaller megalops from Duck creek, 

 New Mexico, in the Cope collection, 610 mm. long, has the tail 

 about .26, and more ventrals and subcaudals, but is otherwise 

 exactly like my Tucson specimens. 



Hab. — New Mexico, Arizona and northern Mexico. 



Eutaenia elegans B and G. 

 I. c, 34. 



As a rule elegans has 21 rows of scales and 8 labials, but varia- 

 tions to 19 rows and 7 labials are not uncommon, and in one form 



23 rows sometimes appear; oculars 1 (2)-3 (4); temporals 1-2 

 (sometimes 1-1 or 1-3); posterior chin shields about equal in 

 length to the anterior; head rather small; eye small or moderate ; 

 size rathftr smaller than E. sirtalis ; tail .19-25 of length; ven- 

 trals 144-180; subcaudals 53-90. The lateral stripe is on the 

 second and third rows ; the diversity of color is considerable, and 

 is best stated under subspecific heads. E. elegans is a western* 

 form, ranging from the central plains to the Pacific coast. 



Key to the Subspecies. 



ct. — Post-oral crescent absent: 



Color dark ; spots and lat. stripe often indistinct, 



1. E. e. elegans. 

 Color lighter; spots encroaching on stripes, 



2. E. e. vagrans. 

 Often 2 preoculars and 23 rows; otherwise like vagrans, 



3. E. e. biscutata. 

 b. — Post-oral crescent present: 



Spots and strijies distinct, . . . . 4. E. e. marciana. 

 Spots and stripes indistinct or absent, . 5. E. e. couchi. 



