1016 REPORT OF NATIONAL MUSEUM, 1898. 



II. Second row of scaks keeled; the first keeled or smooth; orbit above two 

 labials ; lateral stripe when present on second and third rows of 

 scales. 



1. Temporal scales, 1-2. 



* Scales in 21 (3) rows; superior labials 8. 



Two preoculars; suiierior temporals small; lirst row of scales keeled, 

 black, stripes indistinct ; head short, frontal wide. 



E. Mscutata Cope. 



One preocnlar; superior temporals small; head short, frontal wider, not 



touching preocular ; posterior labials higher than long; tail 3|^ to 



4f times in length E. elegans Baird and Girard. 



One preocular; a large superior temporal bounding occipital; frontal 

 narrow, toixching preocular; head long; labials all longer than 



high ; tail 3|^ in length E. aunristirostris Kennicott. 



** Scales in 19 (17) rows; eight superior labials. 

 a Scales in 17 rows. 



Slender ; eye large ; frontal narrow ; head very distinct ; no stripes 



nor lateral spots, except anteriorly E.chrysocejiliala Cope. 



aa Scales in 19 rows. 



Form slender, head very distinct, eye large; dorsal stripe mostly 

 on one row of scales, with the indistinct lateral stripe and belly 



white; a large black nuchal spot on each side E. eqites Reuss. 



Form robust, head little distinct; dorsal stripe yellow; lateral 

 8tri]ie indistinct, like the belly, olive to black ; no nuchal spot. 



E. infernaUs Baird and Girard. 

 Form stout, small; head little distinct; eye moderate; no stripes, 

 but a series of cross bands which inclose large spots. 



E. phenax Cope. 



Form slender ; small ; eye moderate ; no stripes, but six rows of 



small black spots E. sumichrastii Cope. 



* * * Scales in 19 (17) rows; superior labials seven. 



a Two preoculars (sometimes united). 



Heail scarcely distinct; two or three rows of spots on each side. 



E. leptoeephala Baird and Girard. 

 era One preocular ; inferior labials ten. 



Head scarcely distinct; postgeneials short; bands indistinct, con- 

 nected by a single series of brown crossbars on each side. 



E. scaiaris Cope. 



Head little distinct; form slender; stripes very distinct, yellow, 



separated by black or brown ; the scales with yellow keels ; lateral, 



band black bordered below E. prtlclirilatus Cope. 



Form stout, head distinct ; postgeneials longer than pregeneials ; two 

 rows of spots on each side, sometimes connected longitudinally 



above or below ; stripes pale E. sirtalis Linnaeus. 



"' * * * Scales in 19 rows; superior labials six. 



Inferior labials eight; head not distinct; gastrosteges 132; dark 

 olive with pale dorsal stripe E. l)r achy stoma Cope. 



2. Temporal scales, 3-2. 



* Scales in 21 rows; superior labials eight. 



Frontal wide, reaching preoculars; second row of scales as wide as first; 

 stripes distinct; abroad black band below lateral stripe; labials 

 brown bordered E. nigrilatna Brown. 



