CROCODILIANS, LIZARDS, AND SNAKES. 



601 



The subspecies of the (hiemidophoms (/Kho-is differ as follows: 



Stripes persistent, narrow, defined ; no black spots ; femoral scales in 6-8 rows ; hind 

 legs yellow spotted, and with a stripe behind ; smaller C. {/. fjularis. 



Stripes persistent, wide, ragged; spots in interspaces irregular; parietal plate very 

 narrow; muzzle elongate; legs neither spotted nor striped; large; 8 rows femoral 

 scales ; 6 infralabials C. fj. angustlcepn. 



Stripes vanishing, their interspace with black crossbars ultimately joining cross- 

 wise; femoral scales 8-10; hind legs spotted; infralabials 5-6; large. 



C. g. mariarum. 



Stripes broken up into rows of spots ; interspaces with yellow spots ; hind legs with 

 or without yellow spots; no posterior femoral stripe; a frenoorbital; 5-6 Infrala- 

 bials; large C.g. communis. 



Light stripes traceable anteriorly only; black bands broken up into transverse 

 spots by orange spots on body; hind limbs pale spotted; femoral scales 7-8 rows; 

 infralabials generally 6 ; medium C. g. scalaris. 



Anal plates 3-4 ; femorals in 8-9 rows; femoral pores 21; 6 infralabials; large scales 

 of collar equal ; stripes posteriorly obsolete ; interspaces in front spotted ; medium. 



C. g. sericeus. 



No light stripes; olivaceous with three rows of l/lack spots on each sid(> on anterior 

 fourth of body; femorals 8; infralabials 6; muzzle elongate; limbs unspotted; 

 medium e.g. seinifasciatiis. 



No light stripes; olivaceous, with l)lack bars on sides, which cross back on lumbar 

 region; rump and hind legs yellow-spotted ; femoral scales 8-rowed; infralabials 

 6 ; muzzle elongate ; medium C. g. coslatus. 



The geographical distribution of the subspecies is as follows : 



C. g. gidaris, Sonoran region. 



C. g. angusticeps, Yucatan. 



C. g. mariarum, Tres Marias Islands. 



C. g. communis, southwestern Mexico. 



C. g. scalaris, Chihuahua and southward. 



C. g. semifasciaius, Coahuila, Mexico. 



C. g. cosintiis,Mexico ; locality unknown. 



These forma may be compared with those of the C. tessellatns in color 

 characters as follows. I have already remarked ^ that this series of 

 variations follows quite closely those pointed out by European authors 

 to exist in the Lacerta mnrnlis. These have been made the subjects of 

 especial study by Professor Kimer, of Tiibingen, from whose paper- I 

 extract the following points of comparison: 



1. Lougitiulinally striped 



2. Dark interspaces pale-spotted 



Cnemidnphorus 

 tessellatus. 



G. t. perplextti. 



C. t. tessella- 

 tus a. 



3. Dark interspaces divided bv light I C. t. tessella 

 color. ■ tusp. 



i. Dark spots coiiHuont trausversely, 

 fortniin; crossbars. 



C. t. tessella- 

 tus y. 



5. Light spots not coiitiaeiit; light [ C. t. melano- 



stripes broken up; pattern re- ' stefhus. 

 ticulated. 



6. Dark si)ot.s separate and on a C.t. lubidus. . .' C. g. semifas- 



brown ground. 1 ciniiu!. 



Onemidophorus 

 gularis. 



C. g. gularis a . 

 C.g..'icalansa. 



O.g. scalaris fi. 

 C. g. costatua . . 



Other Gnemi- 

 dophori. 



C. octoliiieatus. 



C. sexlineatus. 



O.labialis 



C. septemvitta- 



tus. 

 G. grahamii . . . 



C. variolosus . 



Lacerta mura- 

 lis. 



Ij. m. eampes- 

 tris. 



L. m. albiven- 

 tris. 



L. m. stiiato- 

 maculata. 



I., in. reticu- 

 lata. 



L. in. tigris. 



L. m. pnnctida- 

 to/aseiata. 



'American Naturalist, December, 1891. 



2 Arehiv. f. Naturg., 1881, p. 239. 



