1906.] IN MEXICAN LIZARDS. 309 



rows of numerous white spots : C. guttatus iimnutahilis 

 (text-fig. 74). — From Colima to the Isthmus of Tehuantepec, 

 from the coast of Oaxaea and Guerrero extending inland 

 up to an altitude of 2000 feet. 



B. Throat during life dull brick-red. Ground-colour of back 

 dull olive-brown, with several obsolescent rows of yellow- 

 white spots : C. guttatus guttatus (text-fig. 75). — Atlantic 

 Tierra caliente from Vera Cruz to Tehuantepec, restricted 

 to the lowlands of less than 1000 feet elevation. 



CjSTEMIDOphorus deppei Wiegmann. 

 (Text-figs. 71 D-G & 72 A-G.) 



ISTumber of specimens examined, 152. 



Size of adult $ , 60-71, average 63-65 mm.; of adult J , 66-83, 

 average 70-75; exceptional length of 79, 81, and 83 occurring 

 once each. 



Supraocular shields. — The normal number is 3. Amongst the 

 113 specimens of my own collecting are 11 exceptions, i.e. nearly 

 10 per cent. : 4 with well- developed 4th shields on both sides, 

 4 with a tiny 4th scale on both sides, and 3 with a tiny 4th scale 

 on one side only. 6 of these exce]3tional specimens belong to the 

 20 which were collected between the Pacific coast and San Luis 

 Allende ; 3 others belong to the 21 specimens from Tierra 

 Colorada. All the rest are normal, amongst them all the 26 

 specimens from Rio Balsas and the 26 from Tequesixtlan. 



Front of himieriijS protected by 3 longitudinal rows of enlarged 

 scales, or by 4 to 5, or 5 rows which are cori-espondingly smaller. 

 These scales extend backwards onto the elbow^, without their 

 foi-ming a separate nest ; but, becoming still smaller, almost 

 granular, they may extend onto the back of the forearm. 



Posterior side offorearm{text-S.g. 72 D& F) covered with granules 

 which are arranged in longitudinal rows. In about 10 per cent, 

 these rows are composed of slightly enlarged granules, which 

 either form a little cluster or nest in the middle of the posterior 

 surface of the forearm, or they form the continuation of the 

 scaling from the humerus and extend more or less down the fore- 

 arm. In no case can these enlarged granules be called pol3^gones ; 

 frequently the diiference in size from the surrounding granules 

 is so small as to escape the naked eye. 



Anterior side of thigh. — There are generally 3 parallel rows of 

 considerably enlarged scales, which rows extend down to the 

 knee. Counting from the outermost or largest of these rows 

 inwards, across the thigh, to the femoral pores, thei^e are in all 

 about 5 or 6 rows, rarely more or less. They are, however, not 

 always complete ; frequently a row is represented by a few scales 

 only, which are intercalated and thereby considerably upset the 

 regvilar lines, which then are not easv to count ; but a rule-of- 



21* 



