314 DK. H. GADOW 0^f EVOLUTION [Mar. 20, 



9-stripecl assembly, in which all the stripes are conspicuous and 

 well separated or emphasised by dark fields. 



In 1 immature 9-striped male the central or 5th stripe is long, 

 but represented by a dotted line only. 



In 14 d" and 2 5 the 9 stripes are complete. 



In 1 c5' and 3 5 the central stripe is divided into two, indi- 

 cating 10 stripes. 



In 1 c? and 1 $ (the largest $ known) there are 10 stripes. 



The females have the under parts white, and the dorsal stripes 

 are all very sharp and white on a mostly black ground. In the 

 males, the under parts are black, with the exception of the throat 

 which is whitish ; in only a few old males the black colour ex- 

 tends from the collar a little way up the throat, sometimes covering- 

 its lower half. 



The lateral field and field I. are uniformly brick-red to bright 

 red, but this colour, of strikingly beautifiil effect in the live lizard, 

 is liable to fade in spirit. In only four males occur pale spots 

 in the first and in the lateral field, and some of these spots begin 

 to invade stripe I. The white spots are most j)i'onounced in the 

 only male Avhich is devoid of red bands ; length 75 mm., throat 

 mottled with black. 



Pacific Coast to San Luis, Guerrero: 23 specimens. — With 7 to 10 

 stripes, which are always sharply marked, and there is no faint 

 mid-field between sti-ipes 3-3. 



7 stripes occur 3 times, in 1 adult male and in 2 younger males, 

 one of them with an indication of division into 8 stripes. 



8 stripes occur 6 times, in young and old of both sexes. 



9 stripes, the cential stripe being rather faint, or short, occur 

 5 times, in young and old of both sexes. 



9 strijjes, all distinct and complete, occur 7 times, in young and 

 old of both sexes. 



10 stripes occur twice, in young females. 



The stripes are most prominent in the females, because of the 

 fields being black. Red or reddish field-bands in the males are 

 rare. Only two specimens have both lateral and first field red ; 

 in a third only the lateral field is red, and in a fourth both fields 

 are pale reddish bi'own. In the majority these fields are dull, 

 with faint lighter spots in the first field, and the posterior half of 

 stripe 1 is liable to break up into white beads. 



The under parts of the males are black, with the exception of 

 tlie throat, which is greenish white, very rarely with a slight 

 sufiusion of black; but the 3 males from Miahuichan have 

 entirely black throats like the Balsas specimens. 



Perhaps the 23 specimens enumerated above, from the Coast 

 land of Guerrero, had better not be dealt with summarily, since 

 they show some marked local peculiarities. Unfortunately I could 

 collect only limited numbers, 5 at Cocoyul, 3 at Miahuichan, and 

 3 at San Luis Allende, and the remaining 12 are likewise not all 

 from one place only. 



The following local variations seem to be worth noting : — 



