31-4 DK. 11. GADOW OX EVOLUTION [Mar. 20, 



Q-striped assembly, iu which all the stripes aie conspicnovis and 

 well separated or emphasised by dark fields. 



In 1 immature 9-sti'iped male the central or 5th stripe is long, 

 but represented by a dotted line only. 



In 14 cJ and 2 $ the 9 stripes are complete. 



In 1 d" i«^d 3 2 the central stripe is divided into two, indi- 

 cating 10 stripes. 



In 1 (5* 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 vmder 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 iield nnd Held I. are uniformly brick-red to bright 

 red, b\at this colour, of strikingly beautiful 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 pronounced in the 

 only male which is devoid of red bands; length 75 nnn., throat 

 mottled with black. 



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

 stripes, which ai'e always sharply marked, and there is no faint 

 mid-field between stripes 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 central stiipe being rather faint, or short, occur 

 5 times, in young and old of both sexes. 



9 strijoes, all distinct and complete, occur 7 times, in \'oung 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 

 I'are. Only two specimens have botli lateral and first field red ; 

 in a thii'd only the lateral field is red, and in a fourth both fields 

 ai'e pale leddish 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 l)lack, with the exception of 

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

 suffusion 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 Guei-rei-o, had better not be dealt with summarily, since 

 they show some marked local peculiarities. Unfortunately I could 

 collect only limited ninnbers, 5 at Cocoyul, 3 at ]\Iiahuiclian, and 

 3 at San Luis Allende, and the remaining 1 2 are likewise not all 

 from one place only. 



The following local variations seem to be worth noting :— 



