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Show 314 DK. H. GADOW ON EVOLUTION [Mar. 20, 9-striped 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 clotted line only. In 14 $ and 2 $ the 9 stripes are complete. In 1 d1 and 3 $ the central stripe is divided into two, indicating 10 stripes. In 1 o* 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 extends from the collar a little way up the throat, sometimes covering its low^er half. The lateral field and field I. are uniformly brick-red to bright red, but 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 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 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 stripe being rather faint, or short, occur 5 times, in young and old of both sexes. 9 stripes, 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 twTo 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 brown. 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 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 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 :- |