. Carnegie Institution of Washington publication. 383 The Mechanism of Evolution in Leptinotaksa In the season of 1906 the first generation showed no especial change from the conditions shown at the close of the previous year. In both sexes biotype 5 was much reduced, 6 was also reduced, and 8 represented by a few at the upper end in the males and by a distinctly isolated group in the females. Biotype 1 was present in both in small numbers, and 11 was found only in the females. The two distributions are essentially the same. 9â ^ 62 / ^^ y^ « ^, \ P---^ 18 19 12 8 '" 429 Males. Total 976
. Carnegie Institution of Washington publication. 383 The Mechanism of Evolution in Leptinotaksa In the season of 1906 the first generation showed no especial change from the conditions shown at the close of the previous year. In both sexes biotype 5 was much reduced, 6 was also reduced, and 8 represented by a few at the upper end in the males and by a distinctly isolated group in the females. Biotype 1 was present in both in small numbers, and 11 was found only in the females. The two distributions are essentially the same. 9â ^ 62 / ^^ y^ « ^, \ P---^ 18 19 12 8 '" 429 Males. Total 976. 547 Females. Fig. 72.âCensus of first annual generation at Texcoco in 1906, stiowing con- tinuation of the same condition present in the last generation of previous year. I 6 ,j,n 11 '^ "- * â .^â-33 9 ^ .^ ^^ 12 .. ^ ^ ^g ^ ^ 103 -' i3^^ â ^-- 42 ' w y av?- -â81 ; \ \ â ^"T" 36 / \ \ V^:@#- 19 8 41 17 42 ^^ 12 573 Males. Total 1113. 540 Females. k. Fig. 73.âCensus of second annual generation at Texcoco in 1906, showing con- dition with regard to pionotal pattern. In the census of the second generation, biotype 1 was absent in both sexes and 5 was represented by a mere trace; 6 and 8 were fairly shown in the males, but in the females were weakly represented, while 9, 10, and 12 were best developed in the females, where 13 was found as a distinctly isolated group, the only one in the entire population. The records of the two generations are shown in the figures 73 and 73. Comparison of these two generations in the season of 1906 at Texcoco and at Chapultepec shows differences that seem permanent to the two locations in the population living there. In this year, at the Chapultepec. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegi
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