PIvACE) VARIATION. 



95 



At Chicago I have observed this phenomenon during the years 1902, 1903, 

 and 1904, or for 6 generations. In the tables of distribution I have given the 

 sedations obtained from this material. In table 34 a is shown the variation in 

 the proportion of light to dark color in the epicranium, and in tables 346^ 

 34 c, and 34 D the frequencies for the same relation of the pronotum, elytra, 

 and ventral surface. In table 34 E) are given the polygons of variation in size 

 of the two sexes. 



Comparing the place condition polygons for decemlineata at the two local- 

 ities, it appears that at both there is marked place variation, although less at 

 Chicago than at West Bridgewater. However, I know of no reason why 

 continued observation might not show as great place variation at Chicago as 

 at other localities where it has been studied. 



That the phenomenon is not limited in the genus to L. decemlineata is 

 shown by the data obtained from the study of L. multitceniata during 1903, 

 1904, and 1905 at Guadalupe, Federal District, Mexico. The soil is a deep, 

 stiff adobe, well drained by ditches. I have shown the variations in the pro- 

 portion of light to dark color on the epicranium, pronotum, elytra, and ventral 

 surface for these years in tables 35 a^ 35 b_, 35 c^ and 35 d. In the polygons 

 of distribution of this species we see again a large amount of place variation, 

 even more than in decemlineata. 



Tabi,e 33. — Place variation in the epicranium, pronotum, elytra, ventral surface of ab- 

 dominal segments, size of males and females, and for the species as a whole of 

 L. decemlineata at West Bridgewater, Plymouth County, Massachusetts. ^ 



(A) PLACE VARIATION IN THE EPICRANIUM. 





















Class. 



Year. 



Gener- 

 ation. 





















































I 



2 



3 



4 



5 



6 



7 



8 



9 



10 



II 



12 



13 



14 



15 



1895. { 



I 



I 



4 



15 



56 



18 



4 



2 

















2.. . 



. . 



I 



3 



17 



20 



42 



10 



4 



2 



I 



. , 











1896. j 



I 







4 



j6 



20 



49 



9 



2 

















2 



. . 



7 



60 



18 



8 



5 



2 



















1897.; 



I 



2 



4 



19 

 2 



52 



20 



20 

 61 



4 

 12 



I 

 4 



I 









•• 









•• 



1898. { 



I.... 



I 



3 



17 



49 



19 



6 



3 



2 















. . 



2 .. 



2 



6 



25 



36 



22 



5 



2 



2 















. . 



1899. { 



I.. 





I 



2 



20 



45 



29 



3 









. . 











2 . . . 



. . 



I 



3 



8 



22 



37 



17 



8 



4 













. . 



1900. 



I . . . . 



9 



36 



27 



16 



7 



3 



2 



















2 



14 



39 



31 



II 



3 



I 



I 

















, . 



I901 [ 



I 



2 





7 

 5 



19 

 22 



50 

 46 



18 

 21 



6 



3 



3 









•• 











1902. 



I 





II 



52 



21 



II 



4 



I 



















2 



2 



10 



48 



28 



8 



3 



I 









•• 



•• 









^ In all of these tables the frequencies are given in percentages. 



