COLOR PATTE:RN OF PRONOTUM. 



63 



Besides the variations described, certain others which are abmodal occur 

 from time to time. These, while of no great number or apparent impor- 

 tance in evolution, are of value in the interpretation of certain phases of color 

 variation. Some of these are found on plate 14, figs. 10, 11, and 12. 



In diver sa^ angustovittata , and signaticollis, which are the closest allies of 

 undecimlineata, the same kind and direction of variation are found. I have 

 not drawn figures of these species, but the variations appear in the tables. 



The color patterns of L. multitcBmata and decemlineata show a series of 

 variations of the same general nature as those of L. undecimlineata^ as will 

 be apparent from a study of figs. 13 to 22 on plate 14, in which are shown 

 the variations of these two species. In this series there is found the same 

 definite tendency toward reduction of the elements of the color pattern on 

 the one hand and increase on the other, the extremes being represented by 

 figs. 22 and 30. Irregularities and abnormalities are of the same nature as 

 those in L. imdecimlineaia and are to be explained on the same basis. 



With the exception of melanothorax , all of the species in the lineata group 

 have this same type of color pattern. 



The frequency and direction of fusion of the spots is of interest and shows 

 in the different species variation along definite lines which is apparent in 

 the following tables : 



Tabi^e 3. — Direction and frequency of the fusion of spots on the pronotum in L. unde- 

 cimlineata {Mexico, Guatemala, Costa Rica, Panama), 1,200 individuals. 



Order of 

 frequency of 

 occurreuce. 



Formulae showing color pattern. 



Individuals 

 showing 

 fusions. 









Per cent. 





a 



1 





I \ 



pm + am 

 a^ 



I 



94 



2 \ 



a-\-b 

 pm, + am, 

 a^ -\-b' 



} 



92 



3 { 



dAr-e 

 d^ + e' 



\ 

 i 



80 



4 { 



d-^e + f 

 rf/ + ^/ +// 



} 



63 



5 .] 



pm + am 



^/ 4. ^/ + rf/ 4. ^/ ^f 



• 



20 



6 ] 



a-\-b^d^f^e + c 

 pm, 4" CL'yn 



a^ J^b^ Jr d^ +f + e^ + c^ 



! 



I 



