COIyOR PATTERN 01^ ^PICRANIUM. 



73 



Table 17. — Variation in the proportion between the pigmented and unpigmented areas in 

 the epicranium of L. undecimlineata, L. diversa, L. signaticollis, L. multitceniata, 

 L. oblongata, L. decemlineata, and L. intermedia. 



Classes. 



Per cent of frequency. 

















Class I 



L. undecim- 

 lineata. 



L. diversa. 



L. signati- 

 colUs. 



L. multitcB- 

 niata. 



L. oblon- 



L. decem- 

 lineata. 



L. inter- 

 media. 







.... 







2 





2 





.... 





0.4728 



0.6308 



5 



4 



3 









0.9456 



3.7848 



12 



16 



4 













3-5461 



14.8218 



54 



60 



5 



0.90 







17.2577 



67.5158 



20 



15 



6 



15.30 



8 



2 



10.4019 



10.4082 



7 



4 



7 



24.32 



26 



12 



13-4754 



1.8924 





I 



8 



47.75 



66 



25 



22.9314 



0.6308 





.... 



9 



11.73 





52 



27.8359 1 0.3154 





.... 



10 









8 



3.0732 



... 





.... 



L. undecinihneata : (Panama, Costa Rica, Nicaragua, Guatemala, Mexico). N.= 1,230 



individuals. Mean of classes = 7.5447. 

 L. diversa : {^aMscc, Mexico). N. = 100 individuals. Mean of classes = 7.58. 

 L. signaticollis : (Mexico). N. = 1,000 individuals. Mean of classes = 8.45. 

 L. multitceniata: (Mexico). N. = 4,230 individuals. Empirical modes = greater, class 



9 ; less, class 5. Mean of classes = 7.2733. 

 L.oblongaia : (Mexico). N. =3,170 individuals. Mean of classes = 4. 9303. 

 L. decemlineata: (United States and Canada). N. = 6,650 individuals. Mean of 



classes = 4.000. 

 L. intermedia : (Mexico). N. =: 100 individuals. Mean of classes = 4.0200. 



Tabi^E 18. — Position of the empirical mode of the species of the lineata group upon the 

 scale of color proportion used in the foregoing tables. 



Classes. 



species. 



Percent 

 in modal 



class. 



! Classes. 



Species. 



Per cent 



in modal 



class. 



Class 2 1 



4 { 



5 1 



L. defecta 



I/, juncta 



82 

 68 



60 



17.2577 



67.5153 



Class 8 1 



1 A 



1 



1 

 1 



L. imdecimlineata . 



Iv. diversa 



ly. multitaeniata 



Iv. signaticollis 



L melanothorax. . . 



47.75 

 66 



27.8959 1 

 52 

 100 



1 



L. decemlineata... . 



L intermedia 



L. multitseniata . . . 

 Iv. oblongata 



Comparison of tke epicranium a^id pro7iotum in the lineata group. — The color 

 pattern of the epicranium shows, as far as the proportion of pigmented to 

 unpigmented areas is concerned, essentially the same phenomenon as that 

 exhibited by the pronotum — that is, the modes for the different species are 

 located at various points along the scale of proportion used. If we compare 

 table 18 with table 14, which gives the position of the modes of the pro- 

 notum, we see that in the main the position of the modes for each species is 

 the same in both tables. In both melanothorax occupies the highest place 

 and defecta the lowest, while undedmlineata and diversa are in both cases in 

 the same modal class. Signaticollis changes its position in table 18 to one 



6— T 



