74 



VARIATION IN I.^PTIN0TARSA. 



above that of undecimlineata^ and multitceniata shows two modes, the high 

 mode being the same as that of signaticoUis and the low one the same as 

 that of oblongata. 



The percentage of individuals found in the modal classes is shown in the 

 following table : 



Tabi,E 19. — Comparison of the per cent of individuals in the modal classes of the dif- 

 ferent species of the lineata group. 



species. 



Per cent in modal class 

 in seriation of— 



Species. 



Per cent in modal class 

 in seriation of — 



Pronotum. 



Epicranium. 



Pronotum. 



Epicranium. 



ly. angnstovittata. . 

 defecta 



Per cent. 



78"' 

 60 



85 

 100 



26.6675 



Per cent. 



54 

 58 

 90 

 100 

 54 



L,. oblongata 



intermedia 



multitaeniata . . 

 signaticoUis , . . 

 diversa. .... 

 undecimlineata 

 1 



Per cent. 

 39 

 25.5 

 23.2688 



56 

 70 

 38.164 



Per cent. 



67.5158 



29 



27.8959 



52 



66 



47.75 



juncta 



rubicunda 



melanothorax . . 

 decemlineata . . . 



In this table it is apparent that where the percentage of individuals in 

 any modal class is high when the pronotum is taken as the standard, the 

 per cent of individuals in the corresponding class of the epicranium is also 

 high and in most of the species higher than in the pronotum. In only a 

 few cases does the percentage of individuals in the modal class of the epicra- 

 nium fall below that of the corresponding class of the pronotum, and even 

 in these cases the differences are slight, being only 4 per cent in L. signati- 

 coUis and L. diversa. 



The range of variation in the color values in these two parts of the body 

 is also of interest. It is shown briefly in the following table : 



Table 20. — Comparison of the range of variation of color proportion in the pronotum 

 and epicranium of the species of the lineata group. 



Species. 



Range in 

 classes. 



Per cent occu- 

 pied of pos- 

 sible range. 



Species. 



Range in 

 classes. 



Per cent occu- 

 pied of pos- 

 sible range. 



Prono- 

 tum. 



Epicra- 

 nium. 



Prono- 

 tum. 



Epicra- 

 nium. 



Prono- 

 tum. 



Epicra- 

 nium. 



Prono- 

 tum. 



Epicra- 

 nium. 



L. defecta 



juncta . . - 

 rubicunda. . 

 melanotho- 

 rax 



decemline- 

 ata 



oblongata. . 



4 

 6 



4 



I 



15 

 8 



3 



4 

 3 



I 



I 



20 

 30 

 20 



5 



75 

 40 



30 

 40 



30 

 10 



I/, intermedia. 



multitaeni- 

 ata 



signaticol- 

 lis 



diversa . . 



undecimli- 

 neata 



7 



13 



7 

 3 



9 



4 

 9 



6 



3 



5 



35 

 65 



35 



^5 



45 



40 



90 



60 

 33-3 



50 



