80 ILLIXOIS BIOLOGICAL MONOGRAPHS [474 



PLATE V 



Figures 42-49. Showing an analysis of the color patterns of Cicindela. 



Explanation of Plate 



Fig. 42. Showing the full number of longitudinal stripes represented in the 

 group — compare with figures 169, 1690, and 169b (tetragramma Boisd.) ; 43, show- 

 ing the three longitudinal stripes nearly always represented — compare with 52 

 (C. tetragramma, variation) and 54, desgodinsi Fair (Tibet) ; 44, showing the 

 splitting of the stripes as suggested in 53, lugubris Dej. (Africa) ; 45, showing 

 the full number of cross bands numbered / to 7; 46, showing the commonest 

 cross bands illustrated in 58 (regalis Dej. Africa) ; 47, showing a second com- 

 mon type illustrated by 75, in which none of them reach clear across ; 48, show- 

 ing all the possible spots that can occur from a combination of the longitudinal 

 stripes and cross band shown in figures 42 to 47 ; 49, showing the spots which 

 are most commonly present or joined to form characteristic patterns in the group. 



A and a are usually fused on account of the crowding together of the 

 tracheae. The cross bands are never all represented entirely across the elytron, 

 but by dots as in 62, C. vigintiguttata Herbst (India). The fusion of Ai, A2 

 and B3 gives the characteristic humeral lunule of students of the group, the hook 

 frequently present is made by joining it with B2. The fusion of Ci and C2 and 

 of C? and C4 gives the characteristic markings shown in the line C. of many old 

 world species. The union of A4, B4 and B$ gives the characteristic middle band 

 of the group. A3 is of rare occurrence (see Fig. 198). A 5 is commonly present 

 as a spot, also A6, B6 and C6 are less common in occurrence (see Figs. 6 and 7, 

 PI. I). 



