Explanation of Plate 20. 



This plate illustrates the ontogeny of the coloration upon the abdominal 

 segments and the hind wings of several species of Leptinotarsa. 



Figs. I to 5, L. oblongata. 



Figs. 6 to 10, L. undecimlineata. 



Figs. 11 to 15, L. undecimlineata. 



Figs. 16 to 20, L. multitceniata. 



Figs. 21 to 24, L. signaticollis. 



Figs. 25 to 28, L. oblongata. 



Figs. 29 to 32, /.. dileda. 



