336 



GENERAL ZOOLOGY 



A very common example of this type of mimicry is the case 

 of the resemblance of the viceroy butterfly, Basilarchia archippus, 

 to the monarch butterfly, Danaus menippe (Fig. 191). Both are 

 rather large butterflies of a warm-brown color, with black lines. 



-*%? 



Fig. 189. Fig. 190. 



Fig. 189. — Phyllium, the green-leaf insect, a South American form. (From 

 Jordan and Kellogg, Evolution and Animal Life, D. Appleton-C'entury Company. 

 By permission.) 



Fig. 190. — The walking stick, Diapheromera, on a twig. (From Jordan and 

 Kellogg, Evolution and Animal Life, D. Appleton-Century Company. By per- 

 mission.) 



The monarch butterfly is distasteful to birds, and therefore 

 escapes, to a certain extent, from being eaten by birds. The 

 viceroy, on the other hand, is edible but is in all probability 

 frequently unmolested because of its resemblance to the inedible 

 monarch. In these and other cases of mimicry the condition 



