m»., 1908.] Wright: Life History 01 Datana row :; 



August 21. All resting ; head and anal extremities raised in char- 

 acteristic attitude. Yellow lines a little more distinct. Some increase 

 in size noticeable. 



August 22. 8 A. M. So far as I can see there is no change since 

 last observation. Perhaps the body is a little larger and the color a 

 trifle deeper. The yellow stripes nearest the dorsal are somewhat 

 blended by the clouding of the interspace. 



Note. — I have come to the conclusion that there are no anal feet 

 as in other larvae that I have observed. The tubercles that were 

 noticed in a former observation are in all probability anal feet that have 

 for some reason degenerated into tubercles, and clothed themselves 

 with hairs or spines either as a matter of protection or for some phys- 

 iological reason. When excreta are cast they cling to the hairs on 

 these organs and are gradually worked off until free from the body. 

 In the younger stages the excreta are often held together in long bead- 

 like strings. 



6 P. M. Still at rest or moving in a sluggish manner. Just back 

 of the head there appears to be a slight constriction. In some speci- 

 mens there is a small area between the head and the beginning of the 

 body color; this area is transparent or a watery pink. The body is 

 quite thick as compared with the head, which has heretofore been the 

 most prominent part of the caterpillar. 



August 23. 7 A. M. One caterpillar has moulted. The head is 

 very light pink and semitransparent. The red of the body is some- 

 what darker. The stripes are more accentuated, hairs more prominent, 

 white. A collar of longer hairs is seen just back of the head. 



3 P. M. Practically all have moulted. The head has turned a 

 shiny jet black. A few are moving about restlessly ; none are feeding. 



August 24. 8 A. M. The caterpillars have been eating during 

 the night. They are now eating through the whole body of the leaf, 

 feeding along its edge. 



7.30 P. M. Clinging in small masses to the leaves and eating 

 ravenously. 



August 26. Increased size the only perceptible change. All at 

 rest on the back of the leaf away from the light ; this is the only time 

 I observed that they were particularly affected by the light. They ate 

 very heavily during the night. 



August 27. 8 A.M. Ate heavily during the night. About half 

 an inch in length. Color becoming darker. 



