Mar., 1908.] Wright: Life History of Data ."> 



are now about two inches in length, black in color, stripes less promi- 

 nent. They have rested but little during this stage, but have rather 

 been constantly on the move. At five this evening they are at rest 

 or wandering aimlessly about the cage. The leaves are eaten in 

 only. There is slight enlargement of the body just behind the head 

 much as in the previous stage just before moulting though the skin is 

 not broken. 



September 14. At 8.30 this evening the last caterpillar entered 

 the earth to pupate. 



Recapitulation. 



Eggs laid July 29, larvae emerged August 16, 18 days. 

 First stage August 16 to August 22, first moult, 6 days. 

 Second stage August 22 to August 28, second moult, 6 days. 

 Third stage August 28 to September 2, third moult, 5 days. 

 Fourth stage September 2 to September 9, fourth moult, 6 days. 

 Fifth stage September 9 to September 14, fifth moult, 5 days. 

 Pupa. — The pupa remains in the earth until July or August of 

 the following year. 



Datana robusta Strecker. 



Egg.* — Laid in a cluster on the leaves of the food plant. Spherical or 

 pyriform ; white ; smooth or very lightly punctured. A slight depression at apex, 

 with a minute black point in the center. The larva eats a circular but very uneven 

 exit from the egg. Hatched August 15, 1907, P. M. 



first Stage. — Head black ; wide. Body light honey yellow, transparent, the 

 internal organs showing through, a dark subdorsal shade ; cervical shield, anal plate, 

 and anal legs, black ; thoracic and abdominal legs partly black. Tubercles black, 

 from which arise long black hairs, as well as from the anal feet. The anal feet and 

 posterior part of the body are slightly elevated in repose. They live together in a 

 rather compact colony. 



Second Stage. — Changed August 18. Has the characteristic attitude of D 

 larva with elevated cephalic and anal parts. Head black, shining, punctured. The 

 body is about the same as in the first stage, the hairs shorter; the dark sir 

 band more distinct. Body not so transparent. Tubercles smaller. The subdorsal 

 band is a decided blood red, extending the whole length of the body. 



Third Stage. — Length .50 inch ; width .05 inch. Head slightly wider than 

 the body, punctate, sparsely covered with short whitish hairs, distinctly 

 deeply) above. Clypeus smooth and shiny. 



Cervical shield, suranal plate and anal legs shiny black and clothed 

 tered hairs ; hairs on the suranal plate and anal legs black. 



* These descriptions, except that of stage three, were prepe 

 Grinnell, Jr. 



