April, '15] McCOLLOCH: CHINCH BUG EGG PARASITE 259 



55° F. The average length of Hfe of these parasites was nineteen days, 

 with extremes of eleven and twenty-seven days. Seventy-eight para- 

 sites in the check lived an average of 3.5 daj^s, with extremes of twO' 

 and five days. 



Fig. 13— Life History Chart. 



Temperatures above 100° F. for three or four hours were fatal to the 

 adult parasites when they were confined in small vials, and tempera- 

 tures above 110° were fatal to the immature stages under the same 

 conditions. 



