42 



EXPERIMENTS IN THE BREEDING OF CERIONS. 



On June 27, 1915, we recovered 36 adults, which were measured, 

 photographed, and replaced. The measurements can be seen in table 

 25 and the specimens are depicted on plate 44. 



TABLE No. 25. Measurements of the first generation of Florida-grown Cerion casablancce 



from Loggerhead Key Colony C. 



In May 1916 we added to this colony 73 adults of the first-grown 

 Florida generation from Colony B, and also the 7 living specimens from 

 Colony J. 



In July 1917 we found 9 specimens of the second generation. 



In 1918 the colony was not visited, but in January 1919 we found 

 100 adult specimens of the second generation from this colony. Meas- 

 urements of these are shown in table 26 and figures thereof are given 

 on plates 45-47. These specimens, together with 25 tips of the second 

 generation, were planted as Colony O. (See page 43.) 



THE LOGGERHEAD KEY COLONIES H AND I. 



These are discussed under Colonies H and I of Cerion viaregis. 

 (See pages 25 and 26.) 



THE LOGGERHEAD KEY COLONY J. 



In June 1915 we placed 122 adult and 14 immature Florida-grown, 

 first-generation Cerions in a little clearing on the east side of the path, 

 halfway between the laboratory and Colony A. The place was marked 

 by a stake and a tag bearing the legend "Cerions, 1915, J." 



In May 1916 we recovered 121 of these, but all except 7 were dead. 

 They had not left the region about the stake where we had dropped 

 them. It is probable that our planting them during the heat of the 

 day with their epiphragm broken may have had this disastrous effect. 

 The 7 living specimens were placed with Colony C. 



No specimens were observed in 1917, but in January 1919 we found 

 a few in the region of this planting, which goes to show that it is never 

 quite safe to say that a colony is extinct. 



