BLUEBERRY INSECTS IN MAINE. 253 



All of the writer's observations were made in the vicinity of 

 Cherryfield, Maine, as this town offered the easiest access to the 

 barrens. In 1913 two trips were made to the plains, the first on 

 July 30 and the second on August 14. Adults were present on 

 both dates. Rather more data are available for 19 14. On July 

 2 the writer made his first visit to the plains for that year. No 

 flies had yet emerged. An attempt to dig out puparia was 

 partially successful for a few were obtained, but this is an im- 

 practicable procedure partly because, as the puparia are so 

 scattered, much soil must be sifted to reveal only a few, and 

 partly because the tangled mass of roots and underground 

 stems renders digging very difficult. No flies emerged from any 

 of these puparia and subsequent examination showed that all 

 were dead, probably, as will be made clearer later, because they 

 were dug on "new burn." On July 20 a few adults were cap- 

 tured and it seems fair to assume that they began to emerge 

 about the middle of the month. On July 30 and August 12 the 

 flies were fairly common, but they were decidedly more numer- 

 ous on August 18-20. Images were still fairly common but 

 noticeably fewer on August 25 and but one fly was observed on 

 September 10. Adults were fairly common on August 26, 19 15. 



Under artificial conditions emergence covers a considerable 

 period of time. Pupae obtained from material collected during 

 the summer of 1913 were kept at room temperature through the 

 following winter and spring. February 11, 1914 and May 8. 

 1914 were the extreme date.<^ of the emergence of adults from 

 puparia kept under exactly the same conditions in the laboratory. 

 None emerged however between February 11 when a single 

 female developed and April 3. 35 out of the total 54 emerged 

 between April 14 and April 27. 



As the puparia which were dug in the field failed to produce 

 adults the writer was unable to determine the preoviposition 

 period. No maggots were found on July 30, 1914 but on 

 August 12 larvae at least a week old were fairly common. This 

 would indicate a preoviposition period of at least 15 days and 

 probably longer. Doctor Illingworth (Cornell Exp. Sta. Bui. 

 324, p. 143) records it as 24 days for specimens bred from apple. 

 In this bulletin is published also a detailed account, with figures, 

 of the development of the eggs in the female. 



