10 



BULLETIN 351, U. S. DEPARTMENT OF AGRICULTURE. 



After periods of unfavorable weather lasting from 3 to 5 days dead 

 young are always found in the brood chambers. Unfavorable 

 weather up to 3 days duration does not seem to have an unfavorable 

 effect upon the unemerged larvae. 



EMERGENCE. 



Unless weather conditions interfere, the emergence starts upon the 

 second day after the young appear in the brood chambers. 



In 1912 a scattered emergence started in the orchard at Mont Alto, 

 Pa., on June 8, with the first young in the brood chambers on June 

 6. These specimens showed the regular two-day interval between 

 birth and emergence. The regular emergence did not start until a 

 week later. 



Emergence from 26 isolated females started June 16, and gave 

 its daily maximum on June 18. Upon June 25, 50 per cent had 

 emerged, and 75 per cent had emerged July 1. Emergence from 

 these scales ceased July 17, after 4,273 had emerged. Twenty-nine 

 specimens in all were isolated at the start of the foregoing experi- 

 ment. Data from all these are included in Table VII. Specimens 

 numbered 12, 16, and 23 were so manifestly abnormal that they were 

 omitted in calculating the foregoing percentages. 



Table VII. — Record of 29 isolated females of the terrapin scale during the emergence 

 period of 1912, at Mont Alto, Pa. 



No. 



Total 

 emer- 

 gence. 



Last 



larva 



emerged. 



Scale 

 loose. 



Scale 

 dropped. 



Scale 

 taken. 



Embryos 

 by dis- 

 section. 



Number 



dead 

 embryos. 



1 



142 

 121 

 189 

 214 

 245 

 189 

 152 

 137 

 119 

 143 

 303 

 3 

 146 



88 

 220 



11 

 124 

 168 



71 

 187 

 349 



45 

 1 



42 

 291 

 144 

 151 

 153 

 125 



July 8 

 July 3 

 July 9 

 July 3 

 July 15 

 July 13 

 June 26 

 July 7 

 July 15 

 June 27 

 July 7 

 June 21 

 July 2 

 July 8 

 July 12 

 June 24 

 July 15 



...do 



June 24 

 July 15 

 July 12 

 July 15 

 June 22 

 July 8 

 July 6 

 July 11 

 July 6 

 July 15 

 July 8 



July 12 



July 4 





July 12 

 July 5 

 July 15 

 July 3 

 Julv 15 

 ...do 



451 

 

 60 

 204 

 218 

 192 





2 





All 



3 





Most 



4 







Do. 









Do. 



6 



July 8 



June 26 



Do. 



7 





8 



July 10 



July 10 

 July 15 



37 

 150 



Do. 



9 





All. 



10 





June 30 





11 



July 12 



July 12 



326 





12 



June 24 

 July 3 





13 . . . 











14 . . . 



July 11 



July 11 

 July 15 



8 

 195 



All. 



15 







16 





July 7 





17 





July 15 

 ...do 



97 

 138 



All. 



18 





June 25 



Do. 



19 





20 





July 15 



...do 



...do 



22 

 193 

 24 



Do. 



21 . 





June 25 



Do. 



22 



Do. 



23 i 





24 



July 8 

 July 6 



July 8 

 July 6 



145 

 343 



Do. 



25 





Do. 



26 



July 12 





27 



July 11 



July 11 

 July 15 

 Julv 11 



359 



148 



73 



Most. 



28 





Do. 



29 



July 11 





Do. 









Total 



4,273 



3,383 

















Larva of Hyperaspis binotata emerged June 24. 



Total embryos, 7,656. 



