Mar. 3, 1919 



Species of Pegomyia Alining Dock 



237 



Tabi^E IV. — Length of the pupal stage of Pegomyia calyptrata — Continued 



Experiment No. 



A32. 



A34- 

 A36. 



A37- 

 A43- 



A188 



A190 

 A52. 



A60. 



A74. 

 A77. 



A78. 



A93- 



A97. 

 A102 



A107 



Number 

 of puparia. 



17 



4 

 II 



9 



6 



53 



18 

 2 



6 



5 

 2 



3 



71 



23 

 16 



(?) 



Puparia 



formed. 



[July 29 



{..do 



I.. do 



July 30 



Aug. I 



/..do 



l..do 



/Aug. 7 



l..do 



[Aug. 9 



{..do 



I.. do 



..do 



Aug. 12 

 /Aug. 21 

 \..do 



Sept. 2 



Sept. 3 

 /Sept. 4 



\..do 



fSept. 17 



..do 



..do 



..do 



...do 



Sept. 29 



(Oct. 10 

 ..do 

 ..do 

 ..do 



fOct. 18 



{..do 



I. .do 



Adults 

 issued. 



Aug. 



Aug. 



Aug. 



Aug. 



Aug. 



Aug. 



Aug. 



Aug. 



Aug. 



Aug. 



Aug. 



Sept. 



. .do. 



Aug. 



Sept. 



Sept. 



May 



May 



May 



May 



Oct. 



Oct. 



May 



May 



May 



Feb. 



May 



May 



May 



May 



May 



May 



May 



30 

 II 



13 



4° 



9 

 II 



4a 



5" 

 6« 



4« 



5° 

 6a 



ya 



4« 

 13" 

 1 6a 



Number of 

 adults. 



9 I 

 I 

 I 



2 d 



1 9 



2 <? 

 I 9 



1 9 



2 c? 



I 9 



9 I c? 



I 9 



I 9 



I d 



c? 



9 

 9 



X (? 



I 9 



I 9 



I 9 



I c? 



I 9 



<^ 4 9 



c? I 9 



c? 2 9 



3 9 



I c? 



I c? 



1 d 



2 9 

 I 9 

 I 9 

 I cT 

 I c? 



I (? 



Length of 



stage. 



Days. 



24 

 20 



24 

 20 

 21 

 23 

 23 

 18 



248 

 246 

 244 

 245 

 23 

 25 

 23s 

 236 



237 

 1386 

 209 

 210 

 211 

 2X2 

 201 

 208 

 213 



° Adults issued the following year from puparia kept out of doors over the winter. 

 & Adults issued the following year frora puparia kept indoors over the winter. 



An unusuaIv occurrence) with adults. — Twice while working with 

 the adults the writer observed them to issue feet first from the puparium 

 (PI. 28, F). In one case the flly succeeded in freeing itself from the 

 puparium, but the wings never expanded normally. In the second the 

 feet broke through the puparium, but the fly did not stfcceed in work- 

 ing itself free. It will be noticed from the illustration that the fly's feet 

 are extending from the posterior end of the puparium, showing that the 

 pupa was formed in its normal position within the puparium. 



PREDACIOUS AND PARASITIC ENEMIES 



The writer reared two parasites from the puparia of P. calyptrata, 

 Opius quebecensis Prov. , and Dacnusa scaptomyzae Gahan. These were 

 kindly determined by Mr. A. B. Gahan, of the Bureau of Entomology, 

 United States Department of Agriculture. Several times the writer 

 observed the latter parasite ovipositing in the larva of the miner. 



