372 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 9 



NOTES ON PEGOMYIA HYOSCYAMI PANZ^ 



By E. X. Cory, College Park, Md. 



In 1912 the writer found a plant of lamb's-quarters infested by 

 leaf-miners. These were turned over to Mr. A. B. Gahan for rearing. 

 During the spring and early summer of that year additional miners 

 were found by Mr. Gahan and the writer in lamb's-quarters and 

 spinach. Adults were bred from these specimens and determined 

 tentatively as Pegomyia vidua Lint. In 1914 the writer began 

 rearing miners from Chenopodium album, continuing this work through 

 1915. A large series was secured by the end of that year. 



Specimens of these were submitted to Mr. Knab, of the U. S. 

 National Museum, who determined them as Pegomyia hyoscyami 

 Panz., an European species not heretofore recorded from the United 

 States, Insecutor Inscitiae Menstruus, Vol. 4, Nos. 1-3, p. 1. 



Later upon working over the entire series of specimens reared by 

 Mr. Gahan and the writer from spinach, Chenopodium albuin and 

 Amarantus retrojiexus, the conclusion was reached that they were all 

 Pegomyia hyoscyami Panz. 



Meanwhile Mr. Knab had submitted specimens from the series 

 out of Chenopodium album to Dr. T. Yilleneuve, France, who con- 

 firmed his determination of Pegomyia hyoscyami Panz. 



P. Sorauer in "Handbuch der ■ Pflanzenkrankheiten" places P. 

 hyoscyayni, atriplicis Gour., beks Curt., chenopodii Rond., conformis 

 Fall., dissimilipes Zett., spinacice Holmgr. and vicina Lint, in 

 synonymy. 



The identity of Pegomyia hyoscyami Panz. and P. vicina Lint, is 

 given in Cameron's paper "A Contribution to a Knowledge of the 

 Belladonna Leaf -miner, Pegomyia hyoscyami Panz. Its Life-History 

 and Biology," Annals of Applied Biology, Vol. I, No. I, May 1914, 

 pp. 43-77 inclusive. 



In this paper Mr. Cameron places in synonymy P. hyoscyami Panz., 

 P. atriplicis Gour., P. chenopodii Rond., P. conformis Fall., P. 

 cunicularis Rond., P. effordiens Rond., P. egens Meig., P. exilis Meig., 

 P. gouraldi R.-D., P. hcemorrhoa Panz., P. betce Curt., P. dissimilipes 

 Zett., P. femoralis Brischke., P. spinacia Holmgr. and P. vicina Lint. 



Stein recognizes the light colored, hyoscyami Panz. as the true 

 species and betcB Curt, as a darker variety. Several authors agree 

 that the color of the flies depends to a large extent upon the kind and 

 extent of the larval food. 



Cameron suggests the possibility of "biologic" species within the 



1 Contribution from the Maryland Agricultural Experiment Station. 



