A. K. Cameron 45 



characters of P. /n/osci/anii with those of Pqjonn/id bicolor Wied. and 

 of Pegoniyia nigrilarsis Zett. The results of this coniparisoji have 

 been incorporated in this paper. The research was carried out in the 

 Laboratories of the l)ej)artnient of Agricultural EntonioIof;v, Victoria 

 University, and in the Experimental Laboratory, Fallowfield. It alfords 

 me great pleasure to express my gratitude to Professor S. J. Hickson 

 for the various facilities readily granted to me, to Dr A, D. Imnis for 

 many useful suggestions made when the work was approaching com- 

 pletion and to Mr J. T. Wadsworth, who photographed the specimens 

 for text-figures 2, 3 and 4. 



2. Synonymy of the Species and Nomenclature of the Genus. 



The Katalog der PaldarJcdschen Dipteren gives the following list of 

 names w^hich at one time or another were supposed to apply to valid 

 species, and are included therein as synonyms of P. hyoscyami. 



P. hyoscyami Panz., P. atriplicis Gour., P. chenojmdii Rond., P. con- 

 formis Fall., P. cunicularis Rond., P. effodiens Rond., P. egens Meig., 

 P. exilis Meig., P. Gouraldi R,-D., P. haemorrhoa Pand. 



Var. Pegomyia betae Curt., P. dissimilipes Zett., P.femoralis Brischke, 

 P. spinacia Holmgr. 



In America, Lintner, in 1881, described the species under the name 

 of Pegomyia vicina. 



The generic name has not remained constant and the species has 

 been included by various authors at various times in the genera Musca 

 (Panzer, Fallen), Anthomyia (Meigen, Schiner, Rondani), Anthomyza 

 (Zetterstedt), and Chortophila (Rondani). According to Stein (1905), 

 Robineau-Desvoidy in his paper on the Myodaires (1830, 595) estab- 

 lished the tribe Pegomyidae for a number of Muscidae which are dis- 

 tinguished from the Anthomyiidae by the more or less red colouration 

 of the body, by the small squamae and because in the larval stage they 

 subsist on the parenchyma of leaves. Rondani did not assume the genus 

 Pegomyia, but from a consideration of the size of their squamae he 

 disposed of the species in the genera Anthomyia and Chortophila. Meade 

 in 1883 re-adopted the name Pegomyia including under it all Antho- 

 myiids with naked, or at least pubescent antennary bristle, with the 

 anal vein continued to the wing margin and with partly red colouration 

 of the legs and abdomen. His species are classified into two sections, 

 in the first of w^hich there are four included, P. betae, P. conformis, 

 P. hyoscyami and P. haemorrhoum, the last of Zetterstedt. The first 



