A REVISION OF THE TWO-WINGED FLIES OF THE GENUS 

 PROCECIDOCHARES IN NORTH AMERICA, WITH AN 

 ALLIED NEW GENUS 



By J. M. Aldrich 



Associate Curator, Division of Insects, United States National Museum 



Besides adding three new species and one variety to the genus, 

 the present paper includes several rearing records, some of which have 

 been awaiting publication for more than 40 years. It also corrects an 

 erroneous record which has been a source of confusion for many years. 



I am under obligation to Prof, H. B. Hungerford, of the University 

 of Kansas, and Prof. R. L. Webster, of Washington State College, 

 for the privilege of examining type material; and to Mr. Nathan 

 Banks, of the Museum of Comparative Zoology, Cambridge, Mass., 

 for careful notes on the types in that institution. Prof. A. L. Melander 

 sent me his collection, which contained the only specimen I have seen 

 of Procecidochares penelope. Dr. F. R. Cole sent his material for 

 study, and Mr. E. P. Van Duzee sent that of the California Academy 

 of Sciences. Dr. R. D. Glasgow sent for examination the specimens 

 which Doctor Felt had recorded from Utah. The Vienna Natural 

 History museum also sent for examination its only specimen of 

 Oedaspis multifasciata Loew, for which I am especially indebted to 

 custodian H. Zerny. Prof. Fr. Hendel kindly pointed out to me a 

 series of differences between this species and our American forms. 



Genus PROCECIDOCHARES Hendel 



Procecidochares Hendel, Wien. Ent. Zeitschr., vol. 33, 1914, (April 30), 

 p. 91; Abh. Ber. Konigl. Zool. Anthr-Ethnog. Mus. Dresden, vol. 14, 

 1914 (June 15), pp. 41, 42. — Bezzi, Broteria, ser. zool., vol. 18, 1920, 

 p. 7.— Phillips, Journ. N. Y. Ent. Soc, vol. 33, 1923, pp. 122, 136. 



The type species was designated by Hendel in the first paper above 

 as Trypeta atra Loew, a North American species which has until 

 recent years been referred to Oedaspis, the genotype of which is Trypeta 

 multifasciata Loew, a rare European species. This has the antennae 

 far apart, the front very wide and not narrowed anteriorly, and still 

 other differences from the group herein considered. Cecidochares^ is 



1 Bozzi, Boll. Lab. Zool. Portici, vol. 5, 1910, p. 20. 



No. 2799.— Proceedings U. S. National Museum, Vol. 76, Art. 2. 



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