AMERICAN DIPTERA. 179 



THE HYPOPYGIIJM OF THE TIPIJEID^E. 



by Robert e. snodgrass, Stanford University, California. 



TABLE OP CONTENTS. 

 INTRODUCTION. 

 Genus Antocha. 

 Genus Dicranomyia. 

 Genus Limnobia. 



Genera Bhamphidia and Dicranoptycha. 

 Genera Erioptera and Symplecta. 

 Genus Limnophila. 

 Genus Epiphragma. 

 Genus Eriocera. 

 Genus Amalopis. 

 Genus Phalacrocera. 

 Genera Ptychoptera and Bittacomorpha. 

 Group Tipulina. 



Genus Pachyrrhina. 



Genus Tipula. 

 Group I. 

 Group II. 

 Group III. 



Genus Ctenophora. 

 SUMMARY. 

 EXPLANATION OF PLATES. 



INTRODUCTION. 



The material from which this paper has been prepared is a large 

 collection of Tipulidse, belonging to the Biology Department of the 

 Washington Agricultural College. The collection was classified and 

 arranged by Mr. R. W. Doane, formerly assistant entomologist at 

 the College and Experiment Station, and contains the types of Mr. 

 Doane's new species of Tipulidse published in several papers. The 

 names used in the present paper are according to Mr. Doane's iden- 

 tifications. 



In two other papers* on Dipteran hypopygiums, the writer has 

 restricted the application of the word hypopygium to the ninth ab 

 dominal segment only. The same usage will be adhered to in this 



* Psyche, vol. ix, pp. 339, 400. — The Inveiled Hypopygium of Dasyllis and 

 Laphria; and Proc. Cal. Acad. Sci. (MS.). — The Hypopygium of the Dolichopodidse. 



TBANS. AM. ENT. SOC. XXX. JUNE. 1904. 



