AMERICAN DIPTERA. 179 



THE HYPOPYGIIIM OF THE TIPUL,ID.«. 



BY ROBERT E. SNODGRASS, Staufortl University, California. 



TABLE OP CONTENTS. 

 INTRODUCTION. 

 Genus Antocha. 

 Geuiis Dicranomyia. 

 Genus Limnobia. 



Geuera Rhamphidia aud Dicranopfycha. 

 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. 

 Gruup II. 

 Group III. 



Genus Ctenophora. 

 SUMMARY. 

 EXPLANATION OF PLATES. 



INTRODUCTION. 



The luaterial from which thi.s paper has been prepared is a large 

 collection of TipulidiB, belonging to the Biology Department of the 

 Washington Agricultural College. The collection was classified aud 

 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 Tipulidre 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 



* Psyclie, vol. is, pp. 339, 400. — The Inveiled Hypopygium of Dasyllis and 

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



TRANS. AM. ENT. SOC. XXX. JUNE. 1904. 



