658 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiu. 



Tipuloidea and Bibionoidea correspond to Osten Sacken's recently 

 proposed divisions, Xemoeera vera and Xemoeera anomala, respectively, 

 while the Tabanoidea are equivalent to his Eremocliaeta^ with the 

 addition of the families Acroceridae and Nemestrinidae. 



Osten Sac ken, to whom the science owes so much in bringing about 

 a more rational arrangement of the Orthorhapha, has suggested the 

 merging of the old families, Xylophagidae and Coenomyidae, with 

 the Leptidae, a suggestion since put in operation by Dr. Williston; 

 the three groups appear to be altogether too closely related with each 

 other to be maintained as distinct families. 



The recently proposed famil}-, Eretmopteridae, of Kellogg, does 

 not appear to be sufficiently distinct from the family Chironomidae 

 to be maintained; it was founded on a degraded form related to the 

 genus CJiasmatonotus Loew, but apparently more closely related to the 

 short- winged genus Smlttla Holmgren, from Spitsbergen, both of 

 which have been referred ]\v their authors to the Chironomidae. 



Pupipara is a later term for, and therefore a synonym of, Eprobos- 

 cidea. 



