'flit ■'^tcc^o- 



Hiillctin of the Bnwklyii Eiiloiiioloiiical Society 



On the tropical American Rhipidiae Tipulidae, Dipt.) 

 By Chas. p. ALEXANDiiR, llhaca, N. Y.* 



The genus Rliipidia Meigen, remarkable in the j)osscssion of 

 strongly pectinated antennae in the males of many sjjccics, reaches 

 its maximum of specific de\-clo]5mcnt in the trojjics of the Xew 

 World. 



I have before mo over fifty specimens of American Rhipidiae, 

 ' ferable to ten species, all of the described fonns being included 

 excepting bipectinata Will., costalis Will., bryanti Johns., tabescens 

 End., and typical subpectinata Will. The types of bryanti arc in 

 Boston, and through the kindness of Mr. C. W. Johnson I was 

 able to examine them in December, 1911. In addition to the 

 hitherto known forms, I find among the material four new species 

 and three additional varieties which are characterized in this 

 paper. 



All of the known Rliipidiac are referable to llirec main groups, 

 which seem to be equivalent to subgenera, based on the structiu'e 

 of the male antennae. 



(1) The subgenus Rhipidia, constituting the maculata 

 group with bipectinate antennae, including the type of the genus, 

 maculata Meig., and bipectinata Will., costalis Will., calverti sp.nov., 

 craiHptonisp. nov., and probably 6rja)t/f Johns., and tabescens End., 

 these latter kno\\Ti only from the females. 



(2) The subgenus Alonorhipidia subg. nov., constituting the 

 iiseriata group, with unipcctinate antennae, including fidelis 



' '~ten-Sacken, and unipectinata Will. 



(3) The subgenus Arhipidia subg. nov., constituting the dom- 

 tica group, with subpcctinated antennae, including two subgroups, 



•Contribution from the Entomological Laboratory, Cornell University. 



