6 Bulletin of the Brooklyn Entomological Society yd. vm. 



Professor C. H. Peck states that the papaw {Asimina triloba), 

 on which the larva of ajax feeds, has not been found in this 

 region. The capture of the two specimens of this butterfly is there- 

 fore of botanical interest, as indicating the possibility of a station 

 for the papaw in the North Elba region. 



We wish to take this opportunity of thanking Professor Peck 

 for naming our plants. 



On the tropical American Rhipidiae (Tipulidae, Dipt.) 



By Chas. p. Alexander, Ithaca, N. Y.'*" 

 The genus Rhipidia Meigen, remarkable in the possession of 

 strongly pectinated antennae in the males of many species, reaches 

 its maximum of specific development in the tropics of the New 

 World. 



I have before m over fifty specimens of American Rhipidiae, 

 referable to ten species, all of the described forms being included 

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

 End., and typical subpectinata Will. The types of bryanti are 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 Rhipidiae are referable to three main groups, 

 which seem to be equivalent to subgenera, based on the structure 

 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., calvertisp. nov., 

 cramptonisp. nov., and probably bryanti Johns., and tabescens End., 

 these latter known only from the females. 



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

 uniseriata group, with unipectinate antennae, including fidelis 

 Osten-Sacken, and unipectinata Will. 



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

 estica group, with subpectinated antennae, including two subgroups, 



*Contribution from the Entomological Laboratory, Cornell University. 



