AMERICAN J.F:PII)0PTKRA. 289 



plant. In the Murtfeldt collection are specimens bred from grape- 

 berry, seeds of Ambrosia trifida and seeds of Rhus. 



Prof. Slingerland's investigations into this subject have resulted 

 in abundant series of the fall or grape-berry brood, the first spring 

 brood on the flowerets and recently set grapes and the middle brood 

 in the green grape berries. Prof. Slingerlaud h^s been successful in 

 discovering and breeding considerable series of both, the mid sum- 

 mer and fall brood on the American wild-grape, which specimens 

 compare exactly with viteaiia. In my own collection are specimens 

 bred from Liriodendron, Vernoiiia, Eupatorium and swamp mag- 

 nolia. 



After critical examination of all this material, over 100 speci- 

 mens, I feel very positive that each of the food plants support a 

 good valid species, that the different broods do not affect different 

 plants, but that the entire circle of each species is confined to a sin- 

 gle plant. This is particularly well illustrated by Prof. Slingerland's 

 work, and in a very much smaller way by my own. In Staudinger's 

 and Bang-Haas Catalogue are twenty species under thife genus; we 

 have been satisfied to lump all of ours under one name and that a 

 foreigner. 



For want of sufficient material I do not projDose to make as many 

 species as we have recorded food plants in this paper, but hope at 

 some later time to be in possession of good series from all the broods 

 from each plant, which will warrant such separation. 



POL.YCHROSIS Ragonot. 



Pulychroi<is, Rag. Ann. Sue. Eut. France, Isiii, 208, 1894. 



Polychrosis, Rag. Stand, and Rebel Catalog Lep. des Pal. Faun, ii, 109, 1901. {KfiyyV S f\ •'V^Ulf 



Polychrosis, Rag. Fern. Bull. No. 52, U. S. N. M. 449, 1902. ■ ^"^ 



Autennse in % shortly ciliated, palpi short, do not extend beyond face, outer 

 joint very short, obtuse, tufts on second joint closely compressed, truncate. 

 Thorax with bifid, posterior crest, loosely scaled. 



Forewiug: — Costa evenly arched, apex rounded, outer margin oblique, very 

 slightly rounded ; lb strongly furcate at base ; Ic reaching to and almost concur- 

 ring with 2; 2 arising from three-quarters of cell ; 3 and 4 not connate but aris- 

 ing closer together than 4 and 5 ; 3 bent sharply and 4 slightly downward beyond 

 origin ; 5, 6 and 7 arising at equal distances; 4, 5, 6 and 7 to margin at nearly 

 equal distances apart; 7 to margin below apex, 8 and 9 arising close but not con- 

 nate; 10 and 11 widely separated from each other and 9. 



Hindwing: — With frenulum; uncas not developed ; median vein hairy above 

 near base^ costa slightly arched to middle, slightly sin^te beyond ; apex 

 rounded ; outer margin slightly rounded ; dorsum same but sinuate between lb 



TEANS. AM. KNT. SOC. XXX. (35) NOVEMBER. 1904. 



' ( 



