76 NEW YORK STATE MUSEUM 



APPENDIX 



A STUDY OF GALL MIDGES, VI 



FAMILY ITONIDIDAE 

 TRIBE ITONIDIDINARIAE 



The more characteristic males of this tribe are easily distinguished 

 by the long, slender, thickly haired antennae with 14 or more seg- 

 ments, the flagellate segments usually being binodose and provided 

 with 2 or 3 circumfili, the characteristic loops frequently being 

 greatly produced. The palpi vary from uniarticulate to quad- 

 riarticulate. The third vein may unite with the margin well before 

 the apex as in Arthrocnodax or at or well beyond the wing tip as 

 in many other species. The claws may be simple or toothed. This 

 group presents great and exceedingly interesting variations, not 

 only in antennal but also in genitalic structures, the latter most 

 extreme in certain species. 



Members of this tribe appear to live largely in the more tender 

 leaf or bud tissues though a considerable number are inquilines, 

 while relatively few subsist upon fungus or are zoophagous. 



Key to Genera, Males 



Group I, Bifili 



This group is easily recognized by the presence of but 2 circumfili 



on the flagellate antennal segments of the male, the nodes being 



equal or nearly so. 



a Flagellate antennal segments of the male all binodose 

 h Palpi quadriarticulate 



c Claws on all legs toothed, wings with greatly produced and broadly 



rounded areas posteriorly Erosomyia Felt 



cc Claws of anterior legs toothed, the wings normal, the posterior areas 



not greatly produced T o x o m y i a Felt 



ccc Claws all simple 



d Wings of the male with the posterior area greatly produced and 



broadly rounded Lobopteromyia Felt 



dd Wings normal, neither especially broadened or narrowed 



e Costa thickly clothed with scales, the first antennal segment 



with a dorsal tooth Endaphis Kieff . 



ee Costa not scaled 



/ Third vein interrupting the margin at the apex of the 



wing; ovipositor long, slender. .Contarinia Rond. 



ff Third vein not interrupting the margin at its union with 



costa, ovipositor usually not long 



Thecodiplosis Kieff. 



