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 1, Bafila 
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 
b Palpi quadriarticulate 
c Claws on all legs toothed, wings with greatly produced and broadly 
Founded areas pPOStenorly a. eee eerie Erosomyia Felt 
cc Claws of anterior legs toothed, the wings normal, the posterior areas 
TAOVE AMEND [MOCO a oon25cccgescecncobucwe Toxomyia Felt 
ccc Claws all simple 
d Wings of the male with the posterior area greatly produced and 
broadlyzromundec eer ee ere Lobopteromyia Felt 
dd Wings normal, neither especially broadened or narrowed 
e Costa thickly clothed with scales, the first antennal segment 
with ardorsalitooths, crs neem Endaphis Kieff. 
ee Costa not scaled 
f 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: =. 5..40 Sees 
Thecodiplosis Kieff. 
