FAMILY CECIDOMYID.E THE GALL MIDGES 315 



88. Ventral plate or harpes strongly chitinized Coquillettomyia Felt 



Ventral plate or harpes not chitinized Feltiella Riibsaamen 



89. Terminal clasp seg-ment sub-fusiform, distinctly dilated; harpes 



strongly chitinized and very complex (30) Karschomyia Felt 



Not as above 90 



90. Claws curved at nearly right angles Clinodiplosis Kieffer 



Claws not curved at nearly right angles 91 



91. Ventral plate almost linear, straight and much longer than the dorsal 



plate Acaroletes Kieffer 



Ventral plate not greatly produced Mycodiplosis Riibsaamen 



92. Palpi with fewer than four segments 108 



Palpi with four segments 93 



93. Third vein uniting with the costa behind the apex of the wing 9i 



Third vein uniting with the costa before the apex of the wing. 



Arthrocnodax Riibsaamen 



94. Circumfila with short bows or wanting 95 



Circumfila well developed and not conspicuously irregular, the loops 



mostly as long as or longer than the diameter of the enlargement.. 97 



95. Some of the flagellate antennal segments cylindrical 96 



Flagellate antennal segments binodose in the male or presumably so. 



Caryomyia Felt 



9G. Circumfila rudimentary or wanting; tenth to fourteenth segments 



cylindrical; harpes somewhat inflated Prodiplosis Felt 



Circumfila distinct though low, all the flagellate or only the distal 

 segments cylindrical; ovipositor short Caryomyia Felt 



97. Claws bent at nearly right angles 98 



Claws not bent at right angles 99 



98. Ventral plate long, slender, slightly expanded and roundly emarginate 



apically; dorsal plate short, triangularly emarginate. .Giardomyia Felt 

 Ventral plate long, broad, very deeply and broadly emarginate; dor- 

 sal plate deeply and roundly emarginate Hyperdiplosis Felt 



99. Basal clasp segment lobed 100 



Basal clasp segment not lobed 103 



100. The lobe apical 101 



The lobe basal 102 



101. The lobe very long, cui'\'ed, setose; terminal clasp segment swollen 



basally Epidiplosis Felt 



The lobe triang-ular; terminal clasp segment short, greatly con- 

 stricted near the middle and enormously swollen and recurved 

 apically Metadiplosis Felt 



102. Wings spotted Lestodiplosis Kieffer 



Wings not spotted Coprodiplosis Kieffer 



103. Antennal segments plainly trinodose Obolodiplosis Felt 



Antennal segments not plainly trinodose 104 



Ceeidomyidae VII. — 28, Joannisia phofophila, fifth and teith antennal segments of male • 

 29. Lcptosyna quercivora; ;{0. Karschoinjia viburni, fifth antennal sesment of d: 31. Cincti- 

 cornia transversa, sixth antennal setrment of c ; 32, Corinthomyia cincinna, fourth antennal 

 segment of d ; 33, Schizomyia macrolila, sixth antennal segment of d- 



(Courtesy New York State Museum, Albany, N. Y.) 



