FAMILY CECIDOMYID.E THE GALL MIDGES 117 



104, Antennal segments short, thick, the stems transverse, the enlarge- 



ments short and broad; circumfila fine, rather short, each with 



about twenty loops Retinodiplosis Kieffer 



Antennae of normal form 105 



105. Ventral plate linear or long and spatulate 10^ 



Ventral plate broad and broadly or triangularly emarginate 107 



lOG. Ventral plate linear, rounded apically; dorsal plate shorter than the 



ventral, the lobes truncate Parallelodiplosis Riibsaamen 



Ventral plate spatulate, the dorsal plate moderately long, deeply and 

 triangularly emarginate, the lobes broad, obliquely and roundly 

 emarginate Hypodiplosis Kieffer 



107. Dorsal plate deeply incised, the lobes narrowly rounded; terminal 



clasp segment with serrate margin Paradiplosis Felt, 



Dorsal plate not incised or very narrowly emarginate; terminal clasp 

 segment smooth (3) Cecidomyia Meigen 



108. Palpi with three segments 100 



Palpi with only one or two segments ll-» 



109. Circumfila with short bows or loops, their length being one-half the 



diameter of the enlargement or less 110 



Circumfila loops with a length equal to the diameter of the enlarge- 

 ment or longer s H- 



110. Thorax plainly extending over and concealing the head to a certain 



extent ....". Hi 



Thorax not produced over the head to a marked degree. .Caryomyia Felt 



111. Males with fifteen to at least twenty-seven antennal segments; female 



with fourteen or more antennal segments; ovipositor short (4). 



Hormomyia Loew 

 Male and female with fourteen or fifteen antennal segments, the 

 fifteenth rudimentary; ovipositor moderately long. 



Trishormomyia Kieffer 



112. Basal clasp segment lobed Odontodiplosis Felt 



Basal clasp segment simple Adiplosis Felt 



113. Palpi with two segments Dishormomyia Kieffer 



Palpi with one segment 114 



114. Wings hyaline 115 



Wings marked with black and yellow Astrodiplosis Felt 



115. Fourteen antennal segments in both sexes 11*3 



Thirteen segments in female, the third and fourth fused, the basal 



and distal nodes in the male flagellate antennal segments globose 

 and ovoid respectively; dorsal and ventral plates bilobed; ovipositor 

 short, chitinous, aciculate Cystodiplosis Kieffer & Jorg 



116. Both dorsal and ventral plates deeply emarginate; ovipositor short, 



chitinous, falcate Monarthropalpus Riibsaamen 



Ventral plate not deeply emarginate 117 



117. Dorsal plate deeply and ventral plate broadly emarginate; ovipositor 



stout, half as long as the abdomen, the distal part thickly clothed 



with long, silky hairs Onodiplosis Felt 



Dorsal plate deeply, broadly and roundly emarginate, the lateral 

 margin extended ventrally; ventral plate broadly emarginate; ovi- 

 positor stout, about two-thirds as long as the abdomen. 



Horidiplosis Felt 



