1912] The Ottawa Naturalist. 187 



H. verruca Walsh. Gall a characteristic subconic enlarge- 

 ment arising in clusters from the midrib or some of the principal 

 veins of willow leaves. It is about .1 of an inch in diameter, 

 greenish yellow, monothalamous, subglobular and tapering to 

 a truncate, frequently lipped, free extremity. Not a tvpical 

 Hormomyia. Described as Cecidomyia. 



Lestodiplosis Kieff. 



Usually yellowish, frail species with spotted wings, most 

 easily recognized by the triangular lobe at the internal basal 

 angle of the basal clasp segment of the male. 



L. grassator Fyles. The pale orange larvae prey upon 

 Phylloxera. Described as Diplosis. 



Parallelodiplosis Rubs. 



Mostly pale yellowish or orange species, distinguished 

 by the long, narrowly rounded ventral plate of the male geni- 

 talia. 



P. caryae Felt. Reared from several hickory leaf galls 

 and probably an inquiline with various species of Caryomyia. 

 Previously referred to Cecidomyia and Clinodiplosis. 



Obolodiplosis Felt. 

 A large form remarkable for the greatly expanded orbicular 

 dorsal plate of the male. 



0. robiniae Hald. The larvae occur in marginal leaf rolls 

 of Robinia. Described as Cecidomyia; also as 0. orbiculata. 



Itonida Meign. 



Antennal segments 14, those of the male binodose, the 

 nodes unequal; circumfili three. Palpi quadriarticulate. The 

 third vein unites with the margin well beyond the apex of the 

 wing. The pul villi are longer than the simple claws, while the 

 dorsal and ventral plates of the male genitalia are deeply bilobed. 

 Ovipositor rather long, the lobes narrowly oval. 



/. tritici Kirby. The orange larvae develop in the heads 

 of wheat and some other grains. Widely known as the wheat 

 midge. Previously referred to Cecidomyia and Diplosis. 



1. verbenae Beutm. The larvae occur in terminal rolled 

 leaves of white or nettle-leafed Vervain. Described as Cecidom- 

 yia. 



I. catalpae Comst. The yellowish larvae attack the pods 

 and frequently deform the young shoots of Catalpa. Previously 

 referred to Diplosis and Cecidomyia. 



I. tecomiae Felt. The pale yellowish larvae roll the leaves 

 of the trumpet vine. Previously referred to Bremia and Ceci- 

 domyia . 



