184 The Ottawa Naturalist. [March 



Cincticornia Felt. 

 Antennal segments 14. sessile, the flagellate ones of the 

 male with numerous low, regular eireumhli, those of the female 

 with two to six transverse, anastomosing circumfili; palpi 

 quadriarticulate; terminal clasp segment of the male genitalia 

 transversely and evenly serrate. Ovipositor stout, tapering to 

 subacute, minute lobes. This genus appears to be confined 

 very largely, if not exclusively to oak leaf galls. 



C. pilulae Walsh. Gall reddish brown, coarsely reticulate, 

 thick-walled, irregularly subglobose, about J of an inch in 

 diameter, depressed or fused to form lobulated masses on oak 

 leaves. Described as CeciJomyia querc us- pilulae. 



C. symmetrica O.S. is possibly identical with the above:, 

 It belongs, with very little question, to this genus. Described 

 as Cecidomyia . 



TRIBE ITONIDINARIAE. 



The more characteristic members of this tribe are easilv 

 distinguished by the usually long, thickly haired antennae 

 having 14, rarely 12 segments, the flagellate segments in the 

 male usually binodose, and with two or three circumfili, the latter 

 generally with greatly prodviced loops; palpi uni- to quadri- 

 articulate; claws simple or toothed. This very large tribe 

 includes many diverse forms. 



Group Bifili. 



This subtribe is easily distinguished by the presence of 

 but two circumfili on the flagellate antennal segments of the 

 male; the nodes are equal or nearly so. 



Coxtarixia Rond. - 



The third vein unites with the interrupted costa at the 

 apex of the wing; the palpi are quadriarticulate; the lobes of 

 the dorsal plate taper strongly and are subacute; the ovipositor 

 is long and filiform. 



C. iohnsoni Sling. The small, yellowish larvae occur in 

 deformed grape blossoms. Described as Cecidomyia. 



C. virg.inianiae Felt. The vellowish larvae occur in de- 

 formed, bladder-like fruit of the chokecherry. Described as 

 Cecidomyia. 



C. rumicis Loew. The reddish larvae infest the seeds of 

 Rumex.. An introduced European species. 



C. sorghicola Coq. The yellowish larvae occur in the seeds 

 of Sorghum and related plants. Described as Diplosis. 



C. pyrivora Riley. The vellowish larvae occur in voung 

 pears. Described as Diplosis. 



/9 



