1912] The Ottawa Naturalist. 185 



C. seligera Lintn. Reared from small, irregular, subovate, 

 downy galls on muskmelon*. Described as Diplosis. 



Thecodiplosis Kieff. 



Separated from Contarinia by costa not being interrupted 

 at its union with the third vein and by the long, broadly lobed 

 dorsal and ventral plates in connection with the stout, usuallv 

 very long ovipositor. 



T. ananassi Riley. Reared from a brown gall with a length 

 about | of an inch on Cypress twigs. Described as Cecidomyia 



c it press i-auanassi. 



T. liriodendri O.S. A circular blister on tulip leaves. It has 

 a dark brown center surrounded by a light brown, irregular area; 

 diameter \ inch. Referred to Cecidomyia and Diplosis. 



Group Trifili. 



This subtribe is easily recognized by the presence of three 

 usually well developed circumfili on the flagellate antennal 

 segments of the male. The nodes are generally unequal and in 

 some extreme forms the distal enlargement is almost divided. 



Youngomyia Felt. 

 Flagellate antennal segments of the male trinodose, the 

 distal enlargement being distinctly divided and sometimes by 

 an appreciable stem; palpi quadriarticulate; wings large, rather 

 hairy, the third vein uniting with costa well beyond the apex 

 of the wing; legs long, claws stout, unidentate, the pulvilli 

 about half as long as the claws. The terminal clasp segment 

 of the male is unusually long; the ovipositor of the female is 

 short, the lobes large and orbicular. 



Y. umbellicola O.S. The yellowish larvae occur in enlarged 

 blossoms of elder. Described as Cecidomyia. 



Aphidoletes Kieff. 



This genus is easily recognized by the greatlv produced 

 setae and circumfili on the dorsal surface of the flagellate anten- 

 nal segments in the male. It is readily separated from the 

 allied Bremia by the well developed middle circumfilum. 

 Anterior claws unidentate. 



.4. cucumeris Lintn. Reared presumably from plantlice on 

 cucumber. Described as Diplosis. 



Clinodiplosis Kieff. 



Antennal segments 14, binodose, Palpi quadriarticulate. 

 The terminal clasp segment is not abnormally produced or sub- 

 fusiform. The ventral plate is produced, emarginate, the dorsal 



