REPORT OF THE STATE ENTOMOLOGIST I907 405 



ADIPLOSIS n. g. 



This genus is easily distinguished from Odontodiplosis Felt, to 

 which it is closely^ related, by the stouter basal clasp segment and 

 the total absence of teeth on the ventral plates or harpes. 



Type and sole species Cecidomyia toxicodendri Felt, 

 C. 263. 



HYPERDIPLOSIS n. g. 



This genus is erected for a form with simple claws bent at right 

 angles and with a very long, broad, and very deeply and broadly 

 emarginate ventral plate. The dorsal plate is deeply and roundly 

 emarginate, the lobes being broadly emarginate and with the lateral 

 angles greatly produced. 



Type and sole species Cecidomyia lobata Felt, C. 132. 



GIARDOMYIA n. g. 



This genus is erected for certain species doubtfully referred to 

 Octodiplosis Giard. These forms, however, present marked differ- 

 ences from the type of this older genus and a new genus has there- 

 fore been founded. 



The genus Giardomyia comprises a number of small, yellowish or 

 reddish forms having the simple claws bent almost at right angles 

 and usually somewhat enlarged subapically. The ventral plate is 

 long, slender, slightly expanded apically and roundly emarginate, 

 while the dorsal plate is short, triangularly emarginate and with 

 the somewhat long lobes broadly rounded or even truncate. The 

 type species isG. photophila Felt [pi. 38, fig. 2] . 



Key to species 



a Abdomen yellowish 



b Abdomen pale yellowish 



c Length .75 mm, the 5th antennal segment having the stems 2^ and 

 2,1/2 times their length ; presumably bred from a pustulate gall on 



Mentha m e n t h a e n. sp., C. ai578b, 536 



hh Abdomen fuscous yellowish, length i mm ; 5th antennal segment having 



the stems 3 and 4^2 times the length of their diameters 



noveboracensis n. sp., C. I97x 

 aa Abdomen reddish 



h Abdomen bright carmine, length i mm; 5th antennal segment having 



the stems 3 and 4^/2 times the length of their diameters 



(Cecidomyia) photophila Felt, C. ^22 



hh Abdomen bright red ; terminal segments yellowish, length i nun ; 5th 



antennal segments having the stems with a length 3 and 3^ times 



their diameters, the ventral plate deeply and narrowly emarginate. . 



emarginata n. sp., C. 446 



