REPORT OF THE STATE ENTOMOLOGIST I907 403 



cccc Ventral plate broadly rounded apically 



d Dorsal plate short, deeply and narrowly incised, the lobes broadly 

 rounded; 5th antennal segment having the basal portion of the 



stem with a length 3^ times its diameter 



(Cecidomyia) acarivora Felt, C. 847 



PRODIPLOSIS n. g. 



This genus is erected for the reception of certain small forms 

 which display, in a most interesting manner, the transition between 

 the typical binodose antennae of the male Diplosid and the cylindric 

 stemmed antennae of Rhopalomyia. The circumfili are rudimentary 

 or wanting. The third to ninth segments are distinctly binodose, 

 the eighth and ninth only slightly so, whjle the loth to the 14th 

 are cylindric. The claws are simple. The third vein unites with 

 the wing margin well beyond the apex. The genitalia are peculiar, 

 in that the harpes are somewhat inflated. 



Type C e c i d omy i a f lor i col a Felt, C. ai68i. 



Apparently the same species has been, bred from enlarged blos- 

 soms of clematis under the number ai694. 



ARTHROCNODAX Rubs. 



This genus comprises a number of small, yellowish forms having 

 simple claws and most easily recognized by the third vein uniting 

 with the costa well before the apex. It is probable that most of the 

 species are zoophagous, though A. a p i p h i 1 a is known to subsist 

 upon organic debris in beehives. 



Key to species 



a Ventral plate broadly rounded apically 

 b Ventral plate long, rather narrow 



c Dorsal plate short, deeply and narrowly incised 

 d Stems of 5th antennal segment nearly equal, each with a length 



thrice the diameter; abdomen orange brown, length .75 mm 



(Cecidomyia) incisa Felt, C. 67 



dd Fifth antennal segment with the stems subequal, each with a length 



2^ and 4 times the diameter; abdomen dark carmine with a 



fuscous spot, length 1.2 mm 



(Cecidomyia) sylvestris Felt, C. ai630 

 cc Dorsal plate long, broadly and triangularly emarginate 



d Fifth antennal segment with the stems nearly equal, each with a 

 length 2^ and 3 times the diameter; abdomen dark red, length 



I mm r u f a n. sp., C. 678 



bb Ventral plate long, rather broad 



c Dorsal plate broadly and triangularly emarginate 



