REPORT OF THE STATE ENTOMOLOGIST KJOy 4O3 



cccc Ventral plate brcadly rounded apically 



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

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



stem witli a length 3I/2 times its diameter 



(C e c i d o m y i a ) a c a r i v o r a Felt, C. 847 



PEODIPLOSIS 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 Diplcsid and the cylindric 

 stemmed antennae of Rhopalomyia. The circtimfili are rudimentary 

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

 the eighth and ninth only slightly so, while 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 o my i a floricola Felt, C. ai68i. 



Apparently the same species has been bred from enlarged blos- 

 soms of clematis under the number 31694. 



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. apiphila 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) s y 1 v e s t r i s Felt, C. a 1630 

 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 



bh Ventral plate long, rather l>road 



c Dorsal plate broadly and triangularly emarginate 



