REPORT OF, THE STATE ENTOMOLOGIST 1907 403 
cece 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 
Simin Within 2 llemsiln BA wines iis Ghiewrster, .55505000cbanneeodecs 
(Cecidomyia) acarivora Felt, C. 847 
PRODIPLOSIS pn. 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 aré rudimentary 
or wanting. The third to ninth segments are distinctly binodose, 
the eighth and ninth only slightly so, while the roth 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. 
lype CeCidomyia wloricoOla IWely Cy awe. 
Apparently the same species has been bred from enlarged blos- 
soms of clematis under the number a1694. 
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) imeisa Wek, C. Oo 
dd Fifth antennal segment with the stems subequal, each with a length 
2% and 4 times the diameter; abdomen dark carmine with a 
TMSCOUS SDOt, LeMEths 14 STIS oboolos o deco en saeco see orice eee 
(Ceecidomyia) swilwestris lek, G anogo 
cc Dorsal plate long, broadly and triangularly emarginate 
d Fifth antennal segment with the stems nearly equal, each with a 
length 21% and 3 times the diameter; abdomen dark red, length 
if SOMME 5.2 Ao ABO RO oe ere gE era mM, Sp. C. G78 
bb Ventral plate long, rather broad 
¢ Dorsal plate broadly and triangularly emarginate 
