REPORT OF THE STATE ENTOMOLOGIST 1918 221 
with three circumfila though two aberrant Species, namely T- 
elarkei Felt and T. verruca Walsh have but two circumfila. 
There is a distinct tendency toward a prolongation of the ovipositor, 
this organ in Trishormomyia being rather to moderately long, 
T. helianthi Brodie showing the maximum development. 
It is possible that further rearings, particularly of the larger forms 
placed in Hormomyia H. Lw., will result in a somewhat revised 
grouping of these species. 
Key to Species 
Males 
a Antennae composed of 15 segments, the fifteenth rudimentary 
b Palpi biarticulate 
c Second palpal segment moderately long, stout 
d Abdomen dark brown, the eighth segment mostly yellowish, the 
fifth antennal segment having stems with a length three- 
fourths and as long as their diameters respectively........... 
consobrina Felt, C. 1204 
ce Second palpal segment very long, slender, with a length about ten 
times its diameter 
d Abdomen fuscous yellowish, the fifth antennal segment having 
stems one and one-half and two and one-half times their 
diameters respectively............. saturni Felt, C. 1493 
dd Abdomen pale yellowish, the fifth antennal segment having stems 
with a length one and one-half and one and one-fourth times 
their diameters respectively........... shawi Felt, C. 1423 
ddd Abdomen dark brown, the fifth antennal segment having stem, 
nearly equal, each with a length one-half greater than the 
Glieuaa ye Here PNR ots a Pee ese fenestra Felt, C. 1596 
aa Antennae composed of 14 segments 
b Palpi triarticulate 
c¢ Abdomen shining black, length 5 mm; fifth antennal segment with 
stems one and one-half and equal their diameters respectively. 
Ventral plate spatulate and almost truncate.........---..+++-5 
johnsoni Felt, C. Sar 
cc Abdomen dark red; length 4 mm; fifth a1.tennal segment with stems 
one and one-half and one and one-fourth times their diameters 
respectively; ventral plate short, broad, roundly emarginate. 
Reared from cockscomb gall on crataegus leaves.........--+-+-- 
crataegifolia Felt, C. a1362 
ccc Abdomen dark brown; length 3 mm; fifth antennal segment stems 
each with a length one-half greater than the diameter; ventral plate 
broad, broadly emarginate..........-- dilatatam. spy C407 
ccce Abdomen dark reddish brown; length 1.5 mm; flagellate antennal 
segments with stems one and one-fourth and one and one-half 
times their diameters respectively; ventral plate short, broadly 
EOUITIG CGP ore sect one sc icic Sole ierenerovaieteielst avers bulla Felt, C. 1267 
