REPORT OF THE STATE ENTOMOLOGIST 1918 221 



with three circumiila though two aberrant species, namely T- 

 c 1 a r k e i 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 



cc 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 stemg 

 nearly equal, each with a length one-half greater than the 



diameter fenestra Felt, C. 1595 



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 



johnsoni Felt, C. 821 



cc Abdomen dark red; length 4 mm; fifth aiitennal segment with stems 



one and one-half and one and one-fourth times their diameters 



respectively; ventral plate short, broad, roundty emarginate. 



Reared from cockscomb gall on Crataegus leaves 



crataegifolia Felt, C. ai362 



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 d i 1 a t a t a n. sp. C. 407 



cccc Abdomen dark reddish brown; length 1.5 mm; fla,gellate antennal 

 segments with stems one and one-fourth and one and one-half 

 times their diameters respectively; ventral plate short, broadly 

 rounded bulla Felt, C. 1267 



