AGROMTZID LEAF MINERS — FRICK 393 



that of the eye (fig. 90), two upper-orbital setae (fig. 89), the hmule 

 low, and the genovertical plates not abruptly raised above the frontal 

 vitta (fig. 88) as they are in species of the subgenus Praspedom.yza 

 (fig. 92). The frontal vitta is usually yellow but when it is dark the 

 abdomen is also dark. A small pair of prescutellar setae may be 

 present. The larvae have three short recurved bulbs on each posterior 

 spiracle. The subgenus Trilobomyza is placed among the more spe- 

 cialized subgenera because of the similarity of the adults to those of 

 the subgenus Praspedomyza. 



One diverse species, Phytobia (Trilobomyza) pleuralis, is included 

 here although it is an example of one that belongs strictly to no one 

 subgenus. However, the adults have more characters in common 

 with species of the subgenus Trilobomyza than with species in the 

 other subgenera. 



Key to the described species of Phytobia (Trilobomyza) 



1. Frontal vitta yellowish; femora j^ellow 2 



Frontal vitta black ; femora dark brown calyptrata 



2. Mesonotum with four dorsocentrals; anepisternum brown, dorsally about 



one-fourth yellow varia 



Mesonotum with three postsutural dorsocentrals; anepisternum yellow. 



pleuralis 



Phytobia {Trilobomyza) calyptrata (Hendel) 



Agromyza nigrisquama Malloch (not Malloch, 1914), Psyche, vol. 23, p. 53, 1916. 

 Agromyza calyptrata Hendel, Konowia, vol. 2, p. 145, 1923. 



This species may be separated from others in the subgenus Trilo- 

 bomyza by the over-all dark brown coloration, particularly tiiat of 

 the frontal vitta and the femora. The head is illustrated to show 

 the subcircular eye (fig. 89). The holotype from Illinois is the only 

 specimen that I have seen. 



Phytobia {Trilobomyza) pleuralis (Malloch) 



Agromyza pleuralis Malloch, Ent. News, vol. 25, p. 311, 1914. 

 Agromyza clara (Melander), Frost, Mem. Cornell Univ. Agr. Exp. Sta., vol. 78, 

 p. 41, 1924. 



Frick (1953a) discussed the subgeneric position of this atypical 

 species, which has more characters in common with subgenus Trilo- 

 bomyza than with any other subgenus. The head has the gena 

 relatively wide (fig. 90). The larvae form serpentine-blotch mines 

 in the leaves of Catalpa spp. At present the known distribution is 

 limited to Illinois and Ohio. 



