AGROMYZID LEAF MINERS — FRICK 379 



Key to the described species of Phytohia (Cephalomyza) 



1. Mesonotum with two or three well-developed dorsocentral setae; genovertical 



plates dark from vertex to lowest orbital seta (fig. 67) 2 



Mesonotum with four well-developed dorsocentral setae; genovertical plates 

 dark from vertex to upper-orbital, lower-orbitals on yellow (fig. 68) . indecisa 



2. Mesonotum dull black, somewhat pollinose; third antennal segment dark 



brown to black (fig. 67) auriceps 



Mesonotum shining black; third antennal segment yellowish (fig. 66). 



albidohalterata 



Phytohia (Cephalomyza) albidohalterata (Malloch) 



Agromyza albidohalterata Malloch, Psyche, vol. 23, p. 52, 1916. 

 Phytohia (Cephalomyza) albidohalterata (Malloch), Frick, Canadian Ent., vol. 

 85, p. 69, 1953. 



The figure of the head (fig. 66) is of a male from White Heath, 111., 

 because the head of the type male is partially collapsed. This is a 

 shining black species that has the femora narrowly light brown 

 distally and with not more than thi-ee well-developed dorsocentral 

 setae. Phytohia (Cephalomyza) albidohalterata is atypical for this 

 subgenus in having two upper-orbital setae, but only the dorsal is 

 reclinate. There are specimens from Iowa and Illinois. 



Phytohia {Cephalomyza) auriceps (Melander) 



Agromyza auriceps Melander, Journ. New York Ent. Soc, vol. 21, p. 262, 1913. 



A rather large species (2.25 mm. in wing length) that differs from 

 Phytohia {Cephalomyza) albidohalterata in having the third antennal 

 segment dark brown (fig. 67), the mesonotum dull, and the femora 

 entirely dark brown. The type series is from Idaho and Colorado 



Phytohia {Cephalomyza) indecisa (Malloch) 



Agromyza indecisa Malloch, Ann. Ent. Soc. Amer., vol. 6, p. 292, 1913. 



This species (fig. 68) is the most yellow of the three in the subgenus, 

 with the antenna, maxUlary palpus, and most of the genovertical 

 plates being of that color. The femora are brown with yellowish 

 streaks. There is a single specimen, a female from New Mexico. 



5e. Subgenus Poemyza Hendel 



Poimyza Hendel, in Lindner, Die Fliegen der palaearktischen Region, fam. 59, 

 p. 35, 1931. 



The species included in this subgenus were once considered to be very 

 distinctive in having a high lunule laterally constricted by the geno- 

 vertical plates (fig. 78). However, Groschke (1954) described Euro- 

 pean species that have a much lower lunule and modified the key to 

 read: "Height more than one-haLf its width; frontal vitta at least 



472314—59 3 



