margin slightly darker; meaningful illustration of 
male genitalia aedeagus not possible with available 
material; sperm pump with long, narrow blade; 
hypandrium (fig. 864) broadened and with membranous 
lateral extension at midpoint. 
Host/Early Stages. Philoxerus vermicularis . Larva 
forming mine deep within leaf, preparing exit hole 
and then pupating some distance back in mine; pupar- 
ium white, thin walled, posterior spiracles each 
with ellipse of 10-12 minute bulbs. 
Distribution. Florida. 
References. Spencer and Stegmaier, 1973: 112; 
Steyskal, 1980: 150. 
Surstylus with 2-4 teeth very close together (figs. 
862, 866) 4 
4 (3). Surstylus with 2 or 3 teeth (fig. 866); hypandrium 
with narrow lobe at base (fig. 867) H. minutus (Frost) 
Synopsis. Agreeing closely on external characters 
with H. philoxeri , not reliably distinguishable; 
male genitalia with aedeagus having distiphallus 
extended as narrow tubule (figs. 868, 869); sperm 
pump long, narrow (fig. 870). 
Host/Early Stages. Amaranthus species, Chenopodium 
species. Larva forming initial linear mine, which 
normally develops later into irregular blotch; pu- 
parium pale yellowish brown, posterior spiracles 
each with ellipse of 9-12 minute bulbs. 
Distribution. California, Florida, North Dakota, 
Texas; Canada. 
References. Spencer, 1969a: 201 (as Haplomyza 
togata ) ; Spencer and Stegmaier, 1973: 112 (as Haplo- 
myza minuta ); Steyskal, 1980: 148. 
Surstylus with 4 closely adjoining teeth (fig. 
862); hypandrium with broad lobe at base (fig. 861)- 
H. kef i Steyskal 
(Mesonotum normally yellow adjoining scutellum, see 
couplet 1.) 
Genus Calycomyza Hendel 
Dizygomyza ( Calycomyza ) Hendel, 1931: 
65. Type of subgenus: Agromyza 
artemisiae Kaltenbach, 1856 (Europe). 
Phytobia (Calycomyza) Frick, 1952a: 
394. 
Calycomyza Nowakowski, 1962: 97. 
This genus is characterized by having 
the frons and notopleural area yellow 
and the scutellum entirely black. The 
only known exception is Calycomyza 
obscura, in which both frons and 
notopleuron are dark, but its correct 
generic position is indicated by the 
male terminalia. The aedeagus itself 
in this genus shows some variation, 
with the distiphallus normally short 
and compact (figs. 875, 881), more 
rarely with extended tubules (figs. 
900, 933). However, a consistent 
generic character in the terminalia is 
the presence of a patch of strong 
bristles on the inner hindcorner of 
the epandrium (fig. 924). 
Identification of many species is 
virtually impossible on external 
characters, but they can normally be 
140 
