Stegmaier, 1973). In California, 18 
described species were recorded and 3 
more were tentatively diagnosed from 
females (Spencer, 1981). Many other 
species await discovery. 
Key to Agromyza 
Species 
1. Mesonotum with 3 to 6 dc significantly decreasing 
in size, presutural ones when present little 
longer than acr 2 
- Mesonotum with 3+1 dc, presutural not significant- 
ly weaker than 3d 33 
2 (1). 3d antennal segment pale, yellow or orange brown 3 
- 3d antennal segment dark, black or brownish black — 8 
3 (2). Legs largely black 4 
Legs largely yellow 5 
4 (3). Mesonotum matt gray A. sulfuriceps Strobl 
Synopsis. Frons yellow below, black above together 
with orbit; 3d antennal segment (fig. 349) small, 
round, bright yellow; mesonotum matt gray, with 
3+0 dc, occasionally small presutural present; 
legs black, only foreknee slightly yellowish; wing 
length 1.6-2. 3 mm, costa extending to vein M 1+2, 
last section of M 3+4 long, equal to or little 
shorter than penultimate; male genitalia with 
aedeagus as in figure 350. 
Host/Early Stages. Rosaceae, known from genera 
Potentilla , Rubus , and Sanguis orb a . Larva forming 
linear blotch mine (fig. 351, A), with frass in 2 
rows; puparium reddish brown, posterior spiracles 
each with 6 bulbs (fig. 352); larval mouth hooks 
as in figure 353. 
Distribution. California, Idaho, Washington; new 
records: Kansas, Louisiana, Texas. 
References. Frick, 1959: 357 (as A. rubi Brischke, 
1881); Spencer, 1969a: 58. 
- Mesonotum shining black A. varifrons Coquillett 
Synopsis. Frons reddish orange or yellow in front, 
darkened above; all antennal segments pale, orange 
or yellowish; mesonotum shining black; legs large- 
ly black but knees, tibiae, and tarsi paler; wing 
length about 2.3 mm, costa extending strongly to 
vein M 1+2; male genitalia with aedeagus as in 
figure 354; cercus (fig. 355) with distinctive 
arrangement of short, stout bristles on lower, 
inner corner (Florida). 
Host/Early Stages. Celtis laevigata . Larva forming 
irregular linear blotch mine (fig. 356) ex- 
ternally; posterior spiracles each with 3 bulbs; 
puparium orange. 
Distribution. District of Columbia, Florida, 
Illinois, Iowa, Pennsylvania; new records: 
Arkansas, Kansas, Mississippi, Texas. 
References. Frick, 1959: 358; Spencer and 
Stegmaier, 1973: 21; part 2, p. 269. 
5 (3). All body bristles yellow A. pallidiseta Malloch 
58 
