KEY TO AGROMYZIDAE 1. Subcosta developed throughout its length (fig. 4), 
SUBFAMILIES AND coalescing with R 1 before reaching costa (sub- 
GENERA family Agromyzinae) 2 
Subcosta becoming a fold distally (fig. 5), ending 
ing in costa separately, and based on R 1 (sub- 
family Phytomyzinae) 6 
2. Scutel lars (prsc) lacking 3 
Prsc present 5 
3. Mesonotum or abdomen frequently with some metallic 
coloration, greenish, bluish, or coppery; costa 
extending strongly to vein M 1+2 (except in M. 
tamia and M. trispinosa ) ; antennae not normally 
separated by raised keel, male never with vibris- 
sal fasciculus; aedeagus symmetrical, with basal 
sclerites U-shaped (fig. 23); larval posterior 
spiracles on flat plate, with numerous bulbs, 
from 6 to 20, normally surrounding a strong black 
horn, the latter rarely atrophied to a mere scar 
(fig. 32) Melanagromyza Hendel (p. 19) 
— Uniformly black species (mesonotum and abdomen 
faintly greenish only in 0. jacintensis group) ; 
costa ending at R 4+5 or continuing to M 1+2; 
aedeagus frequently asymmetrical, with basal 
sclerites frequently diverging (fig. 226); poste- 
rior spiracles of larva normally on distinct 
stalks, each process with either 3 or more (nor- 
mally with numerous) bulbs, never with central 
horn (fig. 199) 4 
4 (3). Antennae normally separated by conspicuous facial 
keel; male frequently with distinct vibrissal 
fasciculus (fig. 221); larval posterior spira- 
cular process normally with between 6 and 12 
bulbs Ophiomyia Braschnikov (p. 37) 
— Antennae adjoining; vibrissal fasciculus never 
present; larval posterior spiracles always with 3 
bulbs on each process (fig. 158) 
Hexomyza Enderlein (p. 35) 
5 (2). At least 3 pairs of dorsocentrals (dc); prsc al- 
ways present; presutural dc frequently present; 
stridulating mechanism present in both sexes 
(figs. 346-348) Agromyza Fallen (p. 57) 
— Normally 2 pairs of dc; if 3+1 dc , frons reddish 
(J. rutiliceps ) ; prsc present or lacking; stri- 
dulating mechanism lacking 
Japanagromyza Sasakawa (p. 53) 
6 (1). Orbital setulae erect, reclinate, or absent (fig. 
394) 7 
Orbital setulae distinctly proclinate (fig. 1163)- 18 
7 (6). Vein R 4+5 ending nearest wing tip 
Phytobia Lioy (p. 71) 
Vein M 1+2 ending nearest wing tip 8 
8 (7). Wing with costa extending to apex of vein M.l+2; 
if only to R 4+5, then lunule substantially 
higher than semicircle ( Cerodontha frankensis ) 9 
Costa extending only to R 4+5 17 
15 
