upper half of frons bearing three 
ocelli above and with apex sometimes 
greatly extended toward margin of 
lunule . 
Orbit (s) — Narrow plates between eye 
margin and frons bearing orbital 
bristles and setulae, varying in 
width and sometimes raised or 
broadened . 
Orbital bristles — (See lower and upper 
orbital bristles.) 
Orbital setulae — Rows of minute hairs 
on orbits normally between eye 
margin and orbital bristles (direc- 
tion of inclination of these setulae 
can be of generic significance). 
Ovipositor sheath — Cylindrical 
structure into which ovipositor is 
withdrawn. 
Palpus — Paired processes adjoining 
mouthparts. 
Parafacial (cheek) — Membranous area 
immediately below eye, not always 
clearly separable from gena, which 
extends below to margin of head. 
Prescutellar bristles (prsc) — Pair of 
bristles lying at center rear of 
mesonotum. 
Proboscis — Feeding organ, greatly 
elongated in some species. 
Scutellar bristles — Normally two pairs 
of strong bristles on scutellum. 
Scutellum — Rear, dorsal section of 
thorax. 
Squamae — Two lobes of wing membrane 
behind wing base, usually folded to 
lie one above the other (color is 
frequently significant). 
Squama 1 fringe — Fringe of hairs on 
squamae (color is important specific 
character) . 
Tarsus — Fifth section of leg (itself 
divided into five sections). 
Tergite(s) — Dorsal sclerites of abdo- 
men. 
Tibia — Fourth section of leg. 
Trochanter — Second section of leg, 
between coxa and femur. 
Upper orbital bristles (ors) — One to 
three strong, normally reclinate 
bristles on upper half of orbits. 
Vibrissa — Usually strong bristle at 
lower, inner corner of gena. 
Vibrissal fasciculus — Fused group of 
vibrissal bristles found in males of 
most Ophiomyia species. 
Wing (fig. 1) — Traditional taxo- 
nomic terminology is maintained. 
Costa (C): First longitudinal vein 
forming upper margin of wing and 
normally conspicuously thickened, 
either to termination of vein R 4+5 
or to M 1+2; second costal section 
lying between apex of veins R 1 and 
R 2+3; and fourth costal section 
lying between apex of veins R 4+5 
and M 1+2. 
Male Terminal ia 
No uniform terminology has been 
current for discussing male geni- 
talia. The terms used here are mostly 
those proposed by Nowakowski 
(1962) or Griffiths (1972b). De- 
tailed descriptions have not been 
included except for a few critical 
species. However, the aedeagus in the 
Agromyzidae is in most species so 
highly evolved and characteristic that 
illustrations in side, ventral, or 
both views suffice to permit immediate 
identification. The general arrange- 
ment of the male genitalia is shown in 
figure 3, and the terms are briefly 
defined here. 
Aedeagus — Actual intromittent organ, 
consisting basically of four 
sections — basiphallus, meso- 
phallus, hypophallus , and distiphal- 
lus; aedeagal apodeme is long. 
5 
