Key to Amauromyza 1. Halter entirely black 2 
Subgenera Species — Halter at least partially pale, white or yellow 3 
2 (1). Frons strongly projecting above eye in profile 
A. ( Cephalomyza ) abnormal is (Mai loch) 
Synopsis. Frons and orbit strongly projecting 
above eye, matt black; 2 ors, 3 ori; gena angular, 
deeply extended at rear, up to 0.5 height of eye; 
mesonotum dull black with only faint subshine, 3+1 
dc, acr irregularly in 4 rows; pleura entirely 
black, moderately shining; legs black; squama 
gray, margin and fringe black; halter black; wing 
length from 2.2 mm in male to 3.2 mm in female, 
costa extending strongly to vein M 1+2, last sec- 
tion of M 3+4 twice penultimate; male genitalia 
with aedeagus having paired distal sclerites 
enlarged, enclosed in strongly spiculate membrane 
(fig. 489, California; fig. 490, Quebec). 
Host/Early Stages. Amaranthus . Larva feeding in 
stem and "roots." 
Distribution. California, District of Columbia, 
Iowa, Kansas; Canada. 
References. Malloch, 1913a: 320 (fig. of wing); 
Spencer, 1969a: 158; 1981: 148; part 2, p. 273. 
Frons only narrowly projecting toward base of 
antennae A. ( Cephalomyza ) insularis Spencer 
Synopsis. Frons dark brown, orbit more black; 5 
orbital bristles on one side, 7 on other; gena 
extended at rear, almost 0.33 height of eye; 
mesonotum with 3+2 dc, black, weakly shining; legs 
and halter black; squama gray, margin and fringe 
black; wing length in male 2 mm, last section of 
M 3+4 just over 1.5 times penultimate; male gen- 
italia with aedeagus as in figures 491, 492. 
Host /Early Stages. Unknown. 
Distribution. California. 
Reference. Spencer, 1981: 154. 
3 (1). Knob of halter partially dark 4 
Knob of halter entirely white or yellow 7 
4 (3). Knob of halter darkened on lower half 5 
Knob of halter white with black spot above 
A. ( Annimyzella ) maculosa (Malloch) 
Synopsis. Head entirely black, frons narrow, 
little more than width of eye; orbital bristles 
strong, 2 ors, 2 or 3 ori; mesonotum shining 
black, with 3+1 strong dc, acr irregularly in 4 
rows, prsc weak; legs black; wing length from 2.1 
mm in male to 2.5 mm in female; squama and fringe 
silvery white, halter white, with conspicuous oval 
black spot above; male genitalia with aedeagus 
(figs. 493, 494) having diverging paired tubules; 
sperm pump with reduced base (fig. 495). 
Host/Early Stages. Asteraceae, recorded from 
following genera: Aster , Baccharis, Bidens , 
Chrysanthemum , Conyza , Emilia , Erechtites , 
Erigeron , Eupatorium , Gaillardia , Gnaphalium , 
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