Key to Melanagromyza 
Species27 
1 . 
2 ( 1 ). 
3 ( 2 ). 
4 (3). 
5 (1). 
6 (5). 
7 ( 6 ). 
8 (7). 
Costa ending at or at least attenuated beyond vein 
R 4+5, not reaching M 1+2 2 
Costa extending strongly to vein M 1+2 5 
2+1 dc M . trispinosa Spencer 
Synopsis. Large species, wing length 2.5-2.75 mm; 
mesonotum greenish; squamal fringe white; male 
genitalia as in figures 8 , 9 . 
Host/Early Stages. Unknown. 
Distribution. California, widespread from Yolo Co. 
to Los Angeles Co. 
Reference. Spencer, 1981: 61. 
2 or 3 postsutural dc, no presutural 3 
Squamal fringe white 4 
Squamal fringe black Ophiomyia similata (Malloch) 
(Costa sometimes appearing to continue to vein 
M 1 + 2 , couplet 61) 
Mesonotum greenish M. tamia (Me lander) 
Synopsis. Large species, wing length 2.75 mm; 3 
postsutural dc; mesonotum greenish bluish; male 
genitalia as in figure 10 . 
Host/Early Stages. Unknown. 
Distribution. Washington. 
References. Melander, 1913: 258; Frick, 1959: 366. 
Mesonotum black; small species, wing length 2 mm 
Hexomyza winnemanae (Malloch) 
3 or 4 dc rmZIZZZr 5 
Only 2 dc 10 
Strong presutural dc present 7 
No presutural but up to 4 postsutural dc 8 
3 postsutural dc; antennae divided by facial keel; 
large species, wing length 3.5-4.25 mm 
" M. quadrisetosa Spencer 
Synopsis. Frons broad, twice width of eye, conspic- 
uously projecting above eye; mesonotum and abdomen 
greenish; squama and fringe white; male genitalia 
as in figures 11 , 12 . 
Host /Early Stages. Unknown. 
Distribution. California. 
Reference. Spencer, 1981: 54. 
2 postsutural dc; no facial keel; smaller species, 
wing length 2.5-2.75 mm M. trispinella Spencer 
Synopsis. Frons broad, twice width of eye, pro- 
jecting above eye; mesonotum and abdomen greenish; 
squama and fringe whitish; male genitalia as in 
figures 13, 14. 
Host/Early Stages. Unknown. 
Distribution. California. 
Reference. Spencer, 1981: 59. 
Distinct, raised keel dividing base of antennae 9 
Antennae not divided by raised keel 
~ M. setifrons (Melander) 
Synopsis. Stout; orbit distinctly projecting above 
- Includes certain Hexomyza and Ophiomyia species; see also Melanaeromvza so. 
(p. 249). Z 
19 
