to brownish; wing length 1 . 9 - 2. 2 mm (fig. 431) 
with last section of M 3+4 equal to or slightly 
longer than penultimate; male genitalia with ae- 
deagus as in figures 432, 433. 
Host/Early Stages. Medicago spp., particularly M. 
sativa , less frequently Meli lotus and TrifoliumT 
Larva forms characteristic linear blotch mine 
(fig. 434), cephalo pharyngeal skeleton (fig. 435) 
with mouth hooks having 2 strong teeth and rudi- 
mentary 3d one below; puparium reddish brown, 
posterior spiracles each with 3 bulbs (fig. 436). 
Distribution. Massachusetts, New Jersey, New York; 
widespread in Europe. 
References. Steyskal, 1972a; Spencer, 1973a: 85; 
Guppy, 1981: 593. 
Costa extending to vein M 1+2 34 
34 (33). 3d antennal segment yellow A. aristata Malloch 
(Arrangement of dorsocentral bristles normally 
3+2, see couplet 6 .) 
3d antennal segment black or dark brown 35 
35 (34). Squama 1 fringe pale, whitish 36 
Squama 1 fringe dark, brown or black 39 
36 (35). Frons dark, brownish black A. isolata Malloch 
Synopsis. Frons dark, brownish black; gena narrow, 
at rear 0.125 height of eye; 3d antennal segment 
small, round, black, 1 st and 2 d paler, more brown- 
ish; mesonotum blackish gray, presutural dc only 
slightly weaker than 3d; legs with femora largely 
black, tibiae and tarsi paler yellowish; squama 
and fringe yellowish; wing length 2 . 4 - 3. 1 mm; male 
genitalia with aedeagus as in figures 437 , 438. 
Host/Early Stages. Populus spp., Salix spp. Larva 
forming large, irregular blackish blotch, pupat- 
ing externally; puparium reddish brown, posterior 
spiracles each with 3 bulbs. 
Distribution. California, Pennsylvania (as A. 
albitarsus , Frick, 1959: 353); new records: 
Colorado, Clear Creek Co., Mt . Evans, Doolittle 
Ranch, 9,800 ft, 1 m., 1 f . , 3. VIII. 61 (J. G. 
Chillcott and C. H. Mann, CNC) ; Minnesota, Henne- 
pin Co., Minneapolis, Minnehaha Creek, empty leaf 
mines on Populus deltoides , 10. IX. 78 (KAS); 
Washington; Canada. 
References. Spencer, 1969a: 52 (as A. populoides); 
1981: 121 (as A. populoides ) ; part 2, p. 264. 
Frons reddish 37 
37 (36). Mesonotum shining black 
Japanagromyza rutiliceps (Melander) 
Mesonotum matt gray 33 
38 (37). Small species, wing length about 2.3 mm in female-- 
” A. sp. (Wyoming) 
Synopsis. Frons reddish, orbit black; 2 ors, 2 
ori; 3d antennal segment dark, small, round; 
mesonotum gray, 3+1 strong dc ; legs black, only 
foreknee narrowly paler; squama and fringe white; 
69 
