times width of eye; orbital bristles 
strong, 2 ors, 2 ori, orbital setulae 
sparse, reclinate; ocellar triangle 
slightly extended beyond foremost 
ocellus; gena narrow, only slightly 
extended at rear, 0.17 height of eye; 
3d antennal segment small, round, 
arista distinctly pubescent. 
Mesonotum. 3 dc , small, close to 
suture, prsc strong, equal to 2d dc, 
acr in 8-10 rows. 
Wing. Length 2.5 mm, C extending 
strongly to M 1+2, last section of 
M 3+4 about 0.67 penultimate, inner 
crossvein slightly before or at 
midpoint of discal cell. 
Color. Frons deep black, antenna 
black; mesonotum and abdomen shining 
black; legs largely black, tarsi at 
most slightly paler; squama pale gray, 
margin brown, fringe blackish; veins 
dark. 
Male genitalia. Aedeagus as in 
figures 424, 425; surstylus with row 
of short spines continuing to lower 
corner. 
Host/early stages. Unconfirmed but 
certainly Poaceae. 
Holotype m. , North Carolina, Mitchell 
Co., Roan Mountain, 6,200 ft, 
13. VIII. 57; 1 f., same data; (both J. 
G. Chillcott); Tennessee, Sevier Co., 
Great Smoky Mountains National Park, 
5,200 ft, 1 m., 3. VII. 57 (C. D. 
Hines). Holotype and paratypes in CNC. 
Remarks. Distinctive characters of 
this species are the dark squamal 
fringe, narrow gena, and pubescent 
arista. It somewhat resembles A. 
parilis , but the male genitalia of the 
two are entirely distinct. 
Agromyza parilis Spencer, new species 
(Figs. 426, 427) 
Head. Frons narrowly projecting above 
eye, 1.5 times width of eye; orbital 
bristles slender, 2 ors, 2 ori, orbital 
setulae sparse, reclinate; ocellar tri- 
angle not differentiated beyond fore- 
most ocellus; gena extended at rear, 
0.25 height of eye; 3d antennal 
segment rounded, slightly longer than 
broad, arista appearing bare. 
Mesonotum. Only 2 strong differenti- 
ated dc, prsc slightly weaker than 2d 
dc, acr in 8 rows. 
Wing. Length in male 2.4 mm, C 
extending strongly to M 1+2, last 
section of R 3+4 0.67 penultimate, 
inner crossvein at center of discal 
cell . 
Color. Frons sooty black; 3d antennal 
segment predominantly black but 
slightly paler, yellowish brown on 
lower half both on inside and outside, 
2d segment similarly pale, 1st black; 
mesonotum and abdomen shining black; 
legs with femora black, tibiae and 
tarsi only slightly paler, brownish 
black; squama pale gray, margin and 
fringe brownish black; wing veins dark. 
Male genitalia. Aedeagus (figs. 426, 
427) with distal tubules broad, heavily 
pigmented; sternite IX with narrow 
sidearms, broadly fused at apex; 
surstylus with group of short stout 
bristles but bare at lower corner; 
sperm pump with small, circular blade 
and unusually long stalk, base only 
slightly extended on one side. 
Host/early stages. Unconfirmed but 
certainly Poaceae. 
Holotype m. , Tennessee, Hamilton Co., 
East Ridge, 9.V.52 (G. S. Walley), in 
CNC. 
Remarks. Distinctive characters of 
this species are dark squamal fringe, 
broad gena, and bare arista. It 
somewhat resembles A. parca , but the 
male genitalia of the two are entirely 
distinct . 
Agromyza potentillae (Kaltenbach) 
(Figs. 444-448) 
Phytomyza potentillae Kaltenbach, 
1864: 351. Types from Germany lost. 
266 
