pump with narrow blade, similar in 
length to aedeagus. 
Host/early stages. Abutilon 
theophrasti and probably other genera 
of Malvaceae. Larva forming character- 
istic raised mine or "welt" in stem, 
feeding both upward and downward, 
pupating with anterior spiracles 
projecting through epidermis, length 
of visible welt varies from 2.5 to 8 
cm; puparium yellowish, posterior 
spiracles on 2 short stalks, each with 
row of 4-6 bulbs (fig. 199). 
Holotype m. , Minnesota, Dakota Co., 
Rosemount, Agricultural Research 
Station, 13. IX. 78; paratypes 1 m. , 3 
f . , same data; 4m., 2 f., same 
locality, Aug. 79; (all R. N. Andersen 
and R. Ralston); Mississippi, 
Washington Co., Stoneville and 
Merigold, 8m., 2 f . , ex "stem galls" 
on Abutilon theophrasti , 22.X.79 (K. 
E. Frick); Florida, Broward Co., Fort 
Lauderdale, 2m., 2 f., on flowers of 
Sida cordifolia , 16. III. 80 (H. E. 
Walker). Holotype and paratypes in 
USNM; other paratypes in Department of 
Entomology, University of Minnesota, 
St. Paul; Southern Weed Science 
Laboratory, Stoneville, Miss.; and KAS. 
Mines on Abutilon theophrasti have 
also been found in Minnesota, Goodhue 
Co., Red Wing, and Wisconsin, Crawford 
Co., Barnum (R. N. Andersen and R. 
Ralston); also in central Illinois (R. 
M. Wax). 
Remarks. This is the first species of 
which the host and biology are known 
in the complex group comprising 0. 
similata (p. 258), £. lauta (p. 255), 
and the £. jacintensis group in 
California. The latter were assigned 
to Ophiomyia rather than Me 1 ana gr omy z a 
on the basis of their male genitalia, 
and confirmation of the correct 
generic position of the group has been 
obtained from the discovery of the 
host and feeding habit of 0. 
abutilivora . 
Although native species of Abutilon 
occur in California, it seems certain 
that (). abutilivora feeds on other 
genera of Malvaceae, from which it has 
transferred to the introduced A. 
theophrasti . 
It has also been discovered that 0. 
tiliae , a gall causer on twigs of Tilia 
americana that was previously placed 
in the genus Hexomyza , has very 
similar genitalia to those of (). 
abutilivora and clearly belongs to the 
same group. 
Ophiomyia arizonensis Spencer, new 
species 
(Figs. 316-318) 
Head (fig. 316). Frons about 1.5 times 
width of eye, not projecting above eye 
in profile; 2 ors, 2 ori, orbital 
setulae sparse, reclinate; gena nar- 
row, 0.17 height of eye, forming angle 
of approx. 70°; vibrissal fasciculus 
in male short, slender; facial keel 
narrow, distinctly raised, without 
furrow but flattened above base of 
antennae . 
Mesonotum. 2 dc (acr missing). 
Wing. Length in male 1.9 mm, C ex- 
tending to M 1+2 (relative lengths of 
M 3+4 and position of inner crossvein 
not detectable, as one wing missing 
and the other damaged). 
Color. Black, ocellar triangle and 
orbits moderately shining; mesonotum 
and abdomen more strongly so; squama 
gray, margin and fringe black. 
Male genitalia. Aedeagus as in 
figures 317, 318. 
Host/early stages. Unknown. 
Holotype m. , Arizona, Yuma Co., 
Wellton, 5-6. V. 18 (J. C. Bradley), in 
CUI. 
Remarks. There are minor external 
differences between this species and 0. 
levata , but the male genitalia of the 
two are entirely distinct. 
251 
