References. Spencer, 1969a: 88; Steyskal, 1972b: 1. 
Mesonotum black, abdomen greenish; frons not signi- 
ficantly projecting above eye; orbital setulae in 
2 rows, outer row reclinate M. panacis Steyskal 
Synopsis. Medium-sized species, wing length 2. 4-2. 8 
mm; male genitalia as in figures 35, 36. 
Host/Early Stages. Panax quinquefolius . Larva in- 
ternal stem borer. 
Distribution. Indiana, Ohio. 
Reference. Steyskal, 1981: 39. 
17 (15). Foretibial bristle strongly developed 
M. caerulea (Malloch) 
Synopsis. Large species, wing length 2. 6-3.4 mm; 
frons equal to width of eye, not projecting in 
profile; eye in male conspicuously pilose; meso- 
notum greenish blue, abdomen green; male genitalia 
with aedeagus as in figures 37, 38. 
Host/Early Stages. Ipomoea spp. (Convolvulaceae) . 
Larva feeding in seeds; posterior spiracular proc- 
esses widely separated, each with ellipse of 9 
bulbs, without central horn (fig. 39). 
Distribution. Florida, Texas; widespread in Carib- 
bean area, Costa Rica, Mexico, Venezuela. 
References. Malloch, 1913a: 322; Spencer and 
Stegmaier, 1973: 33; Spencer, 1973a: 104. 
— Foretibial bristle normally absent, at most weak 18 
18 (17). Large species, wing length 2.5-3.75 mm 19 
Smaller species, wing length 1.75-2.5 mm 29 
19 (18). Exceptionally large species, wing length in male 3 
mm, up to 3.75 mm in female 20 
— Smaller species, wing length from 2.5 mm in male to 
3.25 mm in female 21 
20 (19). Orbit and parafacial brilliantly shining 
M. miranda Spencer 
Synopsis. Large species, wing length 3-3.5 mm; 
frons broad, strongly projecting above eye (fig. 
40); 2 ors, 5 or 6 ori; gena deep, 0.33 height of 
eye; eye in male pilose; mesonotum blackish green, 
abdomen greenish or coppery; male genitalia with 
aedeagus as in figure 41. 
Host/Early Stages. Lithospermum arvense , also un- 
known species of Boraginaceae. Pupariura straw 
colored, posterior spiracles widely separated, 
each with ellipse of some 20 bulbs around short 
central horn. 
Distribution. Montana (new record) ; Canada. 
References. Spencer, 1969a: 72; part 2, p. 245. 
Orbit and parafacial not shining 
M. diantherae (Malloch) 
Synopsis. Exceptionally large species, wing length 
3-3.75 mm; frons broad; 2 ors, 3 ori; gena narrow, 
0.14 height of eye; mesonotum and Abdomen green- 
ish, only moderately shining; male genitalia with 
aedeagus as in figures 42, 43 (not previously 
illustrated). 
Host/Early Stages. Jus ticia ( =Dianthera ) ameri- 
22 
