arista M. f loridensis Spencer 
Synopsis. Small, shining, greenish species, wing 
length 2.2 mm; frons little wider than eye; 2 ors, 
2 ori, orbital setulae reclinate; gena narrow, 
0.10 height of eye; male genitalia as in figures 
96, 97. 
Host/Early Stages. Desmodium tortuosum . Larva 
feeding and pupating in single seed within pod; 
puparium pale orange, posterior spiracles sepa- 
rated by slightly more than own diameter, each 
with 10-12 irregular bulbs around small central 
scar (fig. 98). 
Distribution. Florida; Caribbean islands, Guyana, 
Venezuela. 
References. Spencer, 1963a: 312; Spencer and 
Stegmaier, 1973: 37. 
— Orbital setulae long, substantially longer than pu- 
bescence of arista M. miamensis Spencer 
Synopsis. Closely resembling M. f loridensis but 
male genitalia distinctive as in figures 99, 100; 
conspicuous row of spines along inner margin of 
epandrium (fig. 101). 
Host/Early Stages. Species of orchid. Holotype 
labeled "orchid-larva destroys bloom"; larva not 
known . 
Distribution. Florida. 
Reference. Spencer and Stegmaier, 1973: 43. 
45 (43). Gena narrow, 0.10 height of eye; mesonotum shining 
green M. vectabilis Spencer 
Synopsis. Small green species, wing length 2.3 mm; 
frons only slightly wider than eye, this conspicu- 
ously pilose in male; gena narrow, 0.10 height of 
eye; male genitalia as in figures 102, 103. 
Host/Early Stages. Unknown. 
Distribution. Florida; Bahamas. 
Reference. Spencer and Stegmaier, 1973: 50. 
Gena broader, 0.25 height of eye; mesonotum with 
only faint greenish reflections, largely matt 
blackish M. verbesinae Spencer, n. sp. 
Synopsis. Closely resembling M. vectabilis but 
frons wider, 1.5 times width of eye, and gena 
broader; male genitalia with aedeagus as in 
figures 104, 105. 
Host/Early Stages. Verbesina alternifolia . Larva 
internal stem borer; puparium straw colored, pos- 
terior spiracular plates closely adjoining, each 
with ellipse of 12 bulbs. 
Distribution. Ohio. 
Reference. Part 2, p. 248. 
46 (10). Gena with conspicuous fringe of peristomal hairs 
(fig. 181) Ophiomyia lauta (Spencer) 
Peristomal hairs normal 47 
47 (46). Exceptionally large species, wing length 3.6-4.25 
mm M. marinensis Spencer 
Synopsis. Frons broad, 2.5 times width of eye, 
conspicuously projecting above eye; 2 ors, up to 6 
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