hindcorner of epandrium with 2 short teeth; sur- 
stylus with single stout spine. 
Host/Early Stages. Commelina elegans (almost 
certainly other Commelina species), Tradescantia 
f luminens is . Larva forming long, narrow, whitish 
mine, with frass in conspicuous black lumps; pu- 
parium black, remaining in mine, posterior spira- 
cles arising from stout protuberance, each with 3 
bulbs, 1 hooklike, smaller 2 reduced to minute 
pores near midpoint (fig. 662). 
Distribution. Florida; Argentina, Brazil, Cuba, 
Jamaica, St. Vincent, Venezuela. 
References. Frost, 1931: 72; Frick, 1959: 403; 
Spencer and Stegmaier, 1973: 101; part 2, p. 286. 
Mesonotum centrally broadly yellow adjoining 
scutellum (fig. 673) 15 
15 (14). Epandrium in male with sclerotized bar at hind- 
corner (fig. 676) 16 
Epandrium in male with short, stout bristle at 
hindcorner (as normal in genus) 
L. philadelphivora Spencer 
Synopsis. Frons not projecting above eye, bright 
yellow, as also entire hindmargin of eye, all 
antennal segments, and palpus; mesonotum shining 
black, divided into bands, broadly yellow adjoin- 
ing scutellum (see fig. 653), either 2+1 dc or 
less frequently 3+1; legs entirely yellow, femora 
without lateral bristles; wing length 1.9-2. 2 mm, 
last section of M 3+4 1.5-2 times length of 
penultimate; male genitalia with aedeagus as in 
figures 663, 664; surstylus with long curving 
spine (fig. 665); sperm in figures 663, 664; 
surstylus with long curving spine (fig. 665); 
sperm pump with narrow stalk and moderately widen- 
ing blade. 
Host/Early Stages. Philadelphus grandiflorus and 
other P. species. Larva forming large white 
blotch (fig. 666) with irregularly scattered black 
frass; puparium orange, posterior spiracles each 
with irregular ellipse of about 10 bulbs, 1 ex- 
tended; cephalopharyngeal skeleton as in figure 
667. 
Distribution. New records: District of Columbia, 
New York; Canada. 
References. Frost, 1924: 47 (as Agromyza 
melampyga ) ; Spencer, 1969a: 182; part 2, p. 291. 
16 (15). Cercus in male with long hair at end (fig. 668) 
L. blechi Spencer 
Synopsis. Essentially as in ]?. philadelphivora ; 
male genitalia with aedeagus as in figures 669, 
670, distiphallus somewhat elongate; epandrium and 
surstylus as in L. marginalis (fig. 676); sperm 
pump with narrow blade and broad base. 
Host/Early Stages. Blechum brownei , B. pyr ami - 
datum ; other possible hosts are Heliotropium 
(Boraginaceae) , Lippia (Verbenaceae) , Plantago 
113 
