TAXONOMY OF MUSCOIDEAN FLIES — TOWNSEND 89 



anteriorly to distinctly more than one-third head width at base of 

 antennae. No ocellar bristles, but some long fine hairs on and in 

 front of ocellar area. Frontal bristles in a single row on each side 

 close to frontalia, but widely divergent at an angle anteriorly, the 

 foremost two being out of line with main row and the only ones 

 inserted below first antennal joint. Vertical bristles consisting of a 

 moderately strong inner and a very weak outer one, the latter but 

 slightly longer than the row forming occipital fringe. Two strong, 

 lightly reclinate upper fronto-orbital bristles inserted close to fronta- 

 lia. in profile showing same strength and curvature as inner vertical, 

 all three being same distance apart in profile. Two strong middle 

 fronto-orbital bristles, strongly curved and proclinate, outside line 

 of preceding, the posterior one being inserted midway in profile be- 

 tween the two upper fronto-orbital bristles, the anterior one about 

 half way between foremost frontal bristle and vertex. Parafacials 

 wide, only gently narrowed below, fully two-thirds as wide on 

 lower portion as opposite base of antennae, bare. Width of cheeks 

 equal to about one-fourth eye height, cheek grooves well marked. 

 Lower margin of head arcuate, evenly bulged and rounded. Occi- 

 put considerably swollen below, behind eyes. 



Two sternopleural bristles, strong, formula 1:0: 1 ; hypopleural 

 bristles in a curved row, long but slender ; one moderately strong 

 pteropleural bristle with some fine hairs; three postsutural bristles, 

 supra-alar bristles stronger. Scutellar bristles in three strong mar- 

 ginal pairs and a weak apical decussate pair ; subapical pair longest, 

 reaching nearly to base of preanal segment ; a widely separated 

 discal pair about as strong as the apical. 



Wings decidedly longer than abdomen, rather broad, with very 

 small but distinct costal spine. No veins spined, except a few 

 bristles at base of third vein. Fourth vein bent roundly at an ob- 

 tuse angle, ultimate section slightly and evenly crooked, no wrinkle 

 or stump at bend. Hind crossvein bisinuate, slightly more than 

 one-half as far from bend as from small crossvein, which is on 

 middle of discal cell and about half way between ends of auxiliary 

 and first veins. Apical cell well open, ending on front border well 

 before wing-tip. Tegulae very large, antitegulae one-third as long. 



Abdomen broadly oval, rounded anally, only four segments vis- 

 ible from above, with almost equally short marginal and discal 

 macrochaetae. Ventral plates not visible. Anal segment with a ven- 

 tral median cleft, within which is the retracted ovipositor. 



Legs not elongate, normal, the hind tibiae quite thickly ciliate with 

 a slightly stronger bristle near middle. Claws and pulvilli (female) 

 short, not as long as last tarsal joint. Type, the following species: 



