No. 2301. NEW SPECIES OF MU8C0ID FLIES— TOWNSEND. 543 



Proboscis short, palpi club-shaped, sub compressed. Third antennal 

 joint about three and one-half times second. Arista thinly long- 

 plumose about two-thirds way. Frontals diverging one below base 

 of antennae. Two procHnate fronto-orbitals in female. Ocellars 

 present. Parafacialia irregularly set with several faint hairs down 

 middle. Cheeks over one-fifth eye length. Three sternopleurals 

 and postsuturals ; two postintraalars ; one preacrostichal and post- 

 acrostichal; three lateral scutellars, but no apical. Third vein 

 bristled halfway to small crossvein ; others bare. Apical cell widely 

 open some distance before tip. Hind crossvein nearer to cubitus, 

 which bears a wrinkle. No median marginals on first two segments; 

 marginal row on third and anal segments. First hypopygial tergite 

 of female entire. 



CHLOROSARCOPHAGA CX)CHLIOMYU, new species. 



Length, 6.5 mm. One female. Upper Chagres River, Canal Zone, 

 Panama, October 9, 1917, 548 (Harold Morrison). 



Dull metallic green, thinly poUinose. Face, front and occipital 

 orbits golden; frontalia, antennae and palpi black. Mesoscutmn 

 brassy-silvery poUinose, leaving three broad dark vittae like those 

 of OocMiomyia. Scutellum and abdomen thinly marmorate with 

 silvery. Hypopygium rufous. Legs black, femora greenish. Wings 

 faintly smoky-yellowish. Tegulae glassy-whitish. 



Type.—C^i. No. 22086, U.S.N.M. 



PETROSARCOPHAGA, new genus. 



Genotype. — PetrosarcopJiaga anzonica, new species. 



Clypeus rather elongate, about twice as long as wide. Epistoma 

 elongate, narrow, somewhat warped. Facialia bristled halfway. 

 Proboscis short, palpi club-shaped and bowed. Third antennal joint 

 about three and one-half times second. Arista long-plumose about 

 two-thirds way. Eyes bare. Frontals diverging one or two below 

 base of antennae. No proclinate fronto-orbitals in male. Ocellars- 

 present. Parafacialia about as wide as clypeus, set with a few sea t 

 tered setae ; a row of bristly hairs next eye. Cheeks three-fifths eye 

 length. No preacrostichals ; one postacrostichal ; two postintraalars 

 and lateral scutellars; three sternopleurals; four postsuturals, the 

 two anterior ones short. A moderately short erect decussate apical 

 pair of scutellars in male, none in female. Third vein bristled over 

 halfway to small crossvein, others bare. Apical cell open well before 

 tip. Cubitus two-fifths the wing breadth from hind margin. Pos- 

 terior crossvein nearer to cubitus. Male tibiae all lacking long hair. 

 No median marginals on first two segments, median marginal pair on 

 third, marginal row on anal segment. First hypopygial tergite of 

 female showing a carinate seam or fold on median line, and excised 

 in a vertical slit set with bristles. 



