226 Journal New York Entomological Society. tVoi. xxiii, 



Phantasiomyia gracilis new species. 



Length of body, 6 to 6.5 mm. ; of wing, 5 mm. Three males, Beulah, New 

 Mexico, one July , 1902, the others July 15 (Cockerell). 



Antennae, frontalia and palpi rufoflavous, the third antennal joint tinged 

 with fuscous on apical portion and upper edge ; arista blackish. Head silvery ; 

 parafrontals, mesoscutum and scutellum cinereous ; pleurae silvery ; abdomen 

 silvery on narrow bases of segments, rest thickly pollinose with rather more 

 of a brassy tinge than mesoscutum. Femora brown, tibiae testaceous, tarsi 

 black. Wings clear, tegulae white. 



Holotype, No. 19620 U. S. N. M. 



Family MINTHOID.^. 



POLIDEOSOMA new genus. 



Genotype, Polideosoma rohzvcri Townsend new species. 



Male. Form narrowed. Frontal one and one half times lower 

 profile of head. Facial profile well receding. Antennal one and one 

 half times vibrissal axis. Clypeus rather broad, slightly wider below 

 than above ; carina very faint. Epistoma rather cut off, the edge 

 faintly prominent. Facialia wholly bare, sharp. Vibrissae exactly 

 on oral margin. Peristomalia short, widely separated, with bristles 

 much weaker than vibrissae. Proboscis very short and fleshy, part 

 below geniculation about one half length of third antennal joint. 

 Palpi small, a little thickened at tip. Antennse inserted far above 

 eye-middle, near upper eye-limits; second joint very short; third 

 joint about six times as long as second, rather heavy, dilated and sub- 

 truncate apically, the front apical corner produced, the front edge 

 thus concave in profile. Arista about as long as third antennal joint, 

 enlarged on basal half, thence tapering evenly to tip; the basal joints 

 short but both distinct, each as long as broad. Eyes practically bare, 

 rounded, almost as broad as high. Front equilateral, slightly wider 

 than one eye. Parafrontalia with fine short bristly hairs on orbital 

 edges. Three frontals on each side, descending about to end of second 

 antennal joint. Inner verticals long, straight, reclinate, not decussate; 

 outer ones one half as long, divaricate. Four proclinate fronto- 

 orbitals on each side, the front and hind ones weak; two reclinate on 

 each side, hind ones divaricate. Frontalia in front about three fifths 

 as wide as parafrontalia, widening rapidly behind to nearly fill front 

 where the arms enclose ocellar area. Ocellars present, proclinate- 

 divaricate. Parafacialia rather narrow, elongate, with some faint 



