102 PROCEEDINGS OF THE NATIONAL MUSEUM. .-oi. xxv. 



Family SCENOPINID.E. 



PSEUDATRICHIA FLAVICEPS, new species. 



Head dark 3"ellow, the occiput except the sides and an emariiination 

 behind the ocelli, an ocellar spot, and spot in middle of lower hall' of 

 front, black; antennae and month parts black; thorax and sciitellum 

 polished, black, a large yellow spot at inner side of each humerus, an 

 interrupted white line below each wing, hairs of mesonotum short, 

 depressed, brassy yellow, arranged in stripes, those of pleura white; 

 abdomen polished, bronze black, hind margins of segments two to six, 

 white; legs black, the knees yellow, this color most extended on the 

 front pair; wings hyaline, veins brown, apex of second vein close to 

 tip of hrst, halteres pale brown, marked with a few white streaks and 

 dots; length, mm. Two females collected July 15 by Mr. H. S. 

 Barber. 



Habitat . — Williams, Arizona. 



Type.—OAi. No. <)193, U.S.N.M. 



PSEUDATRICHIA PILOSA, new species. 



Black, polished, dorsum of al)domen bronze color, hind margins of 

 segments two to five white, halteres white, a l)lackish spot on upper 

 side of each knob; thorax and femora covered with rather long nearly 

 erect white hairs mixed with many black ones on the mesonotum; 

 wings hyaline, veins brown, second vein ending close to apex of the 

 first; length, 1 mm.- Two males collected by Mr. H. S. Barber. 



Ilahitat. — Williams (July T) and Hot Springs (June 28), Arizona. 



Type.— Cat. No. 6191, U.S.N.M. 



Family EMPID.F. 



MYTHICOMYIA SCUTELLATA, new species. 



Black, a spot above antenna^ the oral margin, corners of thorax and 

 a vitta connecting the two on each side, a vitta on lower part of pleura, 

 greater part of scutellum, venter, sides and hind margins of abdominal 

 segments, halteres and knees light yellow, tarsi and apical portion of 

 tibiffi brown; face opaque, gray pruinose, front, mesonotum and abdo- 

 men polished; wings hyaline, the veins brown; third joint of antenni« 

 oval, less than twice as long as broad, slightly over twice as long as 

 the style; hairs of body very short and sparse; length, 1.5 mm. 

 Seven females colle(;ted June by Mr. H. S. Barber. 



Ilahitat. — Williams, Arizona. 



Ti/jx^-Cat. No. 6195, U.S.N.M. 



MYTHICOMYIA PICTIPES, new species. 



Differs from sciitcUdta as follows: Femora and tibiic yellow, the 

 former with a black vitta on upper side, the latter with a brown vitta 



