1895. PROCEEDINGS OF THE NATIONAL MUSEUM. 403 



ten inargiual bristles. Abdomen opaque, light gray pollinose, hind 

 margins of the fifth and sixth, and the following segments, wholly shin- 

 ing. Femora not thickened, the hind ones scarcely thicker than their 

 tibiiie; pile and bristles of femora minute. Wings hyaline, anterior 

 branch of third vein straight and nearly perpendicular. 



Tijpe.—^o. 3168, IJ.S.N.M.; female; length, 9 mm. 



Locality. — Xorthern California. 



EMPIS HUMILE, new species, 



Male. — Head black, gray pollinose except on oral margin; eyes sepa- 

 rated a less distance than width of the lowest ocellus, facets of a uni- 

 form size; antenmie having the two basal joints brownish yellow, the 

 third black, rather narrow, gradually tapering to the tip, style over 

 one-half as long as the third joint; proboscis from two to three times as 

 long as height of head, palpi light yellow. Thorax, pleura, and scutel- 

 lum black, opaque grayish pollinose, the rather long pile of thorax and 

 pleura black; thorax with two blackish vittsi?, scutellum bearing four 

 bristles. Abdomen black, shining, the pile rather long and abundant, 

 black; hypopygium large, lamelhe largely yellow, middle ones oblong^ 

 slightly tapering to the tip, not longer than the broad upx)er ones; fila- 

 ment slender, almost bristle-like, arcuate. Legs simple, rather robust; 

 coxaj black, femora brownish-yellow, lighter yellow at the base, tibire 

 and tarsi light yellow, tarsi brownish toward apex; middle and hind 

 legs x>rovided with rather long, stout, black bristles; front and hind 

 metatarsi subequal in size, the middle metatarsi considerably slen- 

 derer and only two-thirds as long as either of these. Knob of halteres 

 yellow. Wings brownish-gray, costal cell and border to some of the 

 veins yellowish ; stigma and veins dark brown. 



Female. — Same as the male, with these exceptions : Prothorax, the 

 lateral margins of the thorax, the scutellum, metanotum, pleura and 

 abdomen yellowish, a black spot above the middle and hind coxai, a 

 transverse one on lower part of the metanotum and sometimes a brown- 

 ish fascia near or on the hind margin of each abdominal segment except, 

 the first. Coxiie and legs yellow, hind metatarsi much thicker than 

 the front ones. 



Types.— :so>i. 31G9 and 3170, U.S.N.M.; length, 7 mm. Four males 

 and four females were collected by Mr. Charles Robertson, who writes 

 me that he has repeatedly taken these two forms together ''on the 

 same flowers," and believes that they are the opposite sexes of the 

 same species. 



Locality. — Illinois. 



EMPIS RAVIDA, new species. 



Male. — Black, the palpi and halteres yellow, the proboscis (except 

 the lower lip), hyi^opygium, coxa? (largely or wholly), femora, tibioe, 

 and tarsi, reddish yellow. Eyes contiguous, frontal triangle bare. 



