1882.1 OUi [Williston. 



Cheilosia nigripennis, sp. nov. 



^. — Deep black, ej^es bare. Frontal triangle and face shining black, 

 the former- fossulate, the latter very slightly excavated below tlie 'antennae. 

 Antennae small, basal joints black, third joint reddish-brown or brown, 

 rounded. Thorax black, nearly opaque, with short black pile above and 

 longer on the pleurae and scutellum, the latter shining. Abdomen short, 

 broadly oval, depressed, opaque black with a bluish cast, pile on the sides 

 of the anterior segments, reddish-yellow, anterior angles of third and 

 fourth segments, shining metallic. Tegulae with blackish" border, and a 

 fringe of black pile. Legs black. AVings blackish in front, clearer behind, 

 veins black. Long. corp. 7-8 mm. Three specimens from Mt. Hood, 

 Oregon. 



Cheilosia parva, sp. nov. 



9 — Shining greenish-black, with a brassy reflection. Eyes bare. Front 

 and face shining, the former with short, fuscous pile, the latter moderately 

 excavated below the antennae, tubercle broad, obtuse. Antennae black, 

 third joint oval, somewhat reddish below. Thorax and abdomen with 

 short, lutescent pile, sparse on the latter, which is elongate oval. Legs 

 luteous ; the anterior femora toward the base, rings of the tibiae, and ter- 

 minal joints of tarsi and the posterior legs except the ends of femora,, base 

 and tips of tibiae, brown or blackish. "Wings lutescent, veins black. Long. 

 Corp. 5-6 mm. Mt. Hood, Oregon. 



IV. 



J. — Small cross-vein before the middle of the discal cell. 

 2. — Antennae shorter than the liead. 

 aa. — Face tubercnlate or hyperstoma produced. 

 *.— Abdomen linear or oval, never club-shaped. 



ft — Black with luteous, reddish or yellow ; if uniformly black, 

 the liind femora tliickened. 



E. — Hyperstoma produced into a long, slender porrected snout ; femora 

 slender (the third longitudinal vein joins the costa beyond the tip). 



Rhingia. 



The single American species of this genus R. nasica Saj% is very common 

 in the Eastern States, but I have never seen a Rhingia from bej'ond 

 the Mississippi. 



EE. — Face not produced into a snout like hyperstoma, femora more or less 

 thickened. 

 F. — Face not produced, extending but little beyond the eyes, in rf' much 

 more tuberculate than in O ; hind femora usually with spines be- 

 low, abdomen oval. ]\Iostl}' black species or witli luteous mark- 

 ings at base of abdomen, scutellum, humeri, cheeks, etc 



Myiolepta. 



Four species have been described from Eastern North America, and the 

 genus js now recorded for the first time from the West. 



PROC. AMER. PHILOS. SOC. XX. 112. 2m. PRINTED AUGUST 3, 1882. 



