44^ COQUILLETT 



Ccenosia albifrons (Zetterstedt). 



Aricia albifrons Zkt'VKKSTE.dt, Dipt. Scand.,viii, p. 3301, 1849, 



Muir Inlet, June 11 and 12; Popof Island, July 10; Saldovia, 

 Alaska, July 21 : Eight specimens. A European species, first re- 

 corded from this country about two years ago by Mr. P. Stein, of 

 Genthin, Germany, whose specimens were collected in Massachusetts. 



Homalomyia fla vivaria sp. no v. 



Male : Black, the halteres, except their bases, and a pair of large 

 spots on the second and third abdominal segments, light yellow, the 

 spots on the second segment subquadrate, those on the third subtrian- 

 gular, also usually a yellow spot at the anterior angles of the fourth 

 segment; frontal orbits whitish pruinose, in immature specimens con- 

 tiguous for a considerable distance on the median portion, but rather 

 widely separated in mature ones, antenna almost as long as the face, 

 the third joint one and one-half times as long as the second ; meso- 

 notum slightly polished, the sides and pleura light gray pruinose, 

 three pairs of postsutural dorsocentral bristles, sternopleurals i -f i ; 

 abdomen nearly linear but sometimes widening posteriorly, very thinly 

 gray pruinose ; coxae destitute of stout spines, front tibiae without 

 bristles except at apices, middle femora gradually thickening towafd 

 the middle, then slightly narrowing, with a small, rounded prominence 

 at two-thirds the length of the under side, which is densely covered 

 with short bristles, beyond this the femur is rather suddenly narrowed, 

 and continues so to the apex, the under-posterior side ciliate with 

 long bristles except on the apical fourth, on the anterior-under side 

 bearing two stout spines at one-fourth its length, beyond which it is 

 ciliate with rather long bristles to the prominence, the basal half of 

 the narrowed apical portion bare, the apical half ciliate with about 

 six very short bristles, middle tibiae each bearing a small, rounded 

 process at one-third of its inner side, the apical half considerably 

 thickened and with rather long pubescence on the inner side, bearing 

 a pair of bristles at three-fourths its length, one on the anterior and 

 the other on the posterior side ; hind femora sparsely ciliate with 

 rather short bristles on the basal two-thirds of the anterior-under side, 

 the posterior-under side bare; hind tibiae each bearing two bristles on 

 the penultimate fifth of the anterior-inner side, one below middle of 

 anterior side, and two on apical half of the anterior-outer side; wings 

 hyaline, fourth vein usually slightly curving toward the third at its 

 apex, calypteres yellowish, the upper projecting beyond the lower. 



Female: Abdomen yellow, hind margins of the first three segments 



