121 



Third vein bearing" only two bristles at the base, front of the male 

 one and one-half times as wide as either eye; yellow, the third 

 anteunal joint, i^roboscis, center of dorsum of thorax, three 

 spots on the pleura, and a dorsal spot on the third and fourth 

 segments of the abdomen black; frontal bristles descending 

 almost to apex of second antennal joint, third antennal joint 

 twice as long as the second, arista thickened on the basal third, 

 cheeks nearly one-half as wide as the eye height, proboscis slen- 

 der, rigid, labella very small ; second and third segments of abdo- 

 men bearing marginal macrochoetiTe, the fourth covered except 

 on the basal third; wings hyaline, calypteres white; front pul- 

 villi slightly shorter than the last tarsal joint; length, 11 mm. 

 Denver, Colo. A single male specimen. Type in U. S. National 



Museum / .^ r-r .■>.a'~~'. lyalWdns u. sp. 



3. Scutelluin yellow, four postsutural and four steruopleural macro- 

 chaetfe; black, the first two joints of the antenna?, the palpi, 

 seutellum, and sides of the last three abdominal segments, also 

 the apex of the fourth, yellow; front in female slightly wider 

 than either eye, frontal bristles descending almost to tip of 

 second antennal joint, antenuic yearly three-fourths as long as 

 the face, the third joint one and one fourth times as long as the 

 second, arista thickened on the basal three-fifths, the penulti- 

 mate joint one and one half times as long as wide; head at base 

 of antennie slightly shorter than on its lower edge, vibrissfe 

 inserted about half the length of the second antennal joint 

 above the oral margin, three or four bristles above each; thorax 

 gray pollinose, marked with four black vittte ; seutellum bearing- 

 four pairs of rather long marginal macrocha'ta» ; abdomen thinly 

 gray pollinose, second segment bearing a x)air of marginal ma- 

 crochsettT, the third bearing a marginal row, the fourth covered 

 except on the basal fifth; middle tibite each bearing two long 

 macrochictie on the front side near the middle, the hind tibiiie 

 outwardly subciliate; wings hyaline, third vein bearing about 

 four bristles near its base, the others bare, apex of third vein mid- 

 way between tip of second and the extreme wing tip, hind cross- 

 vein at last third of distance from the small to the bend, the 

 latter not appendiculate ; calypteres white ; length, 8 mm. Siski- 

 you Co., Cal. A female specimen bred from Melitcm palla by 

 A. Koebele. Type No. 3026, IT. S. National Museum . melitxvw n. sp. 

 Seutellum black, i)robably four i)Ostsutural macrocha?ta% but the 

 anterior pair is wanting in the type specimen, four sterno- 

 plenrals; black, the palpi, sides of first three segments of abdo- 

 men except the front corners, tibia^, and apical third of under 

 side of each femur yellowish; front of male one-half as wide as 

 either eye, no orbital bristles, frontals descending to middle of 

 second joint of antennie, cheeks one-third as broad as the eye- 



