112 



11. Palpi yellow, the ^rcc uppermost froutal bristles in each row 



noticeably longer than the next ones ll*. 



Palpi, except the apices, black, the tkcae uppermost frontal bristles 

 not longer than those below them, no hairs below the lowest 

 cues, vibrissje on a level with front edge of the oral margin; 

 black, the apices of palpi and of scutellum, yello\v^ no orbital 

 f^jtixXiJ^ ^'O'^ o . tjellar bristles in the male, frontal bristles descending to 

 JiC^, f o^ base of third antennal joint, cheeks one-fifth as broad as the 

 eye height, facial ridges bristly on the lowest fourth, antennae 

 nearly as long as the face, the third joint twice as long as the 

 second, penultimate joint of arista slightly longer than broad; 

 thorax gray polliuose, marked with four black vittiie, abdomen 

 gray pollinose on the last three segments, with reflecting darker 

 spots, tbe narrow hind margins of the segments shining black, 

 hairs depressed, first three segments bearing marginal macro- 

 chsetfe., wings hyaline, slightly tinged with yellow basally, 

 third vein bearing two bristles at its base, fourth vein beyond 

 the bend nearly straight, calypteres whitish; front pnlvilli 

 slightly longer than the last tarsal joint; length, 9 mm. Colo- 

 rado. A single male specimen collected by Mr. Carl F. Baker. 

 Type No. 3(513, U. S. National Museum hakeri n. sp. 



12. Front in the nmle as broad as, in the female one and oiie-fourth 



times as broad as, either eye, third joint of antenuiPAtwo and 

 one third times as long as the second, apical i)air of macro- 

 * chieta'. on scutellum curving backward and nearly horizontal, 



vibrissa' noticeably above the level of front edge of the oral 

 margiUv^<r^ta thickened on the basal three-fifths; length, 11 

 nim.XS<^rseheck Beach, Mass.; southern Illinois, and Florida. 

 (Biol. Cent.-Amer., Diptera, Vol. II, p. 110; March, 1890: Masi- 



cera.) y.^-^t-b - -^F-.-.-./:>u.,- H-c/to "^^^'/'il^iii" l" i'. ^i'. 



Front in the male two-thirds, in the female four-fifths, as wide as 

 either eye, third joint of antenn;e four times as long as the sec- 

 ond, arista thickened on the basal two-fifths, vibrissfe on a level 

 with front edge of the oral margin, apical pair of macrocha^tte 

 ^^ j-^^..^r^-^yuL^CL on the scutellum curving forward and suberect; black, tlie 

 ^x„^^ palpi, and sometimes apex of scutellum and sides of the second 



(/ abdominal segment, hind angles of the first and front angles 



C^AtJ^^CLM^/ -^-"M^ ^£ ^jjg third, yellov/; frontal bristles descending slightly below 

 ^vft^^r /. 7^ /i'«'-'-**-<^the arista, sides of front bearing numerous bristly hairs and 

 Cr-^ .v-^-v^^ • 2^- *T)ne or two macrochiietiie, two i^airs of orbital bristles in the 

 Ou<^ ■ ^ • i • lA/-'^ female, none in the male, cheeks one-fifth as broad as the eye- 

 i,,v-*/v^-*l-4t^ height, facial ridges bristly on the lower ha lf, the bristles 



^ ascending two-thirds or more of distance from the vibrissa' to 



the lowest frontal bristles, antenna' nearly as long as the face, 

 penultimate joint of arista slightly longer than broad; thorax 

 gray pollinose, marked with four black vittte, abdomen on last 



