SYNOPSIS OF NOKTH AMERICAN SYRPfelDJ-:. 229 



tibiae iu the middle, more broNAiiisli; liiud femora moderately tijickened, 

 hind coxai without tubercle below. Wiugs nearly hyaline, stigma brown. 

 One specimen. 



Xylota bicolor. 



Xijlota bicolor Loew, Centur., v, 39. 



Habitat.- — Pennsylvania ! 



S . Length, 13""". Face and front black, thickly grayish yellowish 

 ilusted, except on the cheeks, which are bare and shining. Antennse 

 black, third joint large, somewhat reddish below near the base. Dor- 

 *;um of thorax shining bronze black, clothed with light yellow, rather 

 long pile; pleiime shining black, with whitish pile. Abdomen: first 

 segment shining black with whitish pile, its posterior angles narrowly 

 and the remainder of the abdomen, including the hyimpygium, bright 

 orange red with golden pile. Legs black, white pilose; the base of 

 front and middle tibicX- and the first two joints of the front and middle 

 tarsi light yellow or white; hind coxa' rounded, not tuberculate, hind 

 femoia considerably thickened, wings hyaline; stigma luteous. 



Two specimens, fiom Mr. Eugene Keen. 



Xylota ejuncida. (Plate XI, figs. 8, 8a.) 



Xijhta ejuncida Say, Amer. Eut., i, pi. viii ; Compl. Wr., i, 15; Wiedemann, 



Auss. Zw. Ins., ii, 100, 5. 

 Xylota Baton Walker, List, etc., iii, c.54. 



? Xylota qnadrimaculata Loew, Centur., vi, of). ' 



Xyiota anmdifera Bigot, Auuales Soc. Eut. Fr., 1884, 545. 



Habitat.— Over the whole United States. 



3,2. Length, 9 to 10™"\ Face much receding to considerably below 

 the middle; black, rather thickly clothed with gray pollen. First two 

 joints of antenna? black, third red or brownish red, oval, longer than broad, 

 the arista wholly black. Frontal triangle thickly covered with grayish- 

 yellowish pollen; front of female narrow above, bright shining black, 

 excei)t a narrow pollinose cross-band below the middle. Dorsum of 

 thorax shining metallic green or greenish black, a sericeous spot at the 

 inner side of each humerus ; i)ile of scutellum short, yellow ; on the meso- 

 pleura^ longer, white. Abdomen: first, fourth, and following segments 

 shining greenish black; second and third opaque black, with abroad, 

 yellow, shining, short yellowish pilose, interrupted cross-band; else- 

 where the ])ile of the abdomen is short and black, ex-cept a white spot 

 on each side of the fourth segment ; in the male the yellow spots are 

 somewhat smaller, and sometimes partly obscured. Legs black, base 

 of all the tibiaj and the first two, or more usually the first three, joints 

 of the front and middle tarsi light yellow; the front and middle tibiai, 

 except their base, and the hind tarsi, brownish, the second joint of the 

 hind tarsi more yellowish ; hind femora moderately thickened, less so in 

 the female; hind coxae of the male with a small, sharp spur below. 



