SYNOPSIS OF NORTH AMERICAN SYRPHID^. 227 



blackislj. Abdomeu: first segmeut bronze black, sliiuiiig; fourth seg- 

 meut aud the followiug very brilliaut goldeu bronze; second segmeut 

 opaque bhick, on each side with a hirge triangle shining yellow, its 

 outer border bronze; third segment simihir, but the bhick not as exten- 

 sive on the front margin and the yellow not tilbng out the whole of the 

 triangle, which is elsewhere shining bronze like the fourth segment; pile 

 yellow, except on the opaque black portions, where it is black. Legs 

 black; the immediate tip of all the femora, the buse of all the tibioe, 

 aud the rather broad tip of the front and middle libijc, the narrow tip 

 of the hind tibiae, and the first two joints of all tlie tarsi, reddish yellow; 

 hind femora moderately thickened, hind coxie with a slender sharp spur 

 in the male, hind tibiiE without a spur at the tip; pile of legs white. 

 Wings nearly hyaline, stigma brownish; third longitudinal vein beyond 

 the cross vein gently but distinctly curved backward. 



One male, California (Baron), and two females. New Mexico (Gaumer), 



Xylota pigra. (Plate XI, figs. 7, 7a.) 



Siirphus p\(jer Fabricins, Syst. Eutoiu., iv, 2'J5, 63, 1794. 



Milesia pigra Fabricins, Syst. Antl., 192, 16; Fallen, Syrph., ii, 7 var. B; La- 



treille. Gen. Crust., iv, 331. 

 Xyloia pigra Meigeu, Syst. Bescbr., iii, 221, 14; Zetterstedt, Dipt. Scaud., ii, 



878, 12; viii, 3192; Loew, Amer. Jour. Sci., xsxvii, 317. 

 Milesia hamafodes Fabricius, Syst. Antl., 193, 21. 

 Xylota hwmatodes Say, Amer. Ent., i, pi. viii; Conipl. Wr., i, 16; Wiedemann, 



Anss. Z\v. Ins., ii, 99, 3; Macquart, Dipt! Exot.,ii, 2, 73; pi. xiii, fig. 4. 

 Xylota crassipes Wahlberg, Acta Holm., 1838, 15, 7. 

 .' Xyloia ruUiginigaster Bigot, Ann. Soc. Ent. Fr., 1884, 543 (Teneral ?). 



Habitat. — Atlantic aud Pacific States, Europe ! 



5,9. Length, 11 to 12'"°\ Antennal process prominent, below the 

 anteunaj receding to beyoud the middle, then directed downward and 

 forward. Face black, thinly clothed with whitish pollen, shining on 

 the cheeks. On the frontal triangle, except just above the antennae, 

 polliuose. Front iu female shining, a narrow, lightly pollinose band 

 across the middle. Antennai black, third joint brownish black. Thorax 

 black, but little shining, finely roughened, with a purplish or bronze 

 reflection, nearly bare, the pile very short, black, more or less white in 

 front ; on the inner side of the humeri a large pollinose spot. Abdomen 

 dark shining red, iu the male usually more orange-colored, on the poste- 

 rior segments frequently brownisli or brown, the hypopygium piceous; 

 first segment, escept the small hind angles, shining black; the second 

 with a black triangle in front, its tip reaching to or beyond the middle 

 of the segment. Legs black, sometimes more brownish: tarsi and 

 knees a little lighter colored ; hind femora much thickened, in the male 

 a little more so than in the female, and with short spinous bristles the 

 whole length below, longer on outer part; hind coxae of the male 

 rounded below, without spur or protuberance; hind tibiae in both sexes 

 with a spur at tip. Wings nearly hyaline behind, in front and outer 

 part more or less blackish or brownish ; stigma darker. 



