SYNOPSIS OF NORTH AMERICAN SYRPIIIDiE. 157 



Sericomyia chysotoxoides. (Plate VII, ligs. 4, 4a.) 



SeHcomyia clmjsotoxoides Macquart, Dipt. Exot., ii, 2, 19, 1; pi. iii, fig. 3 bis. 



(male). 

 Sericomyia limbipennis Macquart, ibid., 2o Suppl. 58, 2 (female). 

 Sericomi/ia filia Walker, List, etc., iii, 596. • 

 Eahitat. — Atlantic States, Canada. 



5,9. Leugtb, 10 to 12'""'. Face shiuiug, whitish pollinose on the 

 sides; yellowish- white, with similar colored pile; cheeks aud a median 

 stripe (which is broadest iu its middle, and scarcely reaches the an- 

 tennce), black ; in protile considerably concave below the anteuuse. An- 

 tennae black ; third joint about twice as long as broad, rounded on its 

 outer angles ; arista black. Front black, shining, opaque across the ■ 

 middle, on the sides below with yellowish gray dust; pile black. Oc- 

 ciput black, whitish pollinose on the lateral orbits, and with white pile. 

 Thorax black, shining ; dorsum with two faint, median, slender, pos- 

 teriorly abbreviated, opaque stripes; pile sparse, obscurely yellowish or 

 blackish, on the sides with a tuft of yellow pile. Scutellum shining 

 black ; pile iu large part yellow. Abdomen black, opaque, with the 

 fascijB more oblique, a little broader and more distinctly interrupted 

 than in S. cluacopyga ; second segment narrowly ; third segment more 

 broadly, aud the fourth for nearly half its width on the posterior part ; 

 the fifth wholly, shining greenish -black ; pile whitish-yellow on the 

 sides in front, the lateral margins, and the posterior portion. Legs 

 yellow; anterior and middle femora black on the basal half, the poste- 

 rior pair either not at all or a spot near the middle in front; iu the 

 male all the femora except their end black, the last two joints of all 

 the tarsi also black. Wings a little clouded on the inner part; in front 

 yellowish-brown with yellowish veins; on the outer part from the first 

 to the third veins blackish ; cross- vein before the middle of the discal 

 cell. 



Twelve specimens. 



The antennte in the male have the third joint broader toward the end, 

 whereas in the female it is a little narrowed. There can seem to be no 

 doubt of the synonymy of 8. Umbipennis, described from a female, with 

 S. chrysotojioides, described from a male. 



ARCTOPHILA.* 



ArctopUla Schiaer, Wien. Entom. Monatschr., iv, 215, 1860; Fauna Austr., i, 

 331. 

 Large, thickly pilose species; black, but through the pile light in 

 appearance. Very similar in structure to Sericomyia, but distinguish- 

 able by the thick pilosity, by the form of the face, which is straight, 

 conical, descending much below the eyes, not truncate, but pointed at 

 the tip; the abdomen is shorter, broader, and more convex above; the 



""^p/cTOf, bear, and ipilog, dear. 



