SYNOPSIS OF NORTH AMERICAN SYRPHID^. 81 



Some rare speciineus of both sexes are ouly 8""" loug. 



I coiiii)ared about uiuety male and female specimens, principally 

 from tlie White Mountains ; also from Maine, Massaclmsetts, i?ew York, 

 etc." — Osten Sacken, 1. c. 



Baron Osten Sacken could see n^ difiereuce between S. lesueurii and 

 a specimen from Europe labeled " Silesia," whicb be compared. 



Two female specimens from Wasbin^iton Territory agree in every re- 

 spect with numerous specimens which I have from Mount Washington. 

 In one the abdominal cross-bands are strongly bluish. 



Syrphus abbreviatus. 



Scwva ahhrcnala Zcttcrstetlt, Dipt. Scaud., viii, :U3C, 115 (female). 



Sfirphus cxcians Sehiuer, Fauna Aiistr., i, :U1 (in part). 



Sipyhius ubbnriaius Osten Sackeu, Pioc. Bost. Soc. Nat. Hist., xviii, 144. 



Habitat. — Connecticut, Massachusetts !, Europe. 



" 5 , $ . Length, about 8™"'. Male. Face yellow ; cheeks black, which 

 color coalesces with the brown oral borders, and is connected under 

 the oral opening with the black on the opposite side ; in some speci- 

 mens the facial tubercle is also brownish ; third antennal joint brown- 

 ish, more or less reddish on the under side, sometimes altogether 

 reddish ; front yellow ; no brown spot above the autennoB ; vertex 

 blackish -bronze color. Eyes bare. Thoracic dorsum rather bright 

 brassy -green. Yellow spots on second abdominal segment rather 

 large, obliquely triangular, touching the margin with the apex only ; 

 the interval between them moderately broad, equal to about one-third 

 or one-fourth of the breadth of the spot; yellow bands on segments 

 three and four rather broad, much broader than the black band between 

 them ; the posterior margin in both is sinuate in the middle, more 

 markedly in the band of the third than of the following segments; the 

 bands do not reach the abdominal margin, and are cut off obliquely on 

 the sides; the distance of their anterior corner from the magin is very 

 small, however; fourth segment with a narrow yellow border posteriorly; 

 fifth segment yellow with a small transverse black spot in the middle, 

 near the base. Legs yellow, but base of all the femora black ; on the 

 hind femora the black occupies one-third or one-half the femur. 



Female. Eesembles the male, but with the following differences : lower 

 part of the front above the antennre, yellow; upper i)art and vertex 

 brownish green ; oral border less infuscated, the infuscation being usually 

 distinct in the middle of the excision ouly ; the yellow spots on the 

 second abdominal segment are larger, the interval between them nar- 

 rower, often liniear, sometimes obsolete ; the bands on the third and 

 fourth segments are com])aratively narrower than in the male ; and but 

 little broader than the interval between them; their hind margins are 

 gently concave-sinuate in the middle, and convex-sinuate each side; 

 both bands distinctly reach the abdominal margin ; fifth segment yel- 

 low, with a triangular black spot in the middle ; coxse black, but femora 

 altogether yellow (the four anterior femora in some specimens are black 



