SYNOPSIS OF NORTH AMERICAN SYRPHID^. 105 



TABLE OF SPECIES. 



l._Hypopygiuni very small ; coxae and bajse of femora black micmra 



Hypopygium large 2 



2.— Coxu3 aud base of femora blackish melanosa 



Coxie or at least femora not blackish ( J ) 3 



3. —Hypopygium with a tuft of yellow pile below the globular part in front, 



cylindrica 



Hypopygium without such a tuft, base sulphuripea 



For other species see descriptions. 



Sphaerophoria cylindrica. (Plate IV, figs. 1(3, 16a.) 



Si/rplius cijUndricus Say, Amer. Eut., i, pi. xi ; Compl. Wr., i, 22; Wiedemann^ 



Auss. Zw. Ins., ii, 138, 38. 

 Sphoerophoria contigiia Macquart, Dipt. Exot., 2* Suppl., 62, 4. 



Babitat. — l^ew England, Washington Territory! 



S . Length, 8°"». Face aud front light yellow, shining; tubercle and 

 anterior oral margin somewhat fuscous. Antennae reddish yellow, 

 brownish above on third joint. Dorsum of thorax dark greenish oliva- 

 ceous, somewhat shining, with an abbreviated lateral yellow stripe j 

 pleurae deep shining, somewhat bluish black, with light yellow spots, 

 scutellum. sulphur yellow. Abdomen slender; first segment black; 

 second segment opaque black in front, with a broad yellow cross-band 

 in the middle, opaque brown or black behind; third segment narrowly 

 brown or blackish in front and behind, elsewhere reddish yellow; fourth 

 segment yellow aud obscurely brownish ; fifth segment and hypopygium, 

 wholly reddish yellow, the latter globose and with a tuft of pile below 

 in front. Legs yellow, including the coxse. Wings nearly hyaline, not 

 exceeding the abdomen. 



This description applies nearly to typical specimens, but there is 

 much variation, how much of which is varietal and how much specific 

 I cannot say. The following are some of the differences I have ob- 

 served : 



{a) $ . Larger (10'"'»), abdomen slender, banded, more blackish; yel- 

 low lateral stripes of thorax entire. ]Sfew England, Washington Terri- 

 tory. 



{h) <?. Smaller (G"""), abdomen more blackish, coxse black, base of 

 femora blackish. 



(c) 9 . Front shining black, yellow on the sides below; yellow lateral 

 .stripes of thorax entire. Abdomen moderately broad, shining black 

 with three moderately arcuate, slender, entire bands, reaching- the 

 lateral margins; fifth segment with an interrupted band; coxoe and 

 legs yellow; face yellow. New England. 



(d) 9 . Face with an elongate, oval, shining black spot; lateral tho- 

 racic stripes abbreviated at the suture; abdomen slender, black, with 

 three yellow bands, narrowly opaque in front aud behind these; fifth 

 segment with a yellow hind margin. New England. 



