'i3S INSECTA SAUNDERSIAN.A. 



base : the black triangles in tlie disk of the abdomen mnch smaller than 

 those of the male. 



Length of the body 2i lines ; of the wings 5 lines. 



Var. ^. Black colour in the third and fourth segments much more 

 prevalent. 



United States. 



Syri'hus interrogans, Fem. 



A^neus, capite antico thoracis laterihus scutelloque fulvis, abdomine nigra 

 fasciis fulvis ornato apice eeneo, aniennis pedibusque fulvis, femoribus 

 tibiisque posticis piceo cinctis, alis sublimpidis. 



Head metallic green, purple on the crotvn, taivny in front and on the 

 sides above the feelers, tinged with hoary, and clothed with white hairs be- 

 hind and beneath : chest and breast bronzed ; sides of the chest and hind 

 border of the scutcheon tawny ; a short yelloiv band on each side of the 

 breast : abdomen blacky nearly spindle-shaped, much longer but not 

 broader than the chest, adorned with four irregular taivng bands, the first at 

 the base ; hind border of the second forming four curves, its disk adorned 

 with four P-shaped black marks; third like the second, but its hind 

 part is still more enlarged ; fourth small, interrupted in the middle ; tip 

 bronzed, hind borders of its segments tawny: legs taivny; feet darker ; a 

 pitchy band near the tip of each hind-thigh ; two indistinct pitchy bands on 

 each hind-shank; hind-feet pitchy: wings nearly colourless; wing- ribs 

 tawny ; veins black, tawny at the base ; poisers tawny. Length of the 

 body 2^ lines ; of the wings 5 lines. 



North America. 



Syrphus Barbula, Fem. 



^neo-viridis, abdomine fusco suturis nigris, pedibus fulvis posticis pi- 

 ceis, alis subcinereis. 



Brassy green : head bluish green, brassy on the crown ; a pale yellow 

 stripe widening in front along each side of the face ; hind-head tinged with 

 gray, clothed with hoary hairs : sides of the chest and hind-border of the 

 scutcheon somewhat pitchy ; a yellow band on each side of the breast : ab- 

 domen brown, spindle-shaped, with a slight brassy tinge, much longer than 

 the chest, sometimes bronzed with pitchy sides ; sutures of the segments 



