AMERICAN ENTOMOLOGY. 23 



ried with yellow ; abdomen, excepting the base of the tergmn, 

 yellow-ferruginous. 



Desc. — Male. Head yellowish-white, somewhat silvery, pol- 

 ished ; antennae more deeply tinged with yellow ; tubercle of the 

 hypostoma a little dusky at tip ; eyes chestnut ', thorax dark 

 greenish-olivaceous, spot before the wings and scutel, yellow; 

 pleura black with yellow spots ; pectus black ; feet, including 

 the coxne, pale yellow ; tergum yelloAvish-ferruginous ; first seg- 

 ment and base of the second black j tip of the second segment 

 either dull ferruginous or blackish ; third segment dull yellow, 

 somewhat ferruginous at base and tip ; venter yellow at base, fer- 

 ruginous towards the tip. 



Ohs. I have seen but two specimens, which are both males, 

 taken near Philadelphia. In form of body it resembles the S. 

 scalaris, Fabr., and tseniatus, Meig., of Europe. 



The upper figure of the plate. 



[Belongs to the genus Sj)hxro]jliorla Macq. — Sacken.] 



Syrphus obscurus. — Specific character. Blaekish-green ; 

 tergum with lateral full cupreous triangles. 



Desc. — 3Iale. Head metallic black, tinged with green ; antennae, 

 third joint dull testaceous ; stcthidium entirely blackish-green, 

 polished, immaculate ; feet dull testaceous, thighs blackish at 

 base ; tergum velvet-black, slightly tinged with green ; second 

 segment with a dull coppery semioval spot on the middle of the 

 lateral margin, extending on the edge to the base and tip ; third 

 and fourth segments each with a large dull coppery triangular 

 spot on each side at base, approaching closely towards each other 

 on the basal margin, and extending on the lateral edge nearly to 

 the tip; an obsolete, longitudinal, central, dull coppery line, 

 widely out spread on the posterior margin, so as to attain to the 

 posterior angles ; venter purplish or dusky, highly polished. 



Obs. Of this also I have seen but two specimens, both of which 

 are males ; one was taken near Philadelphia, and the other at 

 Chinquoteage, Virginia. 



The lower figure of the plate. 



Syrphus obliquus. — Specific character. Thorax green- 

 bronze, with a yellow dot before the wings ; tergum bounded 

 and spotted with yellow. 



Scxva ohliqua nobis. Journ. Acad. Nat. Sci., vol. iii. p. 89. 



