24 AMERICAN ENTOMOLOGY. 



Desc. Head yellow, a dusky line above the antennae ; orbits 

 yellow to the vertex ; antennae blackish on the superior edge : 

 thorax dark green-bronze ; a yellow spot before the wings ; scu- 

 tel bright yellow ; feet whitish ; anterior tibia and tarsi a little 

 dilated, the latter with short joints; posterior thighs with one 

 obsolete band, their tibia two banded ; extremity of all the tarsi 

 dusky ; tergum black ; first segment with a yellow basal edge ; 

 second segment with a band at base, interrupted into two oblong 

 triangles, and a broader one on its middle, yellow ; third segment 

 with one arquated band ; fourth and fifth segments each with an 

 oblique oblong-oval spot each side, and two longitudinal lines on 

 the middle, yellow. 



Variety /?. Band of the third segment of the tergum inter- 

 rupted into four small spots. 



Obs. A very pretty insect, not uncommon in gardens on flowers, 

 leaves, &c. The sexes are alike in color and markings. 



The left figure of the plate. (This figure represents the 

 variety.) 



Syrphus politus. — Specific character. Thorax with a yel- 

 low line each side, and a cinereous dorsal one ; tergum with yel- 

 low bands and quadrate spots. 



Scseva polita nobis, Journ. Acad. Nat. Sciences, vol. iii. p. 88. 



Desc. Head yellow, above the antennae dusky silvery ; thorax 

 somewhat olivaceous, a yellow line above the wings, and a dorsal 

 cinereous one ; scutel dusky yellowish, With a paler margin ; feet 

 whitish • tergum black ; basal segment with the basal and lateral 

 edges yellow ; second segment with a transverse yellow band on 

 the middle ; third and fourth segments with a band and longi- 

 tudinal line, each side of which latter is a large, transverse, sub- 

 triangular yellow spot, yellow ; fifth segment with the yellow 

 spots and base, but destitute of the longitudinal line. 



Obs. This species, like the preceding, is very agreeably orna- 

 mented with the yellow lines and spots that characterize it, and 

 like that species it is not unfrequent, yet I have but two imper- 

 fect specimens, wihch are both females. 



The right figure of the plate. 



