13- -5- (Sphaerophorid) cylindrictts. f\ in.; chest metallic olive green; body rust yellow: first 

 ring black. 



14. S. obliquus. % in. ; chest metallic green ; body black, with two yellow bands and eight stripes. .. 



15. S. geminatus. % in. ; chest black, with yellow sides; body black, with yellow bands, double 



spots and stripes ; legs yellow. 



16. . marginatns. T % in. ; chest black, with yellow sides; body black, with yellow bands, spots, 



streaks and edges ; legs yellow. 



TRIODONTA. (POLYDONTA.) (MERODON.) Shanks Fly. 



1. T. curvipes. y z in.; black, with yellow hair; body reddish, with a black triangle above ; 



hind shanks thickened. 



2. T. (Merodon) bctrdus. |^ ' n - ! shaped like curvipes; chest, first ring and sides of body 



covered with yellow hairs. 



SERICOMYIA. 



1. .9. chrysotoxoides. l /> in.; black, with yellowish hair on chest, and whitish marks 



on body. 



2. S. militaris. V? in. ; white and black. 



(42) 



