1882] ^1" [Williston. 



— Hind femora distinctly swollen, bands of thorax conspicuous, third 

 segment of abdomen in female often with red or yellow side spots, 

 otherwise resembling the previous species very much, and like it 

 quite variable mnetorum. 



11. — Third segment of abdomen broadly and conspicuously yellow, joining 

 the yellow of the second segment in front, the velvety fascia of third 

 segment abbreviated on the sides ; thorax with indistinct stripes ; eyes 



of male touching each other very slightly fMeigenii Wied. 



— Third segment of abdomen without yellow, eyes of male broadly con- 

 tiguous 13 



12. — Front of female narrow. Deep bluish-black, scutellum scarcely dif- 

 ferent, the abdomen with dull or obsolete triangular spots, the hind 

 borders of the segments indistinct or absent, conical ; tips of femora, 

 the posterior at the base especially in the female, basal half of tibi«, 

 and more or less of basal joints of anterior and middle tarsi, light 



yellow. Wings with a dark spot saxorum. 



— Front of female broad. Lighter markings of abdomen (the lateral tri- 

 angles and posterior borders) usually quite distinct, sometimes 

 nearly obsolete ; third and fourth segments with a velvety median tri- 

 angular expansion with its base in front ; tips of femora, anterior and 

 middle tibise, except tips and basal half of posterior tibite yellow. 

 Wings sometimes with a distinct brown spot Jurtus. 



13. — Third segment without (or with very minute) velvety markings, 

 abdomen mostly shining, second, third, and fourth segments with 



fringe of white pile 14. 



— Third segment of abdomen with an anterior spot, and a posterior 

 interrupted velvety black fascia, second segment with sub-obsolete 

 triangular yellow spots, posterior border of segments narrow or in- 

 distinct ; basal half of all the tibiae yellowish-white. Wings pure 

 hyaline dimicUatus. 



14. — Second segment of abdomen with yellow triangles, and a posterior 

 uninterrupted or subinterrupted velvety cross-band, posterior mar- 

 gin of segments 2-4 yellowish-white, with a fringe of pale golden yel- 

 low hairs. (Length 9-13 mm.) stipator. 



— Second segment except the metallic side spots that extend the whole 

 length of the segment, velvety black ; third segment with a velvety 

 triangle in front, the fourth with similar, but very small ; the yellow- 

 ish-white hind borders fringed less conspicuously with light colored 

 pile Brousii, sp. nov. 



Eristalis inornatus Lw., Centur. vi, 68. Red River. 



Diagnosis, translation. $. " Sub-brassy black, shining, clothed with 

 rather long lutescent pile ('pube') ; front broad, near the eyes black 

 pilose, but the vertex itself with luteous pile ; eyes pilose ; antennae red- 

 dish ferruginous, the first two joints black, the arista pilose ; face, except 

 the usual stfipes yellow, with dilutely lutescent pile and pollen ; scutel- 



