OF WASHINGTON. 263 



53. Crossvein at apex of anal cell nearly perpendicular to the hind margin 



of the wing 54 



Crossvein nearly parallel with hind margin of wing, proboscis thick, 

 nearly as long as height of head, almost perpendicular, 



Gloma Meig. 



54. Anterior branch of third vein terminating in the costa, 



Brachystoma Meig. 

 Anterior branch terminating in the second vein, 



Blepharoprocta Loew. 



55. Upper side of body never metallic 56 



Upper side of body metallic green, brassy, or bluish, 



Lamprempis W. & M. 



56. Proboscis at most as long as height of head 57 



Proboscis longer than height of head, crossvein at apex of anal cell 



parallel with hind margin of the wing 59 



57. Axillary angle strongly projecting 58 



Axillary angle only slightly projecting, crossvein at apex of anal cell 



nearly perpendicular to the hind margin of the wing..^?<r7^vrs Walk. 



58. Antennae three-jointed, the third joint conical, arista rather long, 



Hilara Meig. 



Antennae very short, apparently two-jointed, the third joint oval, 

 arista and proboscis very short Hormopeza Zett. 



59. Direction of proboscis downward 60 



Direction of proboscis forward, arista very short Iteaphila Zett. 



60. Face bare 61 



Face hairy Empimorpha Coq. 



61. Hind legs not longer than the others, hind femora much thickened, 



eyes separated Pachymeria Steph. 



Hind legs longer than the others, hind femora not or only slightly 

 thickened Empis Linn. 



62. Front femora thickened 63 



Front femora slender Roederiodes Coq. 



63. Discal cell united with one of the other cells (type, Hemerodromia 



collusor Melander) , Metachtla, n. gen. 



Discal cell separate, distinct Cheltfera Macq. 



NOTES. 



Mici<ophorus Jlavipilosus Coq., M. crocatus Coq., and M. 

 ravidus Coq., all belong to Microphorus*&$> originally referred, 

 while M. atratus Coq. belongs more properly to Anthalia. 



The genera Holoclera and Euthvneura do not occur in this 

 country, so far as I am aware. Holoclera bilineata Melander 

 belongs to Microphorus, while H. sycophantor Melander be 

 longs to Anthalia. Euthyneura aperta Melander, E. stentor 

 Melander, and E. atripes Melander, are all referable to Micro- 

 phorus ; while E. nura Melander and E. bulbosa Melander 



