118 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



13. A distinct median gray line divides the broad, central dark-brown stripe of the 



mesonotum (California) trucis Coquillett. 



The central stripe not so divided (Montana; Saskatchewan; New Hampshire). 



montana, new species. 



14. First antennal joint greatly elongated and swollen, its vertical diameter over ^ that 



of the head (British Columbia; Alberta; Washington; Montana; Colorado; 



Utah; California) atripes Bigot. 



First antennal joint much smaller, its vertical diameter only about | that of the 

 head 15. 



15. Rather velvet-black species, pile of abdomen yellow (British Columbia; Washing- 



ton) kincaidi, new species. 



Almost shining species, pile of abdomen black (Colorado) pullata Coquillett. 



FEMALES. 



1. Third joint of antenna concave at apex, below the arista 2. 



Third joint convex as usual 5. 



2. Abdomen yellow in ground color (Washington; California). . sackeni, new species. 

 Abdomen black 3. 



3. Sides of face with a little pile (Washington; California) johnsoni Coquillett. 



Sides of face bare 4. 



4. Mesonotum with three brown stripes, all narrow and very distinct (California). 



securifera Coquillett. 

 Mesonotum with indistinct, broader, unequal stripes (Idaho; Montana; California). 



inurbana, new species. 



5. Knob of halteres infuscated 6. 



Knob yellow 11. 



6. Abdomen shining black, broadly red at apex (California) limata Coquillett. 



Abdomen not as indicated 7. 



7. Sides of face pilose 8. 



Sides of face bare 10. 



8. Proboscis slender, longer than height of head (California) cruenta Coquillett. 



Proboscis shorter, with broad, fleshy labella 9. 



9. Pale plumbeous species, the hairs above the notopleural suture white (Mon- 



tana) plumbea, new species. 



Much darker, the hairs above the notopleural suture black (Oregon; California; 

 Montana — comata Bigot) pachyceras WilUston. 



10. Front above antennae as wide as the eye; tibiae black (Alaska; British Columbia; 



Alberta; Montana; Washington; Colorado; Utah; California) ainpes Bigot. 



Front above antennae much wider than the eye; tibiae yellow (Saskatchewan; 

 Montana; California; New Hampshire) montana, new sj)ecie3. 



11. Tibiae black, knees narrowly reddish 12. 



Tibiae yellow 13. 



12. Front above antennae about one-half wider than the eye (Idaho; Washington). 



inquisitor, new species. 

 Front above antennae about as wide as the eye (Washington; British Columbia). 



kincaidi, new species. 



13. Abdomen shining reddish-brown except the first segment (British Columbia; 



Washington; Nevada — picticornis and latipalpis Bigot) j^lagens Williston. 



Abdomen black in ground color 14. 



14. First antennal joint yellow, the rest black (California) modesta Coquillett. 



First joint not paler than the others 15. 



