28 DIPTERA OP NORTH AMERICA. [PART II. 



B. Cilia of the tegulse black. 



1. Fourth longitudinal vein broken. 



a. Antennse black. 



23. ramifer Lw. 



b. Antennae yellowish-red. 



24. bifractus Lw. 26. cuprums Lw. 



25. vittatus Lw. 27. longipennis Lw. 



2. Fourth longitudinal vein not broken. 



a. Antennse red, at the utmost the third joint at the tip 



almost entirely red. 



a. Humeral callosity of the same color with the 

 thorax. 



28. hastatus, n. sp. 31. sexarticulatus, n. sp. 



29. plumipes Scop. 32. ruficornjs Lw. 

 ( 30. fulvipes Lw. 



B. Humeral callosity yellowish. 

 33. scapularis Lw. 34. funditor Lw. 



b. Antennse black, at the utmost thefirst joint partly red. 



35. chrysostomus Lw. 39. discifer Stann. 



36. praeustus Lw. 40. lobatus Lie. 



37. comatus Lw. 41. setosus Lw. 



38. scoparius Lw. 42. iucisuralis Lw. 



