DOLicnoroDiD^.. 81 



08. Pulvilli of male fore tarsi consi>icuously enlarged. Eutarsus Loew. 

 Pulvilli of male not enlarged. . . . Chrysotus pt. Miegen. 



39. Thora.x bright green, abdomen yellow, with a good deal of silvery pol- 



len Leucostola Loew. 



Not so marked. .......... 40 



40. Face broad, the palpi large, reposing on the proboscis; small, pollinose 



species, with yellow antenna?. . . Thinophilus Wahlberg. 



Palpi of ordinary size or else projecting lamelliform, free from the 



proboscis 41 



41. The third longitudinal vein (in the male) keeps close to the second till 



near the tip of the latter, then makes a wide curve backward ; the 



third and fourth veins farther apart than usual. Ij.TEia3SBlLElIS.Loew. 



Wings of ordinary structure. ....... 42 



42. Third joint of antennae in the male conspicuously long, awl-shaped, not 



wider at the base than the first joint, . . Rhaphium Meigen. 

 Third joint long, lancet-shaped, wider at the base than the first joint. 



PoRPHYROPS Meigen. 

 Third joint short, the tip sometimes drawn out into a point. . 4o 



43. Arista nearly or quite apical ; fore pulvilli of male not enlarged. 



Chrysotus, pt. 

 Arista dorsal or subapical; fore pulvilli of male elongated. 



DiApnoRus, pt. 



Arista dorsal, inserted quite near the base of the joint ; pulvilli plain ; 



abdomen of male slender, compressed. . . Sympvcnus Loew. 



10 



