DOLICHOPODIDJS. 81 



38. Pulvilli of male fore tarsi conspicuously enlarged. EUTARSUS Loew. 

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



39. Thorax 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 antennae. . . 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. LYRONEURUS 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. . 43 



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



CHRYSOTUS, pt. 

 Arista dorsal or subapical; fore pulvilli of male elongated. 



DlAPHORUS, pt. 



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

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



10 



