FAMIIA" SVRPHID.i: THE FLOWER FLIES 261 



65. Mesonotum with distinct yellow markings in addition to those on the 



humeri 78 



Mesonotum without distinct yellow markings, although the humeri 

 may be yellow, sometimes partly or wholly pollinose 6G 



66. Third longitudinal vein moderately curved into the apical cell 83 



Third longitudinal at most slightly curved into the apical cell 67 



67. Face produced downward; usually an indication of facial tubercle. ... 68 

 Face produced well forward and somewhat downward or evenly con- 

 cave and not produced downward 72 



68. Pile long and furry; flies bumble-bee-like in appearance 69 



Pile shorter; flies not bumble-bee-like 70 



69. Arista placed at the tip of a conically produced third antennal seg- 



ment (98, 110) Merapioidus Bigot 



Arista dorsal, not situated on a prominence (.54, 114) . '''Criorrhina Meigen 



70. Antennje inserted on a long, conical prominence; face retreating 



below (115, 123) Somula Macquart 



Antennas not situatetl on a strong prominence, inserted lower down on 

 the head; abdomen shorter and broader 71 



71. Posterior femora swollen and with an apical projection below; abdo- 



men of the male rather slender, wholly black (116, 126). 



Cynorhinella Curran 

 Posterior femora simple (60, 63, 64) tCynorhina Williston 



72. Epistoma produced forward and downward (117, 152). 



Crioprora Osten Sacken 

 Epistoma not produced downward or forward beyond the antennal 

 prominence 73 



73. Bumble-bee-like flies, the pile very thick (118, 127). 



Pocota St. Fargeau and Serville 

 Not bumble-bee-like, the pile rather thin 74 



74. Face tuberculate $Calliprobola Rondani 



Face concave or carinate 75 



75. Face carinate; posterior femora greatly swollen §Planes Rondani 



Face concave in profile 76 



76. Pile of the scutellum thick and rather long but not concealing the 



ground color; head (juite flat or gently concave above from anterior 

 view; posterior femora with small tubercles below. 



Brachypalpus Macquart 

 Pile thinner and shorter, few of the hairs as long as the scutellum; 

 head not quite flat above 77 



77. Abdomen bright metallic feneous with opaque- black bands and brassy 



or golden yellow pile; posterior femora slender and with black setae 

 beneath on almost the whole length; abdomen subcylindrical (Geno- 

 type, Calliprobola crawfordi Shannon) (119, 128). 



TlChrysosomidia, n. g. 



* Curran, 1925, Kans. Univ. Sci. Bull., xv, p. 14L 



t Curran, 1924, Can. Ent., Ivi, p. 195. 



J No North American spicimcns I have seen belong to thi.s genus. 



§ Shannon, 1926, Pr. U. S. N. M.. Ixix, Art. 9, p. 12. 



il Shannon, 1916, (Calliprobola), Fr. Ent. Soc. Wash., xviii, p. 309. 



