SYRPHIDJ3.. 259 



76. Scutellum, margin of thorax and pleurae with distinct bristles, 



femora slender (Chrysochlamys) (25). . Ferdinandea. 

 No bristles anywhere on body. ...... 77 



77. Face short, not produced, concave from antennae to oral margin, 



not tuberculate; hind femora thickened. .... 78 

 Face produced, long. ........ 79 



7S. Abdomen elongate. Brachypalpus. 



Abdomen very broad ; thorax densely pilose ; middle femora of 

 male sometimes {Hadromyia) with a stout, basal, inferior spur. 



Pocota. 



79. Face produced forward, pointed, concave from antennae to tip, not 



tuberculate; hind femora thickened. . . Crioprora.* 



Face not evenly concave in profile, but tuberculate or convex. 80 



80. Third joint of antennae produced above into an anteriorly directed, 



conical process, terminating in the thickened arista. 



Merapioidus. 

 Third joint of antennae obliquely oval; hind femora rarely thick- 

 ened Criorhina. 



81. Hind femora with a conical, tooth-like protuberance below near 



distal end; antennae more or less elongated; sixth vein directed 



obliquely outward beyond anal cell (21, 22) . Spilomyia. 



Hind femora without much protuberance; sixth vein beyond anal 



cell not unusual. ........ 82 



82. Antennae inserted low down, near middle of head in profile, the 



face not longer than front. .... Temnostoma. 

 Antennae inserted on a conical process; front short, the face 

 much produced downward; antennae long or short. 



Sphecomyia. 



AUXILIARY TABLE. 



1. Marginal cell of wings closed: 



Copestylum, 4, 5, 8. Meromacrus, 2. 



Eristalis 2, (5), 8. Milesia, 2, 7. 

 Lycastrirhyncha, 2, 6. (Priomerus), 2, 8. 



Megametapon 4, 5, 8, 10. Voluceila, 4, 5. 8. 



2. Third longitudinal vein markedly curved into first posterior cell. 

 Asemosyrphus, 10. Arctophila, sp. 5, (fig. 15). 

 Ceriogaster, 9. Platynochaetus, 13. 

 Chrysotoxum, 4, 8. (Priomerus), 1, 8. 

 Condidea, 5. Pterallastes, 4. 



Didea, 8, (fig. 17). Salpingogaster, 9, (fig. 11). 



Eristalis, 1. 5,8; (fig. 17). Syrphus, sp. 



Helophilus, 10, (fig. 18). Teuchocnemis. 



Lycastrirhyncha, 1, 6. Tropidia, 7. 



Mallota, 8, 10. Milesia, 1, 7. 

 Meromacrus, 1. 



* C. arctophiloides is a Criorhina, 



