Identification Keys 207 



ig. Front feet wholly black. (Male.) 



Megarhinus scptcntrionalis, Dy?r and Knab. 

 Front feet with a white band on each. 



Both sexes of McgarJiimis rutilus, Coquillett, 

 and female of McgarJiimis septentrionalis, Dyar 

 and Knab. 



20. Legs with fuzzy appearance, caused by nearly 



erect scales PsoropJiora ciliata, Fabricius. 



Legs not fuzzy in appearance, scales nearly fiat 2 1 



21. Front and middle tarsi unicolorous 22 



Front or middle tarsi distinctly bicolorous. . .26 



22. Terminal joint of hind tarsi and apex of preced- 



ing joint black 23 



Terminal joint of hind tarsi and preceding joint 

 wholly white 24 



23. Scales on upper side of thorax yellow. 



JantJiinosoma varipes, Coquillett. 



Scales yellow and with a median stripe of black. 



JantJiinosoma discrncians, Walker. 



24. With metallic blue scales at side of thorax, base 



of wings and head. 



Uranotcenia lowii, Theobald. 

 Without such blue scales 25 



25. Stripe of black scales down middle of thorax. 



JantJiinosoma lutzii, Theobald. 

 Stripe absent, scales of thorax wholly yellow. 



JantJiinosoma posticata, Wiedemann. 



26. Lyre-shaped white mark on thorax. Last hind 



tarsal joint wholly white. 



Stcgomyia calopus, Meigen. 

 Lyre-shaped white mark absent 27 



27. Wings with distinct black spots. Femora ringed 



with white beyond the middle. 



TJicobaldia annulata, Schrank. 

 Wings unspotted. No rings on femora 28 



