34 Everett E. Wehr 



Cnemodon Egger 

 KEY TO THE SPECIES 



1. Wings purely hyaline, last section of fourth vein sinuous.. ..sinMosa 



Wings cinereous or brownish hyaline, last section of fifth vein 

 bent at its middle; third antennal joint black above; male with 

 middle and hind coxae with processes calcarata 



Cnemodon sinuosa Curran. Proc. Cal. Acad. Sci., xi. No. 16, p. 368 



(1921). 



A 5 from Glen, Sioux County, 9,000 feet, August 18, 1906 

 (P. R. Jones). This specimen agrees pretty closely with 

 sinuosa but has been given that name tentatively only, because 

 males are necessary for the certain determination of it. 



Cnemodon calcarata (Loew). Cent., vi, 42 (1865). 



1886. Pipiza calcarata Williston, Synop. N. A. Syrph., 24. 



One $ from Lincoln, Lancaster County, in April. 



Pipiza Fallen 



Pipiza femoralis Loew. Cent., vi, 38 (1865) ; Williston, Synop. N. A. 

 Syrph., 26 (1886). 



Two $ $ and three ? ? from Roca and Lincoln, both in 

 Lancaster County, May and June. 



Pipizella Rondani 



Pipizella pulchella (Williston). Synop. N. A. Syrph., 29 (1886); Cur- 

 ran, Proc. Cal. Acad. Sci., xi, No. 16, p. 349 (1921). 



A $ from Glen, Sioux County, August 20, 1906 (H. S. 

 Smith) . The third joint of the antenna is not as long as that 

 of specimens from Colorado, but the last section of the fourth 

 vein is bent near its middle. 



Heringia Rondani 



Heringia salax (Loew). Cent., vi, No. 39 (1865). 



1886. Pipiza pistica Williston, Synop. N. A. Syrph., 29. 



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