NO. 2344. SUPERFAMILY TIPULOIDEA— ALEXANDER AND McATEE. 431 

 Genus DICRANOTA Zetterstedt. 



KEY TO .SPECIES. 



1. Cell Ml lacking 2. 



Cell Ml present D. novehoracensis (p. 431). 



2. Halteres with the knobs darkened ; antennae of male elongated, longer than 



the thorax D. eucera (p. 431). 



Halteres pale; antennae short in both sexes D. rivularis (p. 431). 



The immature stages of the known species are spent in saturated 

 earth. 



* DICRANOTA EUCERA Osten Sacken. 



Dead Run, Virginia, April 13, 1916, McAtee; Eosslyn, Virginia, 

 March 24, F. Knab. 



* DICRANOTA NOVEBORACENSIS Alexander, 



Great Falls, Virginia, April 20, 1916 ; Dead Run, Virginia, April 

 23, 1914, April 16, 1915, R. C. Shannon. 



* DICRANOTA RIVULARIS Osten Sacken. 



Dead Run, Virginia, April 13, 1916, McAtee; Falls Church, Vir- 

 ginia, April 14, 1914, C. P. Heinrich. 



Genus RHAPHIDOLABIS Osten Sacken. 



KEY TO SPECIES. 



Inner pleural appendage of the hypopygium a long, slender, chitinized blade 

 which tapers gradually to the acute tip; ninth pleurite without a fingerlike 

 lobe on the proximal face; gonapophyses shaped like the head and beak of 

 a bird, the beak inserted just before the apex R. tenuipes (p. 431). 



Inner pleural appendage of the small hypopygium scarcely longer than the small 

 outer appendage, the apex obtusely rounded; ninth pleurite with a slender, 

 fingerlike lobe on the proximal face; gonapophyses slender, the apex dilated 

 and deeply bifid; the two lobes thus formed directed toward one another, 

 pincerlike R. persimilis (p. 431). 



The immature stages are semiaquatic. 



* RHAPHIDOLABIS PERSIMILIS Alexander. 



Difficult Run, Virginia, October 28, 1917, McAtee ; April 20, 1913, 

 C. P. Heinrich; Dead Run, Virginia, May 10, 1916, Virginia near 

 Plummers Island, September 5, 1915, McAtee. 



RHAPHIDOLABIS TENUIPES Osten Sacken. 



Dead Run, Virginia, September 27, 1914, R. C. Shannon. 



