NO. 2344. SUPERFAMILY TIPULOIDEA— ALEXANDER AND McATEE. 407 

 TIPULA TEPHROCEPHALA Loew. 



Mount Vernon, Virginia, June 9, 1918, McAtee. 



TIPULA TRICOLOR Fabricins. 



Frequent; season from July 20 to September 6. P. I. 



• TIPULA TRITON Alexander, 



District of Columbia, Osten Sacken. 



TIPULA TRIVITTATA Say. 



Jacksons Island, May 22, 1913, at trap light, R. C. Shannon and 

 H. S. Barber; Plummers Island, May 31, 1908, June 23, 1907, Mc- 

 Atee; Washington, District of Columbia, June 6, 1913, K. C. Shan- 

 non ; Beltsville, Maryland, May 28, 1916, McAtee. 



* TIPULA TUSCARORA Alexander. 



Glencaryln, Virginia, June 21, F. Knab; Washington, District of 

 Columbia, no date. 



TIPULA ULTIMA Alexander, 



Common in autunm, September 5 to October 30, emerging in num- 

 bers on latter date, however, and frequent in copula ; comes to light, 

 V. P. I. 



TIPULA UMBROSA Loew, 



Frequent, May 18 to July 13. 



Tribe LIMNOBIINI. 



KEY TO GENERA. 



1. Rostrum elongated, longer than the head and thorax taken together 



Oeranomyia (p. 408.) 

 Rostrum not elongated, shorter than the head 2. 



2. A supernumerary crossvein in cell first A, connecting the two anal veins 



Discobola (p. 408). 

 No supernumerary crossvein in cell first A 3. 



3. Often with a supernumerary crossvein in cell Sc; antennae of the male bi- 



uni- or sub-pectinate RJiipidia (p. 409). 



No supernumerary crossvein in cell Sc (excepting a weak one in Dicranomyia 

 simulans) ; antennae of the male not pectinate 4. 



4. vS'c usually short, ending opposite the origin of Rs; claws with u.sually but a 



single tooth on the lower side; ventral pleural appendage of the male 



hypopygium a fleshy lobe Dicranomyia (p. 410). 



Sc always elongate, ending far beyond the origin of the sector; r often con 

 siderably removed from the tip of R ; claws with usually two or three teeth 

 on the lower side; ventral pleural appendage of the male hypopygium 

 horny LimnoMa (p. 412) . 



