216 Journal New York Entomological Society. [Vol. xxii. 



Characters of the Genus. 



Frontal prolongation of the head rather long, the nasus prominent, 

 with a bunch of long hairs at the tip. Terminal segment of the 

 palpus elongate, whiplash-like. Antennze rather long, at least as long 

 as the head, the scapal segments enlarged, the flagellar segments 

 six in number, elongate-cylindrical; in the New World species the 

 antenna are about as long as the head, in the males of the Old World 

 forms (this sex of M. bicauda Speiser of Africa not yet described) 

 the antenna: are enormouslj' elongated. Eyes with delicate omma- 

 tidia ; the vertex rather approximated between the eyes. 



Pronotum not produced dorsad into a narrow plate as in Taiiy- 

 prcmna. Mesonotal prsescutum not exceedingly gibbous or projecting 

 over the head. Halteres rather long, the knob small. Legs very long 

 and slender, especiallj- the tarsi. Wings with the cross-vein m-cu 

 present and long; basal deflection of i?.^, assuming a position that is 

 nearly vertical or perpendicular. The Old World fuscana Wiede- 

 mann has a venation that is quite similar to that of our American 

 form except that the cell ist .1/, is much smaller and cell 3nd A very 

 much broader. 



Abdomen rather short, the male hypopygium simple ; the valves 

 of the ovipositor powerful, the lower valve arcuated basally, the lower 

 valves appressed against the upper pair. 



Megistocera longipennis Macquart. 



1838. Tipula longipennis Macquart ; Dipt. Exot., vol. i, pt. i, p. 57, pi. 

 5, fig- I. 



1878. JLongurio longipennis Osten Sacken; Cat. Dipt. X. Am., Ed. 

 2, p. 37- 



1885. Tipula longipennis Roder; Stett. Ent. Zeit., vol. 46, p. 338. 



1885. Tipula tenuis v. d. Wulp ; Notes Leyden Museum, vol. 7, p. 7. 



1885. Tipula tenuis v. d. AVulp ; Tijdschr. voor Entom., vol. — , p. 85, 

 pi. 4, fig- — . 



1886. Megistocera longipennis Osten Sacken ; Berl. Ent. Zeit., vol. 30, 

 p. 161. 



1902. Megistocera longipennis Kertesz ; Cat. Dipt., vol. 2, p. 264. 

 1902. Tipula tenuis Kertesz ; I. c, p. 309. 



1907. fMegistocera tenuis Needham ; Rept. Soc. Ent. N. Y., p. 212. 

 1909. Megistocera longipennis Johnson ; Proc. Bost. Soc. N'at. Hist., vol. 

 34, p. 12.1- 

 Male, length, 10 mm.; wing, 15.6 mm. 



Middle leg, femur, 11.2 mm.; tibia, 10.6 mm.; metatarsus about 

 26 mm. 



