932 Charles Paul Alexander 



which showed well the dimorphic nature of the flies of this group. Some 

 of the specimens of each sex were entirely black, while others were reddish 

 yellow with the wings tipped with darker. Specimens having hyaline 

 wings are often taken. 



The larvae live in decaying wood. The adult flies are easily distinguished 

 by the double bipectinate antennae of the male (fig. 125, m, page 850), and 

 the serrate antennae and relatively short ovipositor in the female. 



The local species of the genus may be separated by the following key: 



Wings with the entire apex beyond the cord tinged with blackish: thorax yellowish brown 

 with darker spots. [Proc. Ent. Soc. Phila., vol. .3, p. 45-46. 1864.] (Plate XLIII, 189, 

 normal form; 190, black form, the wing not shaded in this drawing.) C. apicata 0. S. 



Wings nearly hyaline, with a large brown cloud between the cord and the wing tip but 

 not reaching the apex; thorax yellow with a wedge-shaped median brown stripe. [Proc. 

 Ent. Soc. Phila., vol. 3, p. 46. 1864.] C. nubecula 0. S. 



Tribe Tipulini 

 The genera of the tribe Tipulini may be separated in accordance with 

 the following key: 



1. Flagellar segments of antennae not verticillate Stygeropis Loew (p. 932) 



Flagellar segments of antennae verticillate 2 



2. Abdomen greatly elongated in both sexes, much longer than the wing alone; the male 



hypopygium simple in structure, the ninth sternite very long with the pieurites lying 



in this concavity 3 



Abdomen not greatly elongated in the male sex, rarely so in the female sex {Tipula 

 longiven(ris), not longer than the wing; the male hypopygium more complicated in 

 structure, if simple the ninth sternite not shaped as described above 4 



3. Cell Ml ses.sile; wings strongly suffused with reddish brown. . . Aeshnasonia Johns, (p. 933) 

 Cell Ml petiolate, long-petiolate in Longurio minimus, short-petiolate in L. tefttaceus; 



wings grayish, the subcostal cell brown Longurio Loew (p. 933) 



4. Rs usually very short, almost transverse, simulating a cross- vein; cell Mi sessile or short- 



petiolate; basal deflection of Cui or the m-cu cross-vein joining M at or before its fork; 



coloration usually yellow and black, shiny 5 



Rs usually longer, not simulating a cross-vein; cell Mi always petiolate; basal deflection 

 of Cui or the m-cu cross-vein joining M at its fork or underneath the middle of cell 

 Isl Mr, coloration usually dull brown, yellow, or gray. (Genus Tipula Linn.) 6 



5. Cells of wings glabrous Nephrotoma Meig. (p. 934) 



Apical cells of wings pubescent Subgenus Odonlotipula Alex. (p. 943) 



6. Cells of wings glabrous Subgenus Tipula Linn. (p. 942) 



Apical cells of wings pubescent 7 



7. Apical cells of wings with an abundant short pubescence; body coloration dull brown, 



as in species of Oropeza Subgenus Trichotipnla Alex. (p. 942) 



Apical cells of wings with a sparse short pubescence; thoracic dorsum dark-colored with 

 paler stripes Subgenus Cindotipula Alex. (p. 943) 



Genus Stygeropis Loew 



1844 Prionocera Loew. Stett. Ent. Ztg., vol. o, p. 170; preoccupied. 

 1863 Stygeropis Loew. Berl. Ent. Ztschr., vol. 7, p. 298. 



