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 O.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. 
Bntasocuehila:, voliiaisp 46s SS G4s |e oes ees ee clean ee C. nubecula O. 8. 
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) 
Hlagellar segments/of antennae verticillate;.4.5 52.) 22-424 ae | ee eee 
2: Abdomen greatly elongated in both sexes, much longer than the wing alone; the ane 
hypopygium simple in structure, the ninth sternite very long with the pieurites lying 
Invthis concavity: ws Ne Te TS a ENE ANN SER SRD Rr ra 3 
Abdomen not greatly elongated in the male sex, rarely so in the female sex (Tipula 
longiventris}, 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 M, sessile; wings strongly suffused with reddish brown... Aeshnasoma Johns. (p. 933) 
Cell M, petiolate, long-petiolate in Longurio minimus, short-petiolate in L. testaceus; 
wings grayish, the subcostal cell brown...................... Longurio Loew (p. 933) 
4, Rs usually very short, almost transverse, simulating a cross-vein; cell M, sessile or short- 
petiolate; basal deflection of Cu: or the m-cu cross-vein joining M at or before its fork; 
coloration usually, yellow and'blacksishimya jm). 55 ila) ses ae 5 
Rs usually longer, not simulating a cross-vein; cell M, always petiolate; basal deflection 
of Cu. or the m-cu ecross-vein joining M at its fork or underneath the middle of cell 
1st M2; coloration usually dull brown, yellow, or gray. (Genus Tipula Linn.)....... 6 
Hu Cellisvotawings:clabrouse ae ear tienie i ane ie eae Nephrotoma Meig. (p. 934) 
Apical cells of wings pubescent.................-. Subgenus Odontotipula Alex. (p. 943) 
GiCells of wings glabrous ian eer ae) rena 2 a tear Subgenus Tipula Linn. (p. fe 
Apical cells of wings pubescent. SiG ok Pee eA. OR es Oe ee ce 
7. Apical cells of wings with an abundant short pubescence; body coloration dull Bron’ 
as in species of Oropeza NU es arm ett pec cn xs pelea Subgenus Trichotipula Alex. (p. 942) 
Apical cells of wings with a sparse short pubescence; thoracic dorsum dark-colored with 
PALEPASLLTP ES). Wale Ren. cts rebaea ns Gee eat Rao terre Subgenus Cinctotipula, Alex. (p. 948) 
Genus Stygeropis Loew 
1844 Prionocera Loew. Stett. Ent. Ztg., vol. 5, p. 170; preoccupied. 
1863 Stygeropis Loew. Berl, Ent. Ztschr., vol. 7, p. 298 
