124 Annals Entomological Society of America  |Vol. XIV, 
Tipula flavocostalis sp. n. 
General coloration of the head and thorax gray, mesonotal 
praescutum trivittate with dark brown; halteres and legs yellow; wings 
subhyaline, wing-base and costal region conspicuously light yellow; 
stigma brown; sparse gray clouds on the wing; tip of R» atrophied; 
abdomen yellow, tergites trivittate with dark brown; a subterminal 
brown ring; male hypopygium cylindrical, tilted at an angle to the 
remainder of the abdomen; ninth tergite tridentate, the median blade 
very compressed. 
Male—Length about 11 mm.; wing, 12.4 mm. Female—Length, 
13-15 mm.; wing, 13-14.5 mm. 
Frontal prolongation of the head dark brown above and beneath, 
brownish yellow laterally; palpi dark brown, terminal segment elongate. 
Antenne of moderate length; scapal segments obscure yellow, the basal 
segment darkened basally; first flagellar segment brownish yellow; 
remaining flagellar segments dark brown, covered with a dense white 
pubescence; basal enlargement of each segment relatively small; in the 
~ female, the antennz are more uniformly yellowish. Head light gray. 
Pronotum obscure gray, indistinctly trinotate with brown. Meso- 
notal praescutum light gray with three indistinct dull brownish gray 
stripes, the intermediate stripe conspicuously margined with darker 
brown and split by a capillary dark brown line to appear trilineate 
cuneiform; remainder of mesonotum light gray, the centers of the 
scutal lobes darkened. Pleura uniformly gray. Halteres pale, the 
knobs yellow. Legs with the fore coxe dark gray, the other cox 
obscure yellow, darkened basally, less extensive on the hind legs; 
trochanters and femora yellow; tibize and tarsi brownish yellow, the 
terminal tarsal segments passing into dark brown. Wings subhyaline, 
the base, costal and subcostal cells yellowish; stigma dark brown; 
vein Cu and branches seamed with dark brown; very pale gray clouds 
in the medial and anal cells; wing-tip slightly darkened, occupying the 
apices of cells Re, R3; and R;; the subhyaline band beyond the stigma 
is broad and conspicuous; veins dark brown, C, Sc and R conspicuously 
light yellow. Venation: Rs long, a little shorter than R;, about one-half 
longer than Rj,3, the extreme base indistinct; tip of R, beyond r atrophied 
in the male, in the female only the distal half of the outer section 
atrophied; cell 7st M, relatively small, pentagonal; second section of 
M42 about twice the first section; m about one-third the outer deflection 
of M314; petiole of cell My about equal to cell 1st M2; m-cu distinct. 
Abdomen dull yellow, the tergites narrowly trivittate with dark 
brown; a brown subterminal ring occupying segments six to eight, 
with the exception of the apex of the eighth sternite; hypopygium 
brownish yellow. In the female the abdomen is yellow, the tergites 
trilineate with dark brown, the fifth to seventh segments dark brown. 
Ovipositor chitinized, acicular. Male hypopygium cylindrical, tilted 
at an angle to the remainder of the abdomen, as in the wnca (hebes) 
group, to which, however, the species does not appear to belong. Ninth 
tergite extensive, the caudal margin tridentate, the lateral lobes heavily 
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