1915.] NATURAL SCIENCES OF PHIIiADELPIHA. 507 
Tipula morrisoni sp. n. 
Coloration yellowish; antennte indistinctly bicolorous; thorax 
with the stripes rath(u- indistinct; male genitalia enlarged, the 
ninth tergite very high and tumid, with a deep V-shaped notch; 
ventro-caudal margin of the segment with two chitinized, denticulate 
lobes; gonapophyscs powerful; eighth sternite with a dense brush 
of long pale hairs. 
Male. — Length, 13-14 mm.; wing, 18-18.5 mm. 
Female. — ^Wing, 15 mm. 
Frontal prolongation of the head moderately long, dull yellow; 
palpi light brown. Antennae rather short, if bent backward extend- 
ing about to or slightly before the base of the wings; the basal seg- 
ments brownish yellow, the flagellum indistinctly bicolorous, the 
bases of the segments being dark brown, the remainder yellowish 
brown; the flagellar segments are only a very little constricted beyond 
the base. Head pale grayish brown with a narrow brown median 
line, more distinct behind. 
Thoracic dorsum dull light yellow or brownish yellow, the prsescutal 
median stripe very broad but relatively indistinct, brownish; scutum 
with the lobes a little darker than the pale median area; thorax 
rather densely provided with pale hairs. Pleura whitish pollinose, 
umnarked. Halteres rather pale, the knob a little darker. Legs 
with the coxae whitish pollinose; trochanters yellowish; remainder 
of the legs light brown, the apices of the segments scarcely darker. 
Wings subhyaline, the costal cell brown, the stigmal spot rather 
extensive, brown; an extensive vitreous band before the stigma in 
cell 1st Ri, extending beyond cell 1st Mo. Venation as in Plate XVII, 
fig. 21. 
Abdominal tergites dull yellow; a brown median vitta which is 
barely indicated on segment one, extencUng the entire length of 
segment two, on segments three and four broadening out to include 
most of the dorsum; segments five to eight with the median mark 
again narrowed; segments margined with silvery, this mark broad 
laterally, very narrow caudally; the sternites pale. Male genitalia 
(see Pljate XVIII, fig. 41) with the eighth tergite very narrow. 
Ninth tergite exceedingly tumid, very high, the caudal margin with 
a deep V-shaped notch, the lateral lobes thus formed directed caudad 
and slightly dorsad; the segment is dark brown, the margin pale 
whitish, the browTi continuing up to the apices of the lobes and as a 
narrow line to the ventro-caudal margin of the segment on the caudal 
face; a narrow brown line running obliquely from underneath the 
