1915.] NATURAL SCIENCES OF PHILADELPHIA. 507 



Tipula morrisoni sp. n. 



Coloration yellowish; antennae indistinctly bicoloroiis; thorax 

 with the stripes rather 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; gonapophyses 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 praescutal 

 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, 

 unmarked. 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 M2. Venation as in Plate XVII, 

 fig. 21. 



Abdominal tergites dull yellow; a brown median vitta which is 

 barely indicated on segment one, extending 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 Plate 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 brown 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 fine running obliquely from underneath the 



