106 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



Duzee collector, July 1, 1920. 



Type locality, Forks, Clallam Co., Washington. 

 Subfamily Tipulinae 

 Tribe Tipulini 



Genus Tipula Linnaeus 



3. Tipula optiva, new species 



Antennas of male elongated; head and thorax gray, the 

 praescutum with three brown stripes; femora yellow, the tips 

 dark brown; wings grayish yellow; abdomen yellow, the tergites 

 with a conspicuous black median stripe; segments eight and 

 nine, black; male hypopygium with a conspicuous, pale, shovel- 

 shaped median lobe on the caudal margin of the eighth sternite. 



Male. — Length, 14.5 mm. ; wing, 14 mm. ; antenna about 8 mm. 



Frontal prolongation of head brownish-yellow; palpi dark 

 brown, passing into black at tip. Antennas of male elongated, 

 if bent backward, extending about to base of fourth abdominal 

 segment ; scapal segments yellow; first flagellar segment yellowish- 

 brown; remainder of flagellum black; flagellar segments elongate, 

 constricted at midlength, the apical node longer than the basal 

 enlargement. Head dull gray; two buffy spots on the occipital 

 region. 



Mesonotum buffy gray, the prsescutum with three dark brown 

 stripes, the median stripe narrowly bisected behind; scutum 

 gray, the centers of the lobes darker; scutellum light brown; 

 postnotum light gray. Pleura light gray pruinose, the dorso- 

 pleural membrane more buffy. Halteres pale brown, the knobs 

 dark brown. Legs with the coxae gray; trochanters yellow; 

 femora yellow, the tips conspicuously dark brown; tibiae dark 

 brown, passing into black at the tips; tarsi black. Wings with a 

 strong grayish yellow tinge ; wing-base and cells C and Sc more 

 yellowish; stigma oval, brown; veins dark brown. Venation: 

 Rs gently arcuated, shorter than R 3 ; cell 1st Mi elongated; m 

 parallel with the basal deflection of Mi +2 ; petiole of cell Mi about 

 equal to m; m-cu punctiform, a short distance beyond the fork 

 of M. 



Abdominal tergites yellow, segments two to seven with a 

 narrow but conspicuous black dorso-median stripe that is 

 narrowly interrupted at the posterior margin of the segments; 

 tergites eight and nine black; an indistinct brown sublateral line; 



