1920] Alexander: Crane Flies From Formosa 265 



Tipula tridentata sp. n. 



Head gray; pronotum cream-colored, with a dark brown median 

 line; mesonotal praescutum obscure brownish black, sparsely pruinose; 

 wings strongly brownish yellow, the anal cells slightly paler; abdomen 

 brownish yellow, with three black longitudinal stripes; male hypopygium 

 with the ninth tergite tridentate, with an acute median tooth and more 

 blunt lateral lobes; eighth sternite with three tufts of yellowish setae. 



Male — Length 11.5 mm.; wing, 14.2 mm. 



Frontal prolongation of the head dark gray above, brownish yellow 

 beneath, these two colors divided by a narrow dark brown line; palpi 

 dark brown. Antennae moderately elongated, the long first scapal 

 segment dark brown, indistinctly reddish at the tip; second scapal 

 segment reddish brown; fiagellum dark brownish black, with a heavy 

 white pubescence; flagellar segments with the basal enlargement 

 moderately prominent, verticils conspicuous. Head light gray. 



Pronotum cream colored with a delicate, dark brown, median line. 

 Mesonotal praescutum obscure brownish black, sparsely pruinose, with- 

 out distinct stripes, the margins of the sclerite more brownish; scutal 

 lobes black, sparsely pruinose; scutellum reddish brown, the median 

 sclerite with a delicate, dark brown, median line; postnotiun gray, 

 whitish gray pruinose. Pleura pale brown, sparsely gray pruinose. 

 Halteres rather long, light yellow, the knobs brown. Legs with the 

 coxae light yellow, with a faint gray bloom ; trochanters dull yellow ; fore 

 femora brown, more yellowish basally; posterior femora brownish 

 yellow, with a narrow, dark brown ring before the tip; tibise brown, the 

 tips dark brown; tarsi dark brown. Wings with a strong, brownish 

 yellow tinge that is slightly paler in the anal cells; stigma slightly 

 darker brown; a small obliterative area before the stigma in cell 1st Ri 

 and another extending from the end of cell R across cell 1st Mo into 

 the base of cell if 4 ; veins dark brown ; three or four macrotrichiae in cell 

 R-o near its distal end. Venation: Rs about twice the length of R2+3] 

 basal section of R2 nearly perpendicular to the end of i?2+3; cell 1st M2 

 small-, pentagonal; petiole of cell Mi about one-half the length of the 

 cell; m-cu present. 



Abdomen brownish yellow, the tergites with three conspicuous 

 black longitudinal stripes; stemites and hypopygium pale brownish 

 yellow. Male hypopygium with the ninth tergite extensive, the caudal 

 margin produced into two, bluntly rounded, lateral lobes and an acute 

 median tooth that is carinate on its ventral surface; margins of all three 

 lobes heavily blackened. Ninth pleurite complete; outer pleural 

 appendage slender, elongate, slightly flattened, broadest at about mid- 

 length, the distal two-thirds provided with long, coarse, black setae; 

 inner pleural appendage complex, the posterior margin at the base 

 produced into a cylindrical lobe that tapers to the subacute apex and is 

 clothed with long setae. Ninth sternite with a comparatively shallow 

 notch, from between which project the small, curved, black apophyses. 

 Eighth sternite rather projecting, the caudal margin trilobed, a rounded 

 median lobe that bears a flattened fringe of yellow hairs and two nearly 



