Vol. X] ALEXANDER— UNDESCRIBED TIPULIDX 45 



submedian lobes rounded ; the dorsal surface of the tergite has a median, 

 impressed line that continues cephalad, before the base cutting off a sub- 

 triangular area. Ninth pleurite small but complete; outer pleural ap- 

 pendage small, cylindrical or slightly clavate, pale, provided with long 

 hairs; from the ventral proximal angle of the pleurite projects ventrad a 

 short, blunt lobe that is provided with abundant crinite hairs that hang 

 ventrad across the genital chamber. Eighth sternite with two brushes of 

 rather short golden-yellow hairs on the posterior margin, contiguous, or 

 even slightly decussate across the median line. Gonapophyses appearing 

 as two long chitinized rods that lie parallel and close together, directed 

 dorsad. 



Habitat. — California. 



Holotype, $ (No. 728), Huntington Lake, Fresno Co., alti- 

 tude 7000 feet, July 23, 1919 (E. P. Van Duzee). 



Tipiila cvidens is allied to T. megalahiata Alexander but dif- 

 fers in the coloration of the antennae and in the structure of 

 the male hypopygium. This species, together with most of the 

 other species of the genus discussed in this paper, were sub- 

 mitted to Mr. Cole for comparison with the Doane types and he 

 reports this as very distinct from any of Doane's species in the 

 Stanford University Collection. I am greatly indebted to Mr. 

 Cole for his care and help in determining these relationships. 



10. Tipula megatergata, new species 



General coloration yellow ; antennal flagellum black ; meso- 

 notal praescutum pale buffy yellow witTi three indistinct reddish 

 brown stripes ; wings light gray, the costal region more yel- 

 lowish ; abdomen obscure yellow ; male hypopygium very large 

 and powerful, the ninth tergite tumid, with the lateral angles 

 produced caudad into elongate, pointed lobes that are bent 

 slightly dorsad at their tips ; ninth sternopleurite very restricted. 



Male. — Length about 18 mm.; wing, 16.5 mm. 



Frontal prolongation of the head yellow, the nasus small ; palpi obscure 

 brownish yellow, the last segment dark brown. Antennse with the scape 

 yellow, the first flagellar segment light brown; remainder of the flagellum 

 black. Head reddish yellow, sparsely gray pruinose, with an indistinct, 

 median, capillary brown line. 



Mesonotal prsescutum pale buffy yellow with three indistinct reddish 

 brown stripes, the broad median stripe split by a broad grayish line; 

 remainder of the mesonotum yellowish. Pleura yellow, sparsely yel- 

 low pollinose. Halteres pale yellow, the knobs brown. Legs with the 

 coxae and trochanters yellow; remainder of the legs broken. Wings light 

 gray, cells C and Sc yellowish ; stigma pale brown ; a conspicuous obliter- 

 ative streak extending from before the stigma across the wing into the 

 base of cell Mt. Venation : Cell 1st Mj pentagonal, high ; basal deflection 

 of A/i+2 longer than Nh+i. 



