16 PKOCEEDINGS OP THE NATIONAL MUSEUM vol.72 



Habitat. — Oregon. Holotype^ female, Marshfield, June 27 (J. M. 

 Aldrich). 



^2/^6.— Female, Cat. No. 40329, U.S.N.M. 



Ulomorpha aridela is the second species of the genus to be dis- 

 covered having cell M^ present. It is readily told from U. quinque- 

 cellula Alexander by the large size and coloration of the mesonotum. 



TRICYPHONA STENOPTERA, new species 



Antennae 15-segmented ; legs long and slender; v^ings reduced to 

 long ribbonlike strips. 



Male. — ^Length about 6 mm.; wing, 3.2 mm., its greatest vridth, 

 0.2 mm. 



Rostrum obscure yellow, the palpi darker. Antennae brownish 

 black throughout, 15 segmented, the second scapal segment large, 

 as long as or longer than the first flagellar segment; flagellar seg- 

 ments beyond the first decreasing in length and diameter outwardly, 

 passing into short oval and then subglobular. Head light gray. 

 Eyes densely hairy. 



Pronotum buffy, a little infuscated medially. Mesonotum uni- 

 formly pale buffy yellow, without distinct markings. Pleura yel- 

 low, the anepisternum and sternopleurite a little more grayish. 

 Halteres pale yellow, the knobs infuscated. Legs unusually long 

 and slender for such extreme stenoptery (fore leg, femur, 5 mm.; 

 tibia, 5.4 mm.; tarsus, 7.9 mm.); coxae long and slender, obscure 

 yellow, sparsely pruinose; femora obscure yellow, the tips vaguely 

 darkened; tibiae light brown, the tips narrowly dark brown; tarsi 

 dark brown. Wings reduced to long, ribbonlike strips, strongly 

 tinged with brownish yellow, clearer yellow basally; veins pale, the 

 macrotrichiae very well preserved. Although the wing is so de- 

 generate, the venation of the radial field is well preserved and shows 

 Rs arising at shortly beyond two-thirds the wing length, pale, with- 

 out macrotrichiae; upper fork of the sector, ^2+3+4? bears two long 

 branches, both with conspicuous macrotrichiae for almost their 

 entire length ; the basal section of R^ is not preserved, there being no 

 connection between R^ and the branches of the sector; ^5 with 

 macrotrichiae for its entire length. 



Abdominal tergites light yellowish brown with a vague darker 

 brown dorso-median vitta ; sternites more uniformly colored, reddish 

 brown, darker outwardly, the caudal margins of the segments nar- 

 rowly obscure yellow; subterminal segments uniformly darkened; 

 hypopygium obscure yellow. Male hypopygium (fig. 8) with the 

 tergite {t) greatly produced medially into a conspicuous base that 

 divides further into two divergent setiferous arms, the setae on the 

 surface erect, on the ventral surface more spinous and recurved. 



