10 Annals Entomological Society of America [Vol. XIV, 
rectangular. Lower apical appendages not prolonged, broad, curved 
outwardly, the inner angle extended, acute. Vein Cu and its branches: 
seamed with fuscous. 
Male.—Length 17 mm.; wing 19 mm. 
Head yellow; rostrum beset with rather long, black hairs. Palpi 
yellowish-fuscous, darker outwardly. Antennz moderately long, 
scapal joints yellow, first flagellar joint yellowish-fuscous, remainder 
fuscous, segments elongate cylindroidal. Vertex dark, sordid yellow 
with strongly marked impressed, dark fuscous line. 
Thorax dark yellow. Anterior margin of the pronotal scutum and 
a stripe each side grayish-white, within this stripe is narrowly edged 
with fuscous, while externally to it is a wider, pale fuscous stripe;. 
pronotal scutel pale yellow above, pale fuscous laterally. Prascutal 
lines not sharply defined, the inner lines sinuous, wider in middle 
third. Markings of scutum indistinct. Scutel and postnotum grayish- 
yellow with indistinct median line, the postnotum edged with pale, 
laterally. Pleura concolorous with a grayish bloom, pleuro-dorsal 
membrane paler. Legs yellow, pilosity short, blackish, appressed; 
coxee paler; femora and tibiz infuscate at the apex, the latter longer 
than the metatarsi; tarsi-yellowish fuscous. Wings grayish, darker in 
apical portion; cell C concolorous, cell S. c. yellow; stigma brown, 
antestigmal spot conspicuous, extends broadly through the outer end 
of cell R, basal half of cell 1st M? into basal third of cell M*; post 
stigmal spot obsolete. Veins brown, Cu and its branches broadly 
seamed with fuscous; cell lst M? about twice as long as its greatest 
width, pentagonal. 
Abdomen brownish-yellow; a fuscous dorsal stripe on tergites one 
to four; a lateral stripe interrupted before the posterior margin of the- 
segments, posterior and lateral margins, pale gray. Venter dusky- 
yellow. Eight sternite slightly emarginate each side of middle, the: 
inner end of the emarginations edged with fuscous, a brush of yellowish-. 
gray bristles, longer than the sternite, pale at the base, the inner bristles: 
decussating. Hypopygium (Pl. I, Fig. 4) yellowish-brown; the ninth 
tergite short with a deep, U-shaped emargination, its canthi approx- 
imately rectangular, lobes feebly emarginate, sides strongly incurved 
and ending in an acute spine;. the subtergal process broad. Viewed 
laterally, its lower edge nearly straight, obtusely pointed; the, evo- 
luted portion of the inner apical appendages inconspicuous; the lower 
apical appendages broad, curved outwardly, the inner part prolonged 
and pointed, yellow-haired within. Ninth tergite broadly and deeply 
emarginate with a narrow, pale, membranous appendage from the 
edge of the emargination. Pleurites emarginate above, angles of the 
emargination acutely pointed. 
Holotype—o’, South Park, Colorado, June 23, 1916. 
Paratype—o’, Clear Creek, Colorado, -June.11, 1916, 
CHa) Osiar): 
