1942 ] 
New Species of Syrphidse 
21 
wide, occupying perhaps more than half of the segment and 
reaching the sides somewhat posteriorly on less than half 
of the width. Fourth segment light orange with a black tri- 
angle in each anterior corner and an oval laterally pointed, 
widely separated, black fascia-like spot on the posterior 
margin. Fifth segment with a large, oval, basal, median 
spot and a pair of subapical submarginal, small, transverse 
spots, black. Legs: entirely pale yellow, the posterior tarsi 
a little darker. Wings : hyaline, stigma pale yellow. 
Holotype: one female, Black Foot, Idaho, June 17, 1933 
(Louise Ireland). In the collection of author, received 
through the kindness of Dr. James. 
Volucella spectralis n. sp. 
Related tricincta Bigot through the flattened scutellum, 
but very different. The apical third of the wing is brown, 
most of the costal cell and the basal part of stigmal cell 
yellow. 
Female. Length 5 mm. Head : dark brown, the vertex 
considerably protuberant with black pile at the top, a raised 
protuberance in the middle of the lower part of the front 
with a flattened area on either side. The face is flattened on 
either side of the rounded tubercle, with a small white 
pubescent rounded spot on each eye margin and a larger 
one just beneath the antennae. The cheeks are brown; a 
yellowish-brown stripe in front. The antennae are rather 
short, light brown, the third joint somewhat pointed on the 
apical half, the pale arista with seventeen rays. Thorax: 
mesonotum brassy black, the humeri and post calli and the 
pleurae brown. Mesonotal pile black in the middle, pale else- 
where, with a row of seven long prescutellar black bristles 
besides other black ones on margins and pleura. Scutellum 
translucent, brownish-yellow, quite large and inflated, flat- 
tened on either side and this flattened area microrugose, 
margined with three pairs of slender, black bristles; the 
dorsum has both pale and black pile. Abdomen: shining, 
mahogany-brown, the first segment and two large, narrowly 
separated spots on the base of the second segment are yel- 
lowish. The median vittae of the second segment continues 
to bisect the first segment. Legs: femora and tibiae dark 
