370 NEW YORK STATE MUSEUM 
widened below into a crossbar, a prong invading the orbital 
area on each side; silvery pubescent on occipital margin; pro- 
boscis black, brownish at the tip, palpi black; antennae cinere- 
ous, with short silvery pubescence, the two basal joints longer — 
than the following joints, which are nearly equal in length; 
occiput cinereous with silvery pubescence around the margin. 
Thorax cinereous, mesoscutum entirely covered with silvery 
pubescence, with two dorsal lines and usually a fainter median 
line between them; pleurae fulvous posteriorly, scutellum black, 
silvery pubescent. Abdomen light fulvous sparsely covered 
with short silver pubescence. Second, third and fourth seg- 
ments above with a brown cross band shading to darker on the 
sides and in the middle, particularly on the third and fourth 
segments, remaining segments with a broad, median,~ dorsal, 
cinereous band, bounded laterally on fifth, sixth and seventh 
segments by a curved more or less faint line of brown; venter 
light fulvous, silvery pubescent. Legs black, silvery pubescent. 
Wings hyaline, iridescent by reflected lights; halteres white. 
Length of body 2mm; of the wings 2mm. 
Described from many fresh specimens. This species is smaller 
than either 8S. pecuarum, or S& meridiona.e. 
metallicum Bell. from Mexico is given as 2mm long, but the 
male is described. The female would be much larger. , 
I have examined specimens from New Mexico, kindly sent me 
by Professor Aldrich of Idaho, to whom the specimens were 
sent by Mr Townsend, and named occidentale. The 
only difference I have been able to discover between this and 
meridionale is its smaller average size. The tarsal 
claws are as in meridionale. The abdominal markings 
were too indistinct, owing to shrinkage, to allow of comparison. 
For the present I regard it as a small variety of meridio- 
nale. 
S. ochraceum Walker 
Ent. Soe. Lond. Trans. 5:332 
Female. Testaceous, with white tomentum; head white; 
antennae testaceous; thorax ochraceous, with two white stripes; 
abdomen blackish, testaceous at the base; femora and tibiae 
with black tips; tarsi black, testaceous toward the base; wings 
vitreous; veins pale testaceous. Length of body 2mm; of wings 
4s;mm. Mexico. 
This species can hardly be the female of S. metallicum 
sellardi. 
