28 Mr. C. H. T. Townsend on Diptera 
on apical third to about half its basal width. Arista longer 
than antenne, thickly plumose. Face brownish yellow, 
silvery pollinose on sides, black-hairy on region of tubercle, 
with some white hairs on sides. Front shining greenish 
black, with yellowish hair except some black at vertex, 
yellowish pollinose on each side in front, with a black patch 
next antenne in middle. Thorax dark bluish or greenish, 
with coppery or violet reflections and more or less of a milky 
tone over all, this tone sometimes wanting, leaving the disk 
shining dark green ; clothed with quite thick, short, yellow, 
anteriorly-directed pubescence ; a pair of median vitte, more 
distinct in front, formed by longer finer pubescence directed 
backward. Pleurz with yellow hairs. Six strong bristles on 
scutellum, apical pair rather distant, also a smaller bristle on 
each side near anterior corners. In some specimens there are 
four nearly equal bristles on each side beside the weaker one. 
Scutellum clothed with yellow hair, with some rather incon- 
spicuous black hairs on posterior half of dorsum. 
30. Volucella rafaelana, sp. n. 
One female, San Rafael, July 1. On flowers of the Cordia 
sp: 
Length 11 millim. 
Differs from V. cordie as follows :—Scutellum without 
yellow, wholly opalescent-cupreous with a faint bluish-milky 
tinge like that of thorax. Scutellum with black hair on disk, 
yellow hair confined to the edges. ‘Third abdominal segment 
laterally pale yellow on anterior margin. Wings nearly 
hyaline basally instead of yellow, and less fuscous on internal 
border, with the first and second posterior cells largely 
hyaline. 
This is at least a good variety of cordie, if not distinct as 
a species. 
31. Volucella nautlana, sp. n. 
Six males, San Rafael, June 28 to July 7. All on flowers 
of the Cordia sp. 
Length 10 to 11 millim. 
Differs from V. cordie as follows :—Antenne somewhat 
shorter, third joint proportionately not so much narrowed. 
Frontal triangle black, shining anteriorly in middle, a little 
yellow-pollinose on sides, with thick black hair. Thorax 
with the longer posteriorly-directed hairs black, thickly 
clothing whole dorsum, seen above the shorter anteriorly- 
directed thick golden-yellow vestiture. Scutellum not so 
clear brownish yellow, more of a flesh tinge, with a slightly 
EE 
