30 Mr. C. H. T. Townsend on Déptera 
This character must be taken as indicating varietal rank, 
since the hair of front in the other female is wholly black 
like that of the males. 
33. Volucella viridana, sp. n. 
One male, San Rafael, July 7. On flowers of the Cordia sp. 
Length 93 millim. 
Front, face, thorax, scutellum, pleure, and base of 
abdomen brilliant shining green, with slight cupreous 
reflections on the thorax. Antenne brownish yellow, 
reaching about two thirds way to summit of tubercle, third 
joint scarcely wider at base. Face strongly concave above 
tubercle, and strongly produced downward below. Cheeks 
with a black stripe, behind which is a triangular yellowish 
area. No facial stripe, thin pubescence of face whitish. 
Frontal triangle with whitish hairs, mixed with dark ones 
behind. Thorax without prescutellar row of bristles, with 
the golden vestiture and longer blackish hairs as described 
for nautlana, but the black hairs not so conspicuous behind. 
Scutellum clothed with yellow hairs, with ten weak bristles 
on border, the apical pair more approximated than in the 
preceding four species. Abdomen shining cupreous violaceous 
brown, blended in with the bright green ou second segment, 
so that latter appears mostly bright green from before and 
wholly brownish cupreous from above. Pubescence of 
abdomen white on first segment and anterior portions of 
second, yellow on rest of second and all of third, and black 
on fourth. Bright green of pectus extending over first and 
second segments of venter. Legs black; femora shining 
dark green on underside; tarsi brownish. Wings with 
whole anterior or outer half fuscous yellow, inner half more 
nearly hyaline. 
This species belongs to the obesa group by its coloration 
and absence of prescutellar bristles, but approaches in form 
the amethystina group. 
Phasiida. 
34. Hyalomyia ecitonis, sp. n. 
Nine males and seven females. Paso de Telaya, March 29. 
All taken hovering over the front ranks of a moving army of 
Eectton Foreli, in company with the Stylogasters as described 
in Section I. of this paper (p. 23). 
Length of males 6 to 7 millim., of females 5 to 6 millim. 
6. Front equilateral, not trigonal. Frontal bristles rather 
