30 Mr. C. 11. T. Townsend on Diptera 



This character must be taken as indicating varietal rank, 

 since the hair of front in the other female is whoUj black 

 like that of the males. 



33. Volucella viridana, sp. n. 



One malcj San Rafael, July 7. On flowers of the Cordia sp. 



Length 9^ millim. 



Front, facCj thorax, scutellum, pleuras, and base of 

 abdomen brilliant shining- green, with slight cupreous 

 reflections on the thorax. Antennse 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 naiitlana, 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 on 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 aviethystina group. 



Phasiidse. 



34. Hy atomy ia eciionis^ sp. n. 



Nine males and seven females. Paso de Telaya, March 29. 

 All taken hovering over the front ranks of a moving army of 

 Eciton Forelij 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. 



cJ . Front equilateral, not trigonal. Frontal bristles rather 



