Cynorhinella bella, the western longnose, is a species of hoverfly in the family Syrphidae.

"Face chestnut brown, concave below the antennae with a prominent rounded tubercle about the middle, below which it is slightly produced to the not prominent oral margin ; side margins well defined, as in Chilosia, the facial slopes with fine whitish pollen, the side margins with sparse whitish pile ; cheeks and frontal triangle shining, concolorous with the face ; vertical triangle brown, the sides of the triangle about equal, with brown pile ; occiput shining chestnut, with whitish pile below and brownish above.

[1] "Abdomen narrow, and gradually narrowing after the second segment, in color shining blue-black, the posterior margins of the second and third segments a little more blackish on the median two-thirds ; hypopygium black.

Pile of abdomen yellowish on basal angles, becoming white en the hypopygium, and black on the ends of the second and third segments."

Wings distinctly luteous (light to medium greenish tinge) ; stigma yellowish.