Belongs within: Bombyliidae.
The Toxophorinae are a group of slender bee flies with a more or less humped thorax. In the genus Toxophora, the pronotum is well developed and strongly bristled, and the proboscis is at most as long as the head. Members of the genera Systropus and Geron have a small pronotum, lacking bristles, and an elongate proboscis, longer than the head (Greathead et al. 2009).
<==Toxophorinae [Systropinae]GEEL09 |--Dolichomyia gracilisH81 |--Toxophora [Toxophorini]GEEL09 | |--T. amphiteaKME08 | |--T. maculataL49 | |--T. varipennisGEEL09 | `--T. virgataGEEL09 |--Systropus [Systropodini]GEEL09 | |--S. acutusGEEL09 | |--S. columbianusGEEL09 | |--S. flavoornatusCM91 | |--S. macerKME08 | `--S. rogersiGEEL09 `--Geron [Geroninae, Gerontini]GEEL09 | i. s.: G. albariusH81 | G. gibbosusL49 | G. holosericeusGEEL09 | G. rufipesGEEL09 |--G. (Geron)KME08 | |--G. (G.) prosopidisKME08 | `--G. (G.) vitripennisKME08 `--G. (Empidigeron) calvusKME08
*Type species of generic name indicated
References
[CM91] Colless, D. H., & D. K. McAlpine. 1991. Diptera (flies). In: CSIRO. The Insects of Australia: A textbook for students and research workers 2nd ed. vol. 2 pp. 717–786. Melbourne University Press: Carlton (Victoria).
[GEEL09] Greathead, D. J., N. L. Evenhuis & C. J. Einicker Lamas. 2009. Bombyliidae (bee flies). In: Brown, B. V., A. Borkent, J. M. Cumming, D. M. Wood, N. E. Woodley & M. A. Zumbado (eds) Manual of Central American Diptera vol. 1 pp. 565–576. NRC Research Press: Ottawa.
[H81] Hall, J. C. 1981. Bombyliidae. In: McAlpine, J. F., B. V. Peterson, G. E. Shewell, H. J. Teskey, J. R. Vockeroth & D. S. Wood (eds) Manual of Nearctic Diptera vol. 1 pp. 589–602. Research Branch, Agriculture Canada.
[KME08] Kits, J. H., S. A. Marshall & N. L. Evenhuis. 2008. The bee flies (Diptera: Bombyliidae) of Ontario, with a key to the species of eastern Canada. Canadian Journal of Arthropod Identification 6: 1–52.
[L49] Lucas, H. 1849. Exploration Scientifique de l’Algérie pendant les années 1840, 1841, 1842 publiée par ordre du gouvernement et avec le concours d’une commission académique. Sciences physiques. Zoologie. II. Histoire naturelle des animaux articulés. Troisième partie. Insectes (suite). Imprimerie Nationale: Paris.