Philhelius are moderate to large hoverflies, most are somewhat wasp like. Little is known of their biology.[1][2] Prior to 2018, they were known under the genus name Xanthogramma, a junior synonym.[3]
^Stubbs, A.E.; Falk, S.J. (1983). British Hoverflies: An Illustrated Identification Guide. British Entomological & Natural History Society. pp. 253, xvpp.
^Evenhuis NL. Nomenclatural studies toward a World List of Diptera genus-group names. Part VI: Daniel William Coquillett. Zootaxa. 2018 Feb 18;4381(1):1-95. doi: 10.11646/zootaxa.4381.1.1. PMID: 29689947
^ abcHuo, K.-K.; Ren, G.; Zheng, Z. (2007). Fauna of Syrphidae from Mt. Qinling-Bash in China (Insecta: Diptera) (in Chinese and English). Beijing: Beijing Huonzheng Printer Ltd Co. pp. 1–512.