A new genus of the subfamily Coelotinae F.O. Pickard-Cambridge, 1893, Sinodraconarius gen. n., with four new species, S.cawarongensis sp. n. (♂♀), S.muruoensis sp. n. (♂♀), S.sangjiuensis sp. n. (♂♀, type species), S.yui sp. n. (♂♀) and S.patellabifidus (Wang, 2003) comb. n., ex. Draconarius Ovtchinnikov, 1999 is described. The genus is restricted to Southwest China. Sinodraconarius gen. n. is most similar to Draconarius but can be distinguished by the shape of the copulatory organs. The DNA barcodes of all species were documented for future use.

The mitochondrial genome of Ectophasia roundiventris (Loew, 1858), the first representative of subfamily Phasiinae, was sequenced and annotated. So far, there are four Tachinidae mitochondrial genomes, here, all of them are used in Neighbour-Join and Maximum Likelihood analyses. The nucleotide composition of Ectophasia roundiventris mitochondrial genome was 40.4% of A, 39.0% of T, 11.8% of C, 8.8% of G, 79.4% of A + T content. The codon ATG was the most popular start codon. The conservative stop codon was TAA, COX2, and ND5 terminated with an incomplete stop codon T, while the gene ND4 was ended with stop codon TA.

A new genus of the subfamily Coelotinae F.O. Pickard-Cambridge, 1893, Guilotes Z. Zhao & S. Li, gen. n. from China is described, as well as four new species: G.ludiensis Z. Zhao & S. Li, sp. n. (♂♀, type species), G.qingshitanensis Z. Zhao & S. Li, sp. n. (♂♀), G.xingpingensis Z. Zhao & S. Li, sp. n. (♂♀) and G.yandongensis Z. Zhao & S. Li, sp. n. (♀). The DNA barcodes of all species are documented for future use.

House flies (Muscidae) comprise the most species-rich family of the muscoid grade with over 5000 described species worldwide, and they are abundant in various terrestrial and aquatic ecosystems. The high number of species, varied appearances, complex feeding habits, and wide distributions have hindered researchers from understanding their phylogeny and evolutionary history. Here, we newly sequenced fifteen mitochondrial genomes and reconstructed the phylogenetic relationships and divergence time among eight subfamilies of Muscidae (Diptera). The best phylogenetic tree, which was inferred by IQ-Tree, recovered the monophyly for seven out of eight subfamilies (except for Mydaeinae). Based on phylogenetic analyses and morphological characteristics, we prefer the subfamily status of Azeliinae and Reinwardtiinae, and separate Stomoxyinae from Muscinae. Genus Helina Robineau-Desvoidy, 1830 was synonymized with Phaonia Robineau-Desvoidy, 1830. The divergence time estimation indicated Muscidae originated at 51.59 Ma (early Eocene). Most subfamilies had originated around 41 Ma. We provided a mtgenomic viewpoint on the phylogenetic relationships and divergence time estimation of Muscidae.

Tachinid specimens (Diptera, Tachinidae) from Yintiaoling National Nature Reserve, Chongqing, Oriental China were collected and examined, two species are recognized and new to science, Billaea yintiaoling sp. nov., Leskia flavitugula sp. nov., and L. miranda Mesnil is newly recorded for China. Here their descriptions, illustration and keys to species of Chinese species of Billaea and Leskia are provided. The specimens in this study are kept in the Insect Collection, Shenyang Normal University, China (SYNU).

During our studying of the fauna of Tibet, China, many specimens of the subfamily Tachininae (Diptera, Tachinidae) were collected and examined. Three species are described here as new to science, Leskia latisurstylasp. nov., Trichoformosomyia cuonaensissp. nov., and Tachina jilongensissp. nov., and two species, Nemoraea javana (Brauer & Bergenstamm, 1894) and N. echinata Mesnil, 1953, are newly recorded from Tibet. In addition to their descriptions, illustrations, and diagnoses, three identification keys are provided. The specimens in this study are kept in the Insect Collection of Shenyang Normal University, China (SYNU).