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We propose a novel approach based on the inversion method to eliminate interference in the continuous-wave (CW) terahertz (THz) reflection imaging. Through the study on the imaging window of the CW-THz reflection imaging with the interference mechanism, inverse processing is introduced to realize the interference elimination. Based on the theoretical calculation, high resistivity float-zone silicon (HRFZ-Si) with high refractive index is selected as the imaging window to improve the dynamic range of the THz image. The interference elimination method is verified experimentally by a CW-THz reflection imaging system based on a THz quantum cascade laser (QCL) lasing at 4.3THz. The reflectivities of liquid samples of water and ethanol are restored by the interference elimination method, which corresponds well with the theoretical calculation. Moreover, the interference elimination method is performed on THz images of fresh biological tissues. The image contrast of tissue can be greatly enhanced with the accurate reflective information.

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Biting midges of the genus Culicoides are important in both medicine and veterinary medicine because their blood-feeding regime enable them to transmit a variety of pathogens. In this study, the morphological characteristics of the new species of Culicoides (Sinocoides) jiangchengensis Wang et Liu sp. nov are described and compared with the other species of female Culicoides in the subgenus Sinocoides. Three morphological characteristics of C. jiangchengensis, such as without sensory pit in 3rd palpus segment, sensilla coeloconica on flagellomeres 1,9–13, and m1 and m2 cell of the wings with pale spots, were different from the other nine species of culicoides in subgenus Sinocoides. Genetically, C. jiangchengensis are most closely related to C. malipoensis, but they were located in different branches and the minimum interspecific distance between them was 12.6%. In addition, a checklist of 10 species in the subgenus Sinocoides Chu, 1983 (Diptera: Ceratopogonidae: Culicoides) in China, including the new species C. jiangchengensis Wang et Liu sp. nov., is provided, and an updated key to species of the subgenus Sinocoides Chu, 1983 was presented.

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