This is a vintage scientific illustration of an insect, likely a fly, presented in a detailed drawing. The insect is depicted in a side view, showcasing its anatomy. It has a slender body with a distinct head, thorax, and abdomen. The abdomen appears segmented and has a lighter coloration compared to the rest of the body. The insect has six long, delicate legs and a pair of large, transparent wings with visible veins. It also has antennae extending from its head. The illustration is done in black and white, with fine lines and shading to create detail. Below the image, there is text that reads 'FIG. 27. RHYNGIA.' and 'x 18.' indicating the figure number and magnification.