Identification: Head: Eyes large in relation to head; Arista with white pubescence. Occiput & frons mostly black Thorax: Black. Wings hyaline Legs: Femorae yellow,
- which describes both leptogaster & nova
Description of C. nova: (Collin, 1944). Resembling C. leptogaster but differing as follows: Male: Frons rather more extensively yellow, this colour usually extending in front to each side-margin and connected to yellow vertex by a band (which may be tawny about middle) as wide as inner vertical bristles are apart. First 2 antennal joints as yellow as third (in leptogaster they are often brownish), third joint smaller than in leptogaster, and arista rather shorter haired. Frontal and thoracic pubescence slightly shorter. There are decided differences in the male genitalia, one of the most conspicuous being in the shape of paralobes or side lamellae; in leptogaster, in profile, they are narrow, more evenly tapering, somewhat downcurved (towards penis), with a downcurved point at tip; in nova they are broader, with an obvious, obtusely triangular, projection near base on posterior side, and end in a bluntly rounded tip having a upcurved small point. Front tibiae with an anteroventral row of very small black excrescences resembling very closely adpressed spines. Female: Basal antennal joints always much yellower and frons even more extensively yellow than in male. Humeri variable in colour but usually more extensively yellow, at least on upper surface. Front tibiae, as in leptogaster ? without any black points. Length: 5-6 mm.
Key: Bygebjerg, R., Munk, T., & Elnif, J. (2011). Chyliza leguminicola Melander, 1920 (Diptera: Psilidae) new to the Palaearctic fauna. Entomologiske Meddelelser, 79(2), 73–84.
The larvae of C. leptogaster have earlier been mentioned producing woody nutlike galls on the stem of Spiraea sp., but the information is questionable (Collin, 1944; Chandler, 1975) "I have not observed any regular plant association which might throw light on its life history." (Chandler, 1975)