Biology, immature stages, and systematics of snail-killing flies of the genus Colobaea (Diptera: Sciomyzidae), with overviews of aspects of the tribe Sciomyzini Author Bratt, Albertus D. Author Knutson, Lloyd V. Author Murphy, William L. Author Daniels, Anthony A. 0000-0002-0085-6998 anthonydaniels71@yahoo.com text Zootaxa 2020 2020-08-31 4840 1 1 64 journal article 8606 10.11646/zootaxa.4840.1.1 8389bc68-68da-4a1e-b8ed-b2b65f252a5e 1175-5326 4405544 56993BCA-1A3E-415E-A765-0D55AB3E7A97 Colobaea montana, Knutson & Orth, 1990 Map 11 Colobaea montana has been found only in the state of Montana , USA . With a mostly matt black frons and R 1 terminating considerably basad of the level of crossvein r-m, C. montana is more similar to C. americana , C. nigroaristata , C. punctata , and related species than it is to C. bifasciella and C. canadensis . Colobaea montana is most similar to C. nigroaristata , males of which can be separated readily by the internal structures of their terminalia and most notably the shape of the posterior surstylus (see Rozkošný 1984a ). The shape of the posterior surstylus, short rather than long dorsobasal setulae on the arista, and lack of silvery tomentum along the margin of the eye distinguish C. montana from C. americana , the only other species of Colobaea likely to occur with C. montana . Nothing is known about its biology or immature stages.