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The female black flies exhibit pool feeding behaviour where their salivary proteins are injected at the injury site and maintain the blood meal in a fluid state due to the antihemostatic properties present in the saliva. These proteins include anticoagulants (Jacobs et al. 1990, Abebe et al. 1994, 1995, 1996), vasodilators (Cupp et al. 1994), modulators of platelet aggregation as mediated by apyrase (Cupp et al. 1993, 1995) and modulators of the mouse cellular immune response (Cross et al. 1993).
Strictly speaking, vomiting is the regurgitation of stomach contents, and house flies never regurgitate their stomach contents. What they do is technically spitting (or drooling), not vomiting.