fig. 1.—Male fly of A. luminosa on ceiling in Grotto of Waitomo Cave. The tip of the abdomen is characteristically raised above the rest of the body, and the wings are folded over the thorax and anterior part of the abdomen. Photo: S. A. Rumsey. fig. 2.—Two male flies of A. luminosa attempting to copulate with a female fly which has just emerged from a pupa. They are suspended from the ceiling in the Grotto of Waitomo Cave. Photo: S. A. Rumsey. fig. 3.—View of same three flies from opposite side, showing male and female in copula, while other male fly attempts to separate them. Photo: S. A. Rumsey. fig. 4.—Female fly of A. luminosa ovipositing on the ceiling in the Grotto of Waitomo Cave. Photo: S. A. Rumsey.