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p. 267-388 : ill., maps ; 26 cm. ; Includes bibliographical references (p. 385-388). ; "Study of abundant new material leads to the recognition of 16 species in the Australian microhylid fauna, all but one endemic, in contrast to 8 previously known. One of 5 Sphenophryne and 6 of 11 Cophixalus are described as new species. Differences between advertisement calls are crucial to distinguishing between members of two pairs of sibling species and are important in diagnosing other species. One species of Sphenophryne inhabiting northern Cape York Peninsula and southern New Guinea is the only microhylid common to both areas. It and its sibling in the Northern Territory inhabit regions with prolonged dry seasons, in contrast to the three remaining species of Sphenophryne which are confined to rainforest in tropical northeast Queensland. One species of Cophixalus occurs in a boulder-jumble area a few kilometers outside the rainforest boundary, whereas the other ten apparently live only in rainforest. Most species of Cophixalus are known only from one or two localities but one -- C. ornatus -- has an extensive range, more than 300 km from north to south. The species of Sphenophryne inhabit leaf litter. Only one Cophixalus is principally a ground dweller, the remaining species being more or less scansorial. Like other genyophrynine microhylids, the Australian species presumably all lay large eggs in sheltered, terrestrial situations. An adult frog, male in the few verified instances, accompanies the eggs, which undergo direct development, producing fully formed froglets. The five species of Sphenophryne include two sibling pairs, with all five species being so similar morphologically that they were taxonomically confused in the earlier literature. The Australian species share no characters clearly apomorphic for the genus, and little can be said as to relationships with the more diverse New Guinean Sphenophryne. Similar mating call structure among the Australian Sphenophryne suggests that they form a monophyletic group, ...