The present paper contains the descriptions of two new species of mosquitos from North Queensland, Mucidus chrysogaster and Aëdes (Finlaya) mackerrasi. The former, the second Australian species of the genus, is a very interesting and most beautiful insect, of which only the female is so far known ; the latter is also of interest in that it adds yet another species to the closely interwoven group of Australian Finlaya.

My thanks are specially due to Dr. I. M. Mackerras, B.Sc., for his kind assistance in the determination of the latter species, since I was unable to do so myself, as the Institute does not possess a male specimen of Aëdes (Finlaya) occidentalis (Skuse). The comparative notes on the genitalia are from his pen.