The Genus _Calliphora_ is well represented by several very distinct species of typical “Blow-flies”; but though the common European species, _Calliphora vomitaria_, is said to be common in New Zealand I have never taken it in Australia. _C. villosa_ is our large common blow-fly; it measures about ½ an inch in length; is of a general slate grey colour with the abdomen thickly clothed with fine golden pubescence giving it a bright mottled yellow tint. _C. oceaniae_ is the smaller blow-fly with a steely blue abdomen, the base on either side bearing a dull yellow blotch by which it can be easily distinguished. Both these species are found in the bush and in the house; they lay their eggs on any food they can gain access to; but in the summer, or when they cannot get at food in time, the egg is hatched in the body of the mother and dropped as a living maggot. Some of the bright metallic species also come in this Genus; _C. rufifaces_ is a much smaller bright rich metallic blue fly, with a silvery face, red eyes, and white flaps behind the wings; it, and the much smaller _C. varipes_ with a yellow face and darker tinted body, are common about dead sheep or decaying matter in the interior. [Illustration: Plate XXX.--DIPTERA. Family MUSCIDAE. 1. _Calliphora oceaniae_ (Desv.). Blue-bodied blow-fly. 2. _Calliphora oceaniae_ (Desv.). Maggot. 3. Head segment of maggot, showing mouth hooks. 4. Anal segment of maggot, showing tubercles. 5. Pupa. 6. _Calliphora villosa_ (Desv.). Yellow blow-fly.] [Illustration: _Plate XXX.--DIPTERA._] _Neocalliphora ochracea_ is somewhat thicker and broader than _Calliphora villosa_, and a much rarer species; it is of a general dull reddish brown colour, with the head and thorax darkest. In the Genus _Lucilia_ we have the typical “Bluebottle” flies, which are well represented in this country: _Lucilia sericata_ and _L. caesar_, both of a moderate size and deep metallic green and coppery tints, are widely distributed. _L. tasmaniensis_ is a larger species, measuring under ½ an inch in length; it is of a uniform bright metallic blue, and has a wide range. Family 22. Bot-flies. OESTRIDAE.