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The NEUROPTERA and TRICHOPTERA have 
been little studied in Australia, and, with the exception 
of the large-sized species, are little known, but they are 
certainly rather numerous on the whole, the EPHEMERID&® 
being the least numerous, and the TERMITID& the most so. 
The LEPIDOPTERA form everywhere a very populous 
Order, and nowhere more so than in Australia. It is difficult 
to guess even at their probable numbers; but Mr. Meyrick, 
who has been engaged upon the Microlepidoptera for some 
years, estimates their number at many thousand species. 
The Diurnal Butterflies of Australia consist, according to 
Masters’s Catalogue, of 200 species, but the greatest number 
of these are from Northern Queensland, and are evidently 
originally migrants from the Indo-Malayan region; among 
these may be ranked the magnificent genus Ornithoptera, of 
which four species or varieties are found in Australia. 
The readiness with which some Butterflies change their 
residence is exemplified by the passage of an American 
Butterfly (Danais Erippus, Cram.), of late years from the 
west coast of America to Australia, and its now complete 
voluntary acclimatization in that country. Hurycus is the 
only entirely Australian genus among the Papriionip# ; but 
among the Day-flying Moths there are several, such as 
Synemon, Huschemon, Damias, and Agarista. The SpuHin- 
aipz, Bomsycipm, Noctrurpi#, and GrOMETRIDE are 
numerous, handsome, and many of them of large size. The 
MICROLEPIDOPTERA seem to be in incalculable numbers. Mr. 
Meyrick calculates the GicrrHoripD# alone at 2000 species. 
The DIPTERA 4s also an Order extremely rich in numbers, 
but the smaller and more numerous of the Australian groups 
have never been studied. Schiner, in “The Diptera of 
the Novara,” estimates the Diptera of the world at 19,449 
species, and of these he gives only 1056 to Australia. Three 
times that number would probably be under the mark. The 
CrECYDOMYIDA#, for instance, are very numerous in Australia, 
and yet only three species have been described. 
The Jasantpm, Asitipm, AcrocrERIDH, BomBYLIIDA, 
and Muscip# are very. numerous, and present some local pecu- 
liarities. SyrpHIv#, on the contrary, are rare, and the 
CEsTRIDz are unknown. 
The HEMIPTERA and HOMOPTERA are numerous, 
and most of the families are represented. Of the first of these 
Orders the Repuvi1pz# are the most largely distributed. The 
Hemiptera are not only numerous but are most peculiar 
and interesting; most of the families however, more particularly 
the Coccipm and Psy.uipa#, are almost unknown. 
The Class A R A C H NID /& are numerous proportionally 
to the rest of the world. The PHALANGIIDZ are very few, but 
