The Queensland Naturalist. 
Dec., 1923. 
58 
111 the occur vast quantities of ciliated Pro- 
io/.oa, Stentors, dark in colour, resembling animated hats, 
and the [)ale, larger variety of Htentor polymorphus. An 
interesting Hatworm is common, very similar in appear- 
ance to “Mesostoma Ehrenberghii,” and other species 
green, blue, and yellow in colour. Among the Cladocera 
the ordinary ^\'ater flea is abundant, and occasionally a 
stout variety of Daphnia Hyalina, Moina rectirostris, 
8ida cryslalliiia, macothrix laticornis, Alona rectangulata, 
ediydorus sjihericus. Diaptomas, and the ever-present 
Cyclops (piadricornis. In the Ostraeoda, there are var- 
ir-ns siiecies of Cypris. The IJydraclina, or water mites, 
are numerous, both crimson and green, a few belonging 
to the gamus Arrenurus. As is to be expected, the Hemip- 
tera bgure largely. On the surface the little ditch skater, 
"^^'clia currens and Gerris laeustris pursue their games, 
arid occasionally on the edges near the grass, Hydrometra 
stagnorum, with its long, hair-like legs, is found shelter- 
ing itself, while in the middle de[)ths the water boatman 
8lid(‘s along on his hack, taking deadly toll from unwary 
passengers. From the bottom may he fished the preda- 
ceous Kanatra linearis, as well as the Corixa and Nau- 
cerides. Xiimerous specimens of Dijiterous larva can be 
seen in fnvouraiile eohdilions from the noedle-like young 
of the ( Vratopogoii. Gorethra plumicornis. In the 
ij[)ii(miera, dragon Hies, both large and the smaller Demoi- 
selles. The Trichoptera. or caddis Hies, are not so numer- 
ous, as in the Howing waters of the creeks; hut many 
varieties are found, carrying their curiously-built houses 
on their backs. 
REQUEST FOR EXCHANGES. 
We have received a letter from the Director of the 
Southwest Museum of Los Angeles. (California, stating 
that the Museum desires to exchange specimens of diurnal 
h pid(>])tera of the Western United States for examples 
from Australia, (’ollectors desirous of opening exchange 
relations should write to Dr. John Comstock. Director, 
Southwest Museum, 4699 Marmion Way, Los Angeles, 
Califoruia, United Slates America. 
