1952] 
Bellinger — Isotomidae 
25 
Salmon, J. T. 
1948. Collembola from the Three Kings Islands with a description 
of Proisotomina, new genus. Rec. Aukland Inst. Mus., 3:291-300. 
Stach, J. 
1947. The apterygotan fauna of Poland in relation to the world 
fauna of this group of insects. Family Isotomidae. Acta 
Monogr. Mus. Hist. Nat., Polish Acad. Sci. Letters. 
Mystrium in Australia (Hymenoptera: Formicidae). 
On July 8, 1951, in the company of Mr. William Bateman, 
Forest Officer for the Northern Territory of Australia, I 
collected three workers of Mystrium camillae Emery at 
the Howard River, north of Howard Springs, Northern 
Territory. This locality, southeast of Darwin, bears vege- 
tation of the type known as “tail open monsoon forest,” 
made up of the co-dominant trees Eucalyptus miniata and 
E. tetradonta , with cycads and various tall grasses con- 
spicuous in the understories. The ants were found be- 
neath a dry log very close to a termite colony. They lay 
feigning death for at least thirty seconds before being 
put into alcohol. 
The particular log from which the collection was made 
lay near, but not within, gallery forest of the type common 
along watercourses in the Darwin area. In such forest are 
found many species of Indomalayan trees growing close 
to the permanent moisture ; these belong to such widespread 
genera as Terminalia, Pandanus, etc., and are intermingled 
with large specimens of the paperbark, Melaleuca leuco- 
dendron. (I am grateful to Mr. Bateman for the botanical 
information here greatly condensed.) This is the first 
time the genus Mystrium has been taken in the Australian 
region. M. camillae has been taken at several points in 
southeastern Asia, from Burma through the East Indies 
and the Philippines, and is the sole species found in this 
area. Several closely related species of the M. mysticum 
group occur on Madagascar. — William L. Brown, Jr., 
Museum of Comparative Zoology, Harvard University. 
