116 THE ENTOMOLOGIST. 
exhibited (1) a hermaphrodite ant, Myrmica levinodis, cap- 
tured by Mr. J. Chappel, at Dunham Park, Cheshire: this 
insect combines characters of male, female, and worker. 
(2) Specimens of Coluocera Atte, Kraatz, described in 
‘Berliner Entomologische Zeitschrift, 1858, found by Mr. J. 
Traherne Moggridge, at Mentone, in the seed-magazines of 
Aphenogaster (Atta) Structor. With reference to the latter 
Mr. Moggridge writes as follows:—“I have lately been 
exploring a very large and far-spreading nest of Atta Structor, 
and I find in the abundantly-filled granaries great numbers 
of the small beetle which I enclose. Platyarthrus is also very 
common in the nests. I have never observed this beetle 
elsewhere, and I do not think it would have escaped me if it 
had been at all abundant in the nests of Atta barbara. I have 
opened but few nests of A. Structor, owing to their being 
usually placed either in terrace-walls or in garden-ground. 
I spend a great deal of my time now in digging for seeds in 
ants’-nests, as I want these seeds for the experiments I am 
making, in the hope of learning the secret method by which 
the ants can at will render their seeds dormant in damp soil. 
I am much struck by the frequent occurrence of the nests of 
trap-door spiders in the very soil of the ants’-nests, the 
spider’s tubes often running quite close to, and in the midst 
of, the galleries of the ants. Ants certainly form a large part 
of the food of trap-door spiders, and this helps me to under- 
stand how it comes that the spiders can get a living without 
leaving their nests. The spider sits watching at the mouth 
of her tube, with the door raised very slightly, and then 
snatches in any insect that may chance to pass within 
reach.” 
Colorado Potato-Beetle.—The Secretary read some remarks 
taken from the ‘Times’ and ‘Gardener’s Magazine’ on the 
rapid progress of the Colorado potato-beetle (Doryphora 
decemlineata) through the United States and Canada, and 
the remedy of Paris green, which was stated to have been used 
with success by the farmers in Canada. The fifteen-spotted 
ladybird was mentioned as a powerful enemy to the potato- 
beetle, devouring it in the larva-state. The writer in the 
‘Times’ suggested the encouragement of small birds as the 
best security against the pest; but, as it had been stated that 
the insects when crushed produced blisters on the skin, 
