The British Guiana Museum. 241 
order are shewn suspended at the side ; one, a pear- 
shaped nest with an aperture below, and with transverse 
partitions within, each pierced with a central hole to give 
communication throughout (as is seen in the seftion 
exhibited), is especially worthy of observation. 
Of those orders, of which the various members undergo 
an incomplete metamorphosis, several forms are shewn. 
Thus of the group of the grasshoppers (Orthoptera) , forms 
distinguished by the plaited wings, the hinder pairof which 
are very large, and by the biting mouth parts, speci- 
mens are shewn of the running type, as the cockroaches ; 
of the walking type, as the Mantis or praying-insefts and 
the walking-stick insects ; and of the jumping type, as the 
crickets, locusts and grasshoppers. The popularly termed 
(l locusts" are destructive grasshoppers, and specimens are 
shewn of forms from Central Europe, Cyprus, and the 
United States, with colonial forms. The true locusts bear 
a long curved organ at the end of the body. They are 
represented by several forms, among which are the true 
leaf-inse6ls, the front wings of which are strikingly 
leaf-like in form, colour and venation. Of the group 
of the dragon-flies, the may-flies, and termites or white- 
ants (Neuroptera) forms distinguished by the presence 
of four equal, very delicate, membranous, lace-like 
wings, a few representative forms are shewn. Of the 
group of the cicadas and plant-lice, (Hemiptera) forms 
with sucking mouths and w 7 ith the front pair of w T ings 
usually not perfeftly membranous, several specimens are 
shewn. Among them the species of "six o'clock bees'' 
(Cicada) noted for their screech-like noise caused by 
two vibrating elates on the abdomen of the males; the true 
lantern-flies (Fulgora) with their immense globe-like 
