162 THE ENTOMOLOGIST. 
fore wings and one of the hind wings, were elongated. The other 
hind wing and the wings on the upper side were normal. Mr. 
C. O. Waterhouse sent for exhibition living males and immature 
females of the mammoth scale-insect which infests the M’sasa tree in 
Rhodesia: also a dead example of the fully-grown female scale. 
They are what are known in collections under the generic name 
Monophlebus. The female has been named Lophococcus maximus 
by Mr. Lounsbury.—Mr. EH. A. Butler exhibited one species of Coleo- 
ptera, and five of Hemiptera, recently added to the British Fauna; also 
the unique example of Mymecocoris gracilis, Sahlb., taken by him at 
Fleet, Hants, in August, 1903.—Mr. H. J. Arrow exhibited examples 
of a Cetoniid beetle, Dicronorrhina (subg. Neptunides) manowensts 
Moser, to show injuries of a remarkable character. In all the marks 
were perfectly symmetrical and occupied exactly the same position. 
—Dr. K. Jordan exhibited the polymorphic Papilio lysithous and P. 
hectorides from Brazil, and the models which they imitate. The exhibit 
illustrated a phenomenon observed in various groups of butterflies : 
that a mimetic species is broken up into a number of very different- 
looking individual varieties, which are all specifically the same, while 
the imitated models are specifically distinct from one another. He 
also exhibited both sexes of the peculiar Peruvian butterfly, Styx 
infernalis, described by Staudinger as a Pierid, but certainly an 
Erycinid in the structure of the antenna, thorax, legs, neuration, and 
the egg. Dr. Jordan also showed, on behalf of the Hon. N. Charles 
Rothschild, an Acrotylus which Mr. Rothschild had observed in some 
numbers in the desert on the Upper Nile. The colour of these small 
locusts so closely agrees with that of the sand and the pebbles (also 
exhibited) that, when settled, the insects disappear entirely from 
view.—Mr. J. W. Tutt opened a discussion on the affinities of the 
two Palzarctic species, Plebevus argus, L. (egon, Schiff.; argyrotoxus, 
Brgstr.) and P. argyrognomon, Brgstr. (argus auctorum). After 
giving an account of the confusion in nomenclature, he proceeded to 
explain the structural and superficial differences of the respective 
imagines. It was also remarkable to note that both showed a parallel 
range of varieties in the mountain, plain, and southern forms. Dr. 
T. A. Chapman then gave a demonstration with the lantern, illus- 
trated by many slides, of the structural differences of the two species 
in the larval and imaginal stages, and criticized the opinion expressed 
by Staudinger that argus and argyrognomon have not yet entirely 
developed into separate species. The microscopic preparations 
showed that the “claw” or spine over the front tibize in argus was 
not even represented in rudimentary form in argyrognomon. 
Wednesday, April Tth.—Dr. F. A. Dixey, M.A., M.D., President, 
in the chair.—Mr. R. Shelford exhibited a number of examples of 
mimetic Blattide, the models being Coleoptera, principally Cocci- 
nellide, and Chrysomelide.—Mr. H. M. Edelsten showed some ova 
of Tapinostola fulva (in sitw) laid within the curled leaf of Carex 
paludosa; also a photograph of the anal segments of the female, 
showing the ear-like appendages, from the ventral side. These, when 
not in use, are carried flat, but when the female is going to lay, they 
are folded together and thrust between the curled edges of a leaf to 
force it avart; the fold makes a hollow in which the ova are 
