454 THE ZOOLOGIST. 
Prof. Westwood also exhibited the two sexes of Narycius (Cyphonocephalus) 
smaragdulus, sent to him by Mr. James Wood-Mason, having been taken in 
the Nielgherries. One of the males exhibited was of a purple colour. The 
insect had remained almost unique since first described by Prof. Westwood, 
in 1842, in his ‘ Arcana Entomologica’ (vol. 1., p. 115). 
Mr. J. Wood-Mason exhibited the two sexes of Phyllothelys Westwoodi, 
one of the remarkable species of Mantida, as to which he had observed and 
pointed out (in Proc. As. Soc. Beng., August, 1876, and in Aun. and 
Mag. Nat. Hist., 1876) that the females are distinguished by the 
presence either of a well-developed foliaceous frontal horn (as in 
Phyllocrania) or of a great vertical cephalic cone (as in Blepharis 
or Gongylus) from the males, wherein these processes are represented 
by mere rudiments; and stated that a pair of Hestias Brunneriana, 
another of the species in which this interesting and novel kind 
of distinction between the sexes had been observed, was in the 
collection of the British Museum, under the MS. name of Ozypilus 
pictipes. The latter appeared to be a species common in collections; but 
of the former he had hitherto seen but five specimens—three females (one 
a nymph) and two males—all, even the nymph, exhibiting the sexual - 
differences referred to equally and perfectly. The specimens exhibited - 
were, the male from Upper Tenasserim, and the female from Sibsagar, in 
Assam. 
Mr. Mason next exhibited a beautifully executed drawing of the great 
stridulating spider from Assam, Mygale stridulans, in a stridulating attitude. 
This sketch was by Mr. S. E. Peal, who had likewise furnished Mr. sige 
with a detailed description of the habits of the creature. 
Mr. Mason further announced the discovery of stridulating organs in scor- 
pions. While recently working at the anatomy of a species allied to S. afer, 
he had met with structures which, from his familiarity with the analogous 
ones in other Arthropods, crustaceans as well as insects, he had at once 
without hesitation determined to be sound-producing apparatus—even before 
he had found that sounds could be produced by them artificially by rubbing the 
parts together or accidentally in the mere handling of alcoholic specimens. 
He had, however, been enabled to place the matter beyond all doubt; for 
while at Bombay, waiting for the steamer, he had obtained, by a happy 
chance from some Hindustani conjurors, two large living scorpions belonging 
to another species of the same type; these, when fixed face to face on a’ 
light metal table and goaded into fury, at once commenced to beat the air 
with their palps and simultaneously to-emit sounds, which were most 
distinctly audible, not only to himself, but also to the bystanders, above the 
clatter made by the animals in their efforts to get free, and which resembled 
the noise produced by continuously scraping a piece of silk fabric, or, better 
still, a stiff tooth-brush with one’s finger-nails. ‘The species—a gigantic 
