PROCEEDINGS OF SCIENTIFIC SOCIETIES. 37 
common for the left side to belong to the female sex, and that in fourteen 
out of twenty-three instances of perfect hermaphrodites cited by Burmeister 
this was stated to be the case, and only in nine instances out of the twenty- 
. three did the female characters and organs appear on the right side. 
Mr. J. W. Douglas exhibited the following insects :— 
1. An example of Polyphylla Fullo, Linn., which flew on to a steam 
vessel at Antwerp in August, and was thus brought to London. 
2. A specimen of Tettigometra impressopunctata, Duf. (a rare species, 
and the only representative of the genus in Britain), which was taken 
casually, on October Ist, at Sanderstead Downs, this being the fourth 
recorded locality in this country. 
8. An example of Typhlocyba debilis, Doug., taken at the same time and 
place as the last-mentioned; also 7. tenerrima, H.-Scht., its nearest ally, 
to show the difference of the species. 
Mr. W. ©. Boyd exhibited a larva of Pieris rape, which had been 
attacked by Microgaster. (See Proc. Ent. Soc., July 5th, 1875, and 
December 6th, 1876.) 
Prof. Westwood read notes on new exotic lamellicorn Coleoptera, and 
exhibited specimens of Calomelopus Nyasse and Amblyodus Nicaragua, 
also drawings of these beetles and of Va algus furcifer, Sumatra; Nicagus 
obscurus, North America; Cyclidius velutinus ; Cremastocheilus crassipes, 
California; and Pantodinus Klugii, Guatemala. 
Prof, Westwood, apropos of Mr. Wood-Mason’s discovery of stridulating 
apparatus in scorpions, announced to the Society at the September meeting, 
called the attention of the Society to a letter in ‘ Nature’ (Nov. 1st, 1877, 
p- 11), from Mr. J. Saville Kent, on a sound-producing crustacean. 
Mr. Wood-Mason remarked that structures in Crustacea, some of which 
certainly, and all of which probably, are for the production of sounds, were 
first brought to notice by Hoffmann,—in V. der Decken’s ‘ Reisen in Ost- 
Africa (Crustaceen)’—but had been independently observed by himself in a 
number of species during his dredging excursion to the Andaman Islands 
in 1872. They were paired organs, as in Scorpions, the Mygale, and the 
Phasma to be brought to notice that night—that is to say, organs working 
perfectly independently of each other were on each side of the body. 
Mr. Wood-Mason then announced the discovery of stridulating organs in 
Phasmida, in a species of Pterinoaylus, and in illustration of his remarks 
exhibited an impression of Westwood’s plate of Serville’s species, P. diffor- 
mipes. Here, as in Crustacea and some other Arthropods, an apparatus 
working perfectly independently of its fellow was developed on each side of 
the body. The rough prominent basal portion of the costal nervure of the 
wings formed the rasp, in connection with which was developed a large oval 
“speculum,” “ tale-like spot,” or “ mirror.” The rasps were scraped by the 
sharp and hard front edges of the tegmina, the dome-like form of which 
