( X 1 
Exhibitions, etc. 
Mr. H. St. John Donisthorpe exhibited a living female of 
Dytiscus marginalis with elytra resembling those of the male 
insect. 
Dr. Sharp said he had seen this form before, but that it 
was very rare in this country, though abundant in some 
other parts of the PalaBarctic region. 
Professor Stewart asked if the genitalia had been examined. 
Mr. Champion stated that Mr. J. J. Walker had collected 
several females of an allied species {Dytiscus circumflexus) at 
Gibraltar with elytra resembling those of the male. 
Dr. Sharp exhibited specimens of Brenthus anclwrago from 
Mexico showing extreme variation in size. He remarked 
that the males varied from 10^ mm. in length to 51 mm. ; 
the female from 9 J mm. to 27 mm. In the male the width 
varied from IJ mm. to 4 mm. The length therefore varied 
from about 5 to 1, and the width from 3 to 1 in the male. 
Mr. Blandford commented on the difficulty of mounting 
minute Lepidoptera, Diptera, Neuroptera, etc., and exhibited 
samples of strips of material which he had found most 
suitable for the purpose of staging minute insects. He said 
his attention had been called to this method of mounting by 
the receipt of specimens from Dr. Fric of Prague. On ex- 
amination of the material he found it to be a fungus, Polyporus 
betulinus. He stated that Lord Walsingham had expressed his 
satisfaction with this material and had sent him specimens, 
similarly mounted, from Zeller's collection. Mr. McLachlan 
remarked that he thought the material exhibited preferable to 
artichoke pith, which had been used for a similar purpose. 
Mr. Goss exhibited a species of a Mantid, Pseudocreohotra 
Wahlbergi, Stal, received from Captain Montgomery, J.P., of 
Mid-Ilovu, Natal. He said he was indebted to Mr. Champion 
for determining the species. 
Mr. F. Merrifield exhibited some Limenitis sibylla, the 
pupae of which had been subjected to extreme temperatures. 
A temperature of 85° to 90° was fatal to most ; in those 
which survived the black ground-colour is pale and freckled, 
and there is some increase in the reddish scales near the apex 
of the forewings and the anal angle of the hindwings ; and on 
