( xxii ) 



that it appioxiiii.itt'd towards the position of a single e(^ually 

 conspicuous spot in nii inner series of the other species. 



Professor Poulton also exhibited se\ei"il specimens of 

 ^)iierinthus populi which had been exposed during the jiupal 

 stage to the intense heat of July iUOO. In consequence of 

 this " forcing " the moths emerged towards the end of that 

 month, and were markedly different in coloiu- from the 

 normal, being much paler in tint with less distinct markings, 

 and the red of the hind-wings of a very different shade. 

 They were also suialler, but this effect may have followed 

 from the larva; having been brought up under artificial con- 

 ditions in the Oxford Museum. The moths were derived 

 from the eggs of a single female which was brought to the 

 Hope Department early in June 1900, so that all the im- 

 mature stages had been completed and the final form attained 

 in considerably under two months. 



The Kev. A. E. Eatox exhibited drawings illustrating the 

 wing of Pampterlnus latipennis, Etn. MS., a remarkable 

 Dipterous fly of the Family Psychodidee, from New Guinea, 

 in the collection of the Hungarian National Museum, Buda- 

 pest. This wing is oblong-ovate in form an 1 of extraordinary 

 breadth, being considerably dilated in the areas posterior to 

 the postical vein, and still more .so in the marginal area, which 

 is the broadest of all. The submarginal area at the costa is 

 slightly wider than the full span of the radial fork, and each 

 of them is wider than any of the remaining areas that have 

 not been mentioned above. The short mediastinal vein near 

 its ending in the subcosta is joined by a perpendicular cross- 

 vein to the subcosta, where the wing (deeply concave there- 

 abouts) is crossed by a crease. The axils of the radial and 

 pobrachial forks are nearer to the cross-veins than in Pericoma 

 fusca (sketches exhibited), the type of species to which the 

 New Guinea lly nas most affinity. Both surfaces of the wing 

 are clothed with minute truncate obovate-cuneate imbricated 

 scales inserted in the membrane, as well as in the veins. 

 Pcipers, etc. 

 Professor Lewis Compton Miall, F.R.S., contributed a 

 paper entitled, " On a new cricket of aquatic habits found in 

 Fiji by Professor Gustave Gilson." 



