( xc ) 



the green insects at the top of the stem as being much smaller 

 than the pink ones below, we now had no reason to doubt 

 that these insects are at times to be found arranged in the 

 manner shown on the plate, notwithstanding that Mr. S. 

 Hinde had never seen them so arranged during the time he 

 had them under observation (see Trans. Ent. Soc, 1902, 

 p. 695). Prof. Poulton's suggestion that the insects are only 

 arranged in the definite way described by Dr. Gregory, just 

 at the period when they have reached the final stage, was in 

 all probability correct, but it had yet to be proved correct ; 

 and in a matter so interesting it was greatly to be desired 

 that someone on the spot would carry out further observations 

 with a few to settling that point. Mr. Distant had described 

 as a distinct species the pink form shown on Dr. Gregory's 

 plate ; but knowing what we did of the close association of 

 the two forms, he thought it was quite evident the two were 

 merely forms of a single species, especially as no difference in 

 structure had been pointed out. 



West African Homoptera. — Mr. W. A. Lamborn exhibited 

 a series of twelve Homoptera of the genus Flata, all taken feed- 

 ing on one plant, 70 miles E. of Lagos, on Dec. 1, 1912. The 

 insects were dimorphic, and he stated that the pink and green 

 forms were mixed as they rested on the plant. He had 

 not observed in these the definite arrangement according to 

 colour mentioned by Mr. Gahan, although he was acquainted 

 with the same species. 



Prof. PoULTON observed that the insect probably had the 

 instinct for congregating, though not of colour-arrangement, 

 and that in the two known instances in which the green 

 specimens were found above and the pink below they had 

 probably come out in that order, and had not yet flown, and 

 that when once disturbed they congregated again, but 

 promiscuously. 



EUCHBLIA JACOBAEAE, L., CAPTURED AND THEN ABANDONED 



BY A Robin. — Prof. Poulton exhibited an apparently un- 

 injured example of E. jacobaeae given him by IMr. Roland 

 Trimen, F.R.S., who had made the following observation on 

 June 20, 1912. The moth was flying slowly at midday in his 

 garden at Fawley, Onslow Crescent, Woking, when a robin 



