60 



leaf upon which she intends to deposit her eggs. This use looks 

 as though the powder might have some protective value. 



Mr. C. B. Williams said that the powder was a wax}- secretion 

 of the body, which fell on the wings and was always coming off. 

 As to its utility, he could only note that other insects such as 

 Coniopteryx were quite helpless when placed in it. He stated that 

 the Aleiirodes were frequently parthenogenetic. 



The rest of the evening was given up to the exhibition of objects 

 under the microscope. 



Dr. Chapman exhibited the androconia of At/riades themites. 

 He said that there were two different forms of androconia, the 

 smaller one peculiar to the second or summer brood, the larger 

 found in the first or spring emergence and also in the single 

 brooded race of the species. He noted that the androconia of the 

 spring brood had a close resemblance to those of Poh/oiiniiatns 

 eaclieri, while those of the summer- emerged form were very similar 

 to the androconia of Poli/oiiDiiatita icarits. 



Mr. West (Ashtead) exhibited imagines of the beautiful Aleurodes 

 species previously referred to by Mr. Step. 



Mr. R. Adkin showed lepidopterous subjects, including the anal 

 appendages of Pti/c/iolnnia lecheana, exhibiting the beautiful hair- 

 like structures proceeding from their extremity ; also portions of 

 the cocoons of Antlirocera filipendnl<B and Satuniia parunia, demon- 

 strating the silken-thread structure cf the apparently parchment- 

 like substance of which they are constructed. 



Mr. C. B. Williams exhibited British species of the order Protura 

 in which the antennae are completely wanting or extremely minute. 



Mr. Coxhead showed the gall of Cecido)injia salicipoda, Duff., on 

 willow, from Loughton, together with sections showing both larvae 

 and pupae in situ. 



Mr. Ashdown exhibited various species of Coleoptera and Hem- 

 iptera, including Ceiithorrhijnclddius Jtorridits, larva of Jalla duiuosa 

 (British), etc.; and the Swiss Hispa atra. 



Mr. F. Noad Clarke exhibited androconial scales of Pieris 

 brosfficd', the diatom, Araclinoidiscus ehrenben/ii, the desmids, 

 MicraateiiaH, PeniiDii and Cosiiiariiuit ; leaf of the sago palm, 

 Cycas revoluta, showing stomata, and the stellate hairs of the leaf 

 of the water lily, Castalia alba. 



Dr. Chapman showed androconia (battle-dore scales) of Afiriades 

 thersites, demonstrating that in this species they are seasonally 

 dimorphic. In the spring emergence (and when single- brooded) 

 the scales closely resemble those of P. escheri, but in the summer 



