Microscopical Society. 2891 



sessing but small spiues, moved up and down the inside of the reeds with as much ra- 

 pidity as the larvae. Mr. Westwood said that he had seen cases of a Dipterous 

 insect, probably a Cecidomyia, sticking out of reeds just in the same manner as these 

 Zeuzeraa : they would probably prove to be those of a new species, as this economy was 

 quite new in the history of the genus. 



Mr. F. %mith said that having in former years found Baris laticollis at the roots of 

 Sisymbrium officinale, he searched for it again this season ; but found, instead of those 

 insects, some larva? which he supposed to be those of Leiosoma punctata. He also 

 staled that he had observed attached to the posterior segments of the abdomen of a 

 common Hydrobius a receptacle containing eggs, one of which he had examined mi- 

 croscopically, and found in it a living larva. 



Mr. White read part of a biographical notice of Dr. Leach ; and also a letter from 

 Mrs. Hamilton, in which the capture of a Curculio, probably Acanthothorax longicor- 

 nis, in India, was recorded. 



Mr. Westwood exhibited drawings of the larva and pupa-case of Psyche nigricans, 

 found by Mr. Weaver in the New Forest ; and stated that Mr. Weaver had taken two 

 other species of Psyche new to Britain, — and in Scotland Cetonia amea and Pytho 

 depressns. 



Mr. Westwood exhibited larva; of Lymexylon navale in wood from Pembroke 

 dock-yard, where it had proved very destructive to Italian oak which had been lying 

 there since 1846 : it had been suggested that the wood should be placed in the steam- 

 kiln in order to effect the destruction of these larvae, and this plan was to be tried. 



Mr. Westwood read a portion of a paper entitled ' Notes on Strepsiptera,' and ex- 

 hibited drawings in illustration. 



Mr. Stainton read a description of Micropteryx Aruncella, Scopoli, as an addition 

 to his monograph of the genus. 



The following is an abstract of Mr. Stainton's paper. "In my monograph of the 

 genus Micropteryx I have incorrectly described as Aruncella of Scopoli, a distinct,[but 

 closely allied species; the name to be retained for the insect there described (see p. 30) 

 is Seppella, Fab. In the male Aruncella the fascia is more slender, straighter, and nearer 

 the base than in Seppella ; the entire abseuce of the silver spot towards the apex in 

 Aruncella hardly forming so decided a character, as in many specimens of Seppella it 

 is scarcely visible. Mr. Stephens has specimens from Darenth Wood, and Mr. Thom- 

 son once met with it on the grassy bank between Sydenham and Penge." — H. T. S. 



Proceedings of the Microscopical Society of London. 



June 26, 1850. — De. Arthur Fabre, President, in the chair. 



As it was found impossible to finish the reading of Mr. Williamson's paper " On 

 the Foraminifera " at the meeting of June 12th, it was resolved that the same 

 should be adjourned until this day, when an extra meeting of the Society took place. 

 Mr. Williamson's paper "On the Foraminifera" was concluded; for an abstract of 

 which, see Zool. 2862. 



A paper by the Assistant-secretary, " On the Occurrence of Parasites in Volvox 

 Globator," was read. Mr. Williams stated, that having received on the last meeting 

 from Mr. Rosling some water containing Volvox Globator, upon examining some of 



