Mr. Walker on the British Chalcidites. 177 



M. Ehrenberg* considers the separation and isolation of 

 the stomachic vesicles as surprising only to those who have 

 not observed earth worms cut into pieces. These pieces, he 

 observes, let them be ever so minute, contract at each extre- 

 mity in such a manner that but very little of the contained 

 juices escape, and a similar effect is produced by the contrac- 

 tion of the isolated stomachs of the Infusoria. One fact un- 

 doubtedly is more forcible than all arguments ; and I only re- 

 gret that that of a vesicle containing fragments of Oscillatoria 

 has not presented itself several times to the observer ; for with 

 respect to the alleged stomachs without contained aliments, 

 even w hen they appear slightly coloured, the false comparison 

 with the pieces of earth worms wdll not suffice to prove to me 

 that the globules are not part of the gelatinous substance of 

 the Infusoria, since I have frequently seen these globules co- 

 loured, either from their having a tinge of their ow n, or that 

 this effect was the result of an optical illusion or of a phseno- 

 menon of accidental colours. 



XXI, — Descriptions of British Chalcidites. By Francis Walker, 



F.L.S. 

 [Continued from vol. ii. p. 355.] 



Sp. 45. Cirrospilus Murcia, Mas. Cyaneus, abdomen cupreum, antennas 

 nigro-picecB, femora nigra, tibice picece, tarsi fusci, protibicB fulvcp, alee 

 suhlimpidce. 



Obscure cyaneus: oculi et ocelli i*ufi : antennae nigro-piceae ; articuli 1"* 

 et 2"« nigro-cyanei, hie apice piceus ; abdomen cupreum : pedes fusci ; coxae 

 nigrae ; femora nigra ; tibiae piceae ; genua fulva ; propedum femora apice 

 fulva : alae sublimpidae ; squamulae piceae; nervipallide fusci. (Corp. long, 

 lin. f ; alar. lin. 1.) 



Found near London. 



Mas. Corpus sublineare, nitens, scitissime squameum, parce hirtum : caput 

 transversum, breve, convexum, juxta thoraci latum ; vertex sat latus ; frons 

 abrupte declivis : oculi mediocres : antennae filiformes corporis longitudine, 

 pilis longis vestitae ; articulus 1"* gracilis, sublinearis; 2"Mongicyatliiformis ; 

 3US brevis; 4'^, 5"* et 6"^ longi, lineares ; clava longifusiformis, acuminata, 

 articulo 6° duplo longior : thorax ovatus, convexus : prothorax brevissimus, 

 supra vix conspicuus : mesothoracis scutum latitudine loigius ; parapsidum 

 suturae remotse, bene determinatse ; scutellum breviconicum : metathorax 

 transversus, mediocris : petiolus brevissimus : abdomen sublineare, planum, 

 * Die Infusionsthierchen, 1838, p. 361. 



Ann. Nat. Hist, Vol.3. No. 16. ^/fl^/ 1839. o 



