Mr. Walker on the British Chalcidites. 415 



proaches nearer to Nepenthes, where the dehiscence of the 

 operculum and of the pitcher is also horizontal or very nearly 

 so. Only here the operculum continues, whilst elsewhere it 

 is removed. 



B. The polyphyllous ascidia are formed of several leaves. 

 Up to the present time diphyllous alone have been observed, 

 but the study of the conditions in which they arise evidently 

 proves that there is great probability of our finding triphyllous, 

 tetraphyllous, pentaphyllous, and in short polyphyllous, espe- 

 cially in plants where the leaves are verticillate. 



It is thus that a just appreciation of things anticipates ulte- 

 rior discoveries, and it is the best proof that a science of obser- 

 vation is quite as exact as a science of calculation. 



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



F.L.S. 



[Continued from p. 182.] 



Sp. 59. Cirrospilus Rapo. Viridis aut cyaneus, abdomen cupreum, an- 

 tennce nigrcs aut picece, pedes picei, tarsi pallidiores, femora cyanea, alee 

 limpidce. 



Mas. Viridi-cyaneus : oculi et ocelli run" : antennae nigrae ; articuli l us et 

 2 US nigro-cyanei : abdomen nigro-cupreum : pedes picei ; coxae virides ; ge- 

 nua fulva ; tarsi flavi, apice fusci ; propedum tibiae fuscae, tarsi fulvi : alae 

 limpidae ; squamulse piceae ; proalis nervi fusci, metalis fulvi. 



Fern. Cyaneus: antennae nigro -piceae ; articuli l us et 2 US cyanei: pedes 

 coxis et femoribus nigro-cyaneis. (Corp. long. lin. -§-; alar. lin. 1.) 



Far. /3. Fern. — Meso- et metatarsi fusci, basi fulvi. 



Far. y. Fern. — Abdomen cyaneo-varium : pedes nigro-cyanei ; trochan- 

 ters picei ; genua flava ; tibiae piceae ; tarsi fusci ; protibiaa fuscae, basi su- 

 pra fulvae. 



Far. 5. Fern. — Obscure viridis : antennae nigro-picese ; articuli l us et 2 US 

 virides : abdomen cyaneo-cupreum ; trochanters fulvi, tarsi fulvi, apice 

 fusci ; protarsi obscuriores. 



Found near London. 



Fern. Corpus sublineare, nitens, scitissime squameum, parce hirtum : ca- 

 put transversum, breve, convexum, juxta thoraci latum : antennae clavatae, 

 corporis dimidio breviores ; articulus l us gracilis, sublinearis ; 2 US longicya- 

 thiformis ; 4 US 3° brevior ; 5 US adhuc brevior ; clava fusiformis, acuminata, 

 articulo 5° duplo longior : thorax brevi-ovatus, con vexus: prothorax brevis- 

 simus, supra vix conspicuus : mesothoracis scutum latitudine longius ; par- 

 apsidum suturee bene determinatse ; scutellum brevi-conicum : metathorax 

 transversus, mediocris : petiolus brevissimus : abdomen longiovatum, tho- 



