Mr. Walker on the British Chalcidites. 415 



preaches 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, audit 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. 1 82.] 



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

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



Mas. Viridi-cyaneus : oculi et ocelli rufi : antennse nigrsB ; articuli 1"« et 

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

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

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



Fern. Cyaneus: antennae nigro -piceae ; articuli 1"* et 2"* cyanei : pedes 

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



Far. /8. Fern. — Meso- et metatarsi fusci, basi fulvi. 



Var.y.Fem. — Abdomen cyaneo-varium : pedes nigro-cyanei; trochan- 

 teres picei ; genua flava ; tibiae piceae ; tarsi fusci ; protibiae fuscae, basi su- 

 pra fulvse. 



Var, 8. Fem. — Obscure viridis : antennae nigro-picese ; articuli I"* et 2"« 

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

 fusci ; protarsi obscuriores. 



Found near London. 



Fem. Corpus sublineare, nitens, scitissime squameum, parce hirtum ; ca- 

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

 corporis dimidio breviores ; articulus 1"* gracilis, sublinearis ; 2"^ longicya- 

 thiformis ; 4"* 3° brevior ; 5"^ adhuc brevior ; clava fusiformis, acuminata, 

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

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

 apsidum suturae bene determinatse ; scutellum brevi-conicum : metatliorax 

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



