Mr. Walker on the British Chalcidites. 415 



proaches nearer to Neperithes, 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 w^hich 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. Viridis aut cyaneus, abdomen cupreum, an- 

 tennce nigrce aut picece, pedes picei, tarsi pallidiores, femora cyanea, alcB 

 limpidcB. 



Mas. Viridi-cyaneus : oculi et ocelli rufi : antennae nigrse ; articuli 1"^ et 

 2"8 nigro-cyanei : abdomen nigro-cupreum : pedes picei ; coxae virides ; ge- 

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

 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. 4 ; alar.^ lin. 1.) 



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



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

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

 pra fulvae. 



Var, 8. Fem. — Obscure viridis : antennae nigro-piceae ; articuli 1"^ et 2"* 

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

 fusci ; protarsi obscuriores. 



Found near London. 



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

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

 coi'poris dimidio breviores ; articulus 1"* gracilis, sublinearis ; 2"* longicya- 

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

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

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

 apsidura suturae bene determinatae ; scutellam brevi-conicum : metathorax 

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



