350 Mr. Walker on the British Chalcidites. dance on Tresco, one of the Scilly islands, by Miss White of that place. Mr. Woods has gathered Brassica Cheiranthus on the sands near Penard Castle, near Swansea ; and Potamogeton plantagineus exists in Sir J. E. Smith's herbarium, gathered by Mr. D. Turner, at Diss, in Norfolk, and Dr. H. Thompson, in the south of Scotland. In the herbarium of Dr. Johnston, of Berwick, is a specimen ob-tained by Dr. R. D. Thompson in Ferny Rig marsh, Berwickshire, and I possess a sample of it, gathered by myself in Bottisham fen, Cam-bridgeshire. In all these cases the plant has been referred to a wrong species, but was suspected to be distinct by Dr. R. D. Thompson. I have lately gathered Atriplex rosea on the coasts of Holy Island (Lindisfarn), Berwick, and the Forth near Newhaven, and Mr. Borrer has sent it to me from the Sussex coast. St. John's College, Cambridge, Oct. 27, 1838. XLI. — Descriptions of British Chalcidites. By Francis Walker, F.L.S. [Continued from p. 205.] Sp. 36. Cirr. Cyrrhus, Fern. Cyaneus, antenna nigra, pedes cyanei, tarsi fulvi, protibice fiavcR, alee limpidce. Obscure cyaneus : oculi et ocelli rufi : antennas nigrae ; articulus l us ni-gro-cyaneus : pedes cyanei ; trochanteres fulvi ; genua flava ; tarsi fulvi, basi flavi, apice fusci ; propedum tibiae flavae extus fulvo vittatae, tarsi pallide fusci : alae limpidae ; squamulae fuscae, antice cyaneae ; nervi fusci. (Corp. long. lin. | ; alar. lin. 1 .) June, near London. Fern. Corpus gracillimum, sublineare, nitens, scitissime squameum, parce hirtum : caput transversum, breve, convexum, thorace latius : antennae graciles, extrorsum crassiores, corporis dimidio longiores ; articulus l" s gra-cilis, sublinearis ; 2 US longicyathiformis ; 4 US 3° brevior ; 5" s adhuc brevior ; clava fusiformis, acuminata, articulo 5° plus dimidio longior : thorax longi-ovatus, convexus : prothorax brevissimus, supra vix conspicuus : mesotho-racis scutum latitudine longius; parapsidum suturae bene determinatas ; scu-tellum breviconicum, metathorax transversus, mediocris : petiolus brevissi-mus: abdomen longi-fusiforme, thorace multo longius, supra planum, subtus carinatum, apice acuminatum : oviductus exertus, brevis : pedes graciles : alis nervus ulnaris humerali longior, radialis vix ullus, cubitalis sat longus. Sp. 37. Cirr. Mycerinus, Fern. Ci/preus viridi-varius, antenna fuscce, pedes fulvi ; alie limpidce. Nigro-cupreus : oculi et ocelli rufi : antennae pallide fuscag, subtus fulvae : thoracis latera viridi-varia : oviductus vaginae nigrae : pedes fulvi ; coxae
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