468 CHARACTERS OF SOME UNDESCRIBED nervis dilute fuscis, squamulis fusco-ferrugineis. (Long. corp. 1 lin. ; alar. 2|.) Caput thoracis, &c. — (ut antea, descriplionis ulterioris his emendatis,) — Oculi pilis raris subtilissimis erectis consiti : abdomen thoracis fere longitudine et latitudine, ovato-orbiculatum subdepressum laeve : segmenta dorsi octo, anteriora longitudine subsequalia, posteriora lineari-transvera : primi scutum gracillimum (adhuc gracilius quam Microgastri laterali), apice attenuatum, latera membranacea late retecta : sextum ventrale leviter carinatum et apice productum, aculeum subexertum fulciens. Habitat in Spartis scopario. Vol. II. p. 252. Sp. 45. Micr. intricatus. b Vespa, &c. Ray Ins. 255. 13. Art. XLIII.-— Characters of some undescribed New Holland Diptera. By Francis Walker. Megistocera. — Wiedemann. M. dispar. Mas et Fern. Mari antennce longissimce, fem. brevissimce. Propter femina antennas brevissiraas Magis-tocera non bene convenit, at vix genus diversum. Mas. — Ferruginea, pubescens : oculi nigro-fusci : palpi nigri : antenna? fuscse, pubescentes, corpore fere quadruplo longiores ; articuli l us . et 2 US . omnino 3 US . que basi ferruginei : thorax subtus pallidior : mesothorax vittis supra 3 pallidis : abdomen utrinque fusco fas-ciatum, apice obscurius : pedes ferruginei, longi, graciles, pubes-centes, femora et tibiae apice tarsique nisi ad basin fusca : alee hyalinae, iridescentes, basi et ad costam fusco-flavae ; squamulae et nervi flava, hi ad apices plerumque fusci : halteres flavi, apice pal-lide fusci. Fem. — Mari similis at obscurior, thorax angustior, abdomen longius, pedes breviores, alse paullo breviores et angustiores : antenna? obscure fuscae, capite breviores ; articuli l us . et 2 US . ferruginei : b In the course of last autumn, Mr. Curtis and I found the follicles of this species in profusion, attached to springs of heath, grass, &c. in the Western Isles. The caterpillars of Mamestra Phi were wandering about the same places, and to them probably the '' Eruca viridis lineolis albicantibus" of Ray should be referred. Two species of TIemiteles, and one of Pezomachus, were produced in abundance out of these follicles, along with the Microgaster.
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