468 CHARACTERS OF SOME UNDESCRIBED 



nervis dilute fuscis, squamulis fusco-ferrugineis. (Long. corp. 

 1 lin. ; alar. 2 i.) Caput thoracis, &c. — (ut antea, descrlplionis 

 ulterioris his emendatis,) — Oculi pilis raris subtilissimis erectis 

 consiti : abdomen thoracis fere longitudine et latitudine, ovato- 

 orbiculatum subdepressum Iseve : segmenta dorsi octo, anteriora 

 longitudine subsequalia, posteriora lineari-transvera : primi scutum 

 gracillimum (adhuc gracilius quam Microgastri laterali), apice 

 attenuatura, 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.^ Vespa, &c. 

 Ra?j Ins. 255. 13. 



Art. XLIII. — Characters of some undescribed Neiv Holland 

 Diptera. By Francis Walker. 



Megistocera. — Wiedemann. 



M. dispar. Mas et Fem. Mari antenna: longissim<^, fem. 

 hrevissimcs. Propter femina antennas brevissimas Magis- 

 tocera non bene convenit, at vix genus diversum. 



Mas.— Ferruginea, pubescens : oculi nigro-fusci: palpi nigri : antennae 

 fuscse, pubescentes, corpore fere quadruple longiores ; articuli P*. 

 et 2"^ omnino 3"^ que basi ferruginei : thorax subtus pallidicr : 

 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 : alaj 

 hyalinae, iridescentes, basi et ad costam fusco-flavEe ; 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 : antennae 

 obscure fuscae, capite breviores ; articuli 1^^. et 2"^ ferruginei : 



"' 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 Pisi were wandering about the same places, 

 and to them probably the " Eruca viridis Uneolis albicantibus" of Ray should be 

 referred. Two species of Hemltele.i, aad one oi Pezomachus, were produced in 

 abundance out of these follicles, along with the Microgaster. 



