232 Mr. J. O. Westwood's Descriptions 



versus marginem posticum capitis, omnibus flavis. Antennae 

 piceae, articulis 4 et quinque sequentibus magis castaneis. 

 Mandibulae flavae, dentibus nigris, dextera dentibus 4 asqua- 

 libus acutis, sinistra dente subapicali latiori, denteque prae- 

 cedenti lato truncato (fig. 4 a, mandibulis vero reversis). 

 Palpi maxillares 6-articulati (fig. 4 b) ; palpi labiales 

 articulo ultimo securiformi (fig. 4 c). Antennae graciles, 

 25-articulatae. Thorax niger, dorso antice maculis duabus 

 obliquis flavis, punctis minutis distantibus scutelii alterisque 

 duabus postscutelli apiceque metanoti duabus flavis. Abdo- 

 men nigrum, flavo-fasciatum, fasciis posticis interruptis, apice 

 valde incurvo, segmentum 2dum subtus productum fere atti- 

 gente (fig. 4 d). Pedes fulvi, trochanteribus albidis, femo- 

 ribus basi obscurioribus. Alae parum fuscescentes, costd 

 late castaneo-fuscd. 

 The discovery of a species of this genus in New Holland is of 

 considerable geographical interest, the species hitherto known 

 being natives of North and South America, and Europe. The 

 species also is the most elegant yet discovered. The only indi- 

 viduals hitherto known were obtained in a collection from Moreton 

 Bay by Captain Parry, F. L. S., to whom I am indebted for my 

 specimen. 



I take this opportunity of describing a new genus of Hyme- 

 nopterous insects collected in the East Indies by Captain Boys, 

 belonging to a family hitherto known only as inhabitants of South 

 America and New Holland, but differing from the species already 

 described in several generic particulars. Unfortunately, only a 

 single specimen of the male sex has been hitherto observed, and 

 I am only able, by analogy, to infer that the female when dis- 

 covered will be a wingless insect, considerably smaller than the 

 male. 



Family THYNNID^E. 

 Genus Iswara, Westw. 

 Characteres masculini. Corpus subcylindricum, fere laeve, palli- 

 dum. Caput (fig. 5 a) mediocre, longitudine latius, lateribus 

 rotundatis. Oculi magni, laterales, margine interno fere 

 recto, vix emarginato. Clypeus parum porrectus, parvus, in 

 lobos duos subacutos divisus. Labrum clypeo absconditum. 

 Mandibulce graciles, falcatae, apice acutae, intus versus apicem 



