250 Mr. Curtis on the Nests of two Hymenopteroas Insects of Brazil, 



but as I consider the singular furcate structure of the masculine antennae, 

 combined with the variations in the palpi and neuration of the wings, suf- 

 ficient grounds for dividing this extensive group into genera, I have already 

 adopted the genus Schizocerus of Latreille*, to which our insect is most nearly 

 related. If, however, the form of the palpi be of any value in generic characters, 

 it will be impossible to include it in that genus, which is strictly the European 

 type ; I am, therefore, constrained to distinguish it by a new appellation, and 

 I propose calling it 



Dielocerus, Curt. 



Antennce articulo 3tio in mare furcato, piloso ; in fcemina simplici. Tibiae 

 ante apicem espinosse. Clypeus profunde emarginatus. Labrum orbicu- 

 lare (fig. a). Mandibulce graciles acuta?, altera denticulo interno minuto 

 (b). Maxilla? subsequaliter bilobse (c). Palpi mediocres, 6-articulati, 

 articulis tribus basalibus eequalibus, secundo tertioque crassis, quarto 

 paulo minore, quinto omnium minimo quadrato, sexto gracili, haud reli- 

 quis longiore (d). Mentum subsemiovatum (e). Palpi tuberculis promi- 

 nentibus affixi, breves, crassi, 4-articulati, articulo secundo latiore, tertio 

 omnium gracillimo longitudine primi (/). Labium latum, trilobum (g). 



If the above characters be compared with those of Schizocerus furcato*, the 

 typical species of that divisionf, they will be found to differ so essentially, that 

 it is scarcely possible to include them in the same genu*.. 



1 . Dielocerus Ellisii, n. s. 



Mas nigro-violaceus, antennis furcatis ; articulis basalibus collari facie pedi- 

 busque rufis, tarsis posterioribus fuscis ; articulis basalibus albidis, alis 

 hyalinis. 



Femina rufa, abdomine nigro-violaceo, alis hyalinis, basi fascifi media apiceque 

 nigris, tibiis tarsisque posticis fuscis basi albidis. 



Description.— Violaceous-black ; face, the entire pectus, including the collar, ferrufrinou^- 

 orange : abdomen with the centre of the segments rugose from being deeply striated : 

 basal joint of antennae and legs ochreous ; hinder tarsi blackish, the basal joint whitish, 



* Cryptus, Leach and in Curtis's Brit. Ent., fol. and pi. 58. 

 t Curtis's Brit. Ent., fol. and pi. 58. 



