538 Entomological Society. 



Aulacus hyalinipennis. Niger, facie et articulo V"° antennarum 

 fulvis, alis hyalinis, stigmate nigro, apicefusco, pedihus 4 anticis 

 fulvis, femoribus posticis fuscis, tibiis rufescentibus , tarsis fulvis 

 ^. Long. Corp. lin. 5. Mexico, 



Aulacus ater. Totus ater, alis pallide fuscescentibus, areola externo- 



media plaga parva postica, alteraque minuta cum stigmate connexa 



fuscis $ . Long. corp. lin. 7. Nova Scotia and North America. 

 Aulacus Abbottii. Niger, abdomine versus basin rufo, pedibus rufis, 



alis striga parva versus basin maculaque pone stigmata fuscis ? . 



Long. Corp. lin. 7. Georgia. 

 Aulacus rufus. Rvfus, antennis (basi excepto) et abdominis basi 



nigris, alarum apicefusco. Long. corp. lin. 8. Van Diemen's 



Land. 

 Aulacus cingulatus. Rvfus, antennis piceis, articulo 1^° albo ? . 



Long. Corp. lin. 5|. Swan River, New Holland. 

 Aulacus apicalis. Rufus, capite abdomineque nigris, hoc lunula versus 



basin flavescente, alarum apice lato nigro $ . Long. corp. lin. 5. 



New Holland. 



A detailed description is then given of the genera Megalyra, 

 W., composed of one Australian already described species {M.fascii- 

 pennis) and Trigonalys, both of which, as well as Stephanus, are 

 shown to offer a more intimate relation to the preceding genera 

 than to any other family of Hymenopterous insects. 



Trigonalys, W. (Proceedings of the Zool. Soc, 1835*), is com- 

 posed of the five following species : — 

 Trigonalys melanoleuca, W. (op. cit.). 

 Trigonalys obscura. Nigra, obscura, capite plana, nitido, abdominis 



segmento 1*"^ margine postico luteo, alis obscurh fuscis. Long. 



corp. lin. 7. Surinam. 

 Trigonalys Servillei. Nigra, parte postica thoracis et abdominis 



basi pallide luteis, alis immaculatis hyalinis. 

 Trigonalys Leprieurii (Seminota Lep., Spinola). 

 Trigonalys Hahnii, Spin. (Tr. anglicana, Shk.). 

 The genus Stephanus of Jurine comprises nine species, of which 

 the following are new : — 



Stephanus bicolor. Piceo-niger, capite thoraceque rufis, rugosis, 



oviductu fascia lata alba subapicali, tarsis posticis brevissimis, 



crassis, ferrugineis $ . Long. corp. lin. 9. Georgia. 

 Stephanus Indicus. Niger, gracillimus, antennis basi rufis, facie 



flavo-lineata, tibiis tarsisque basi albidis , petiolo longissimo, alarum 



venis discoidalibus obsoletis (^ . Long. corp. lin. 6^. $ capite 



rufo. Malabar. 



Mr. Waterhouse exhibited and read detailed descriptions of two 



* I consider Lycogaster pullatus, Shk., to be the male of another species 

 ©f Trigonalys.— i . O. W. 



