BY ROWLAND E. TURNEH. 217 



Rhagigastek unicolor Guer. 



A^ unicolor Guer., Voy. Coq. Zool. ii. 2, p.214, 1830(1839),^. 



R. hinotatus Westsv., Arc. Ent. ii. 2, p. 105, 1844,(9). 



R, binotatitsSa,uHS., Reised.Nov.Zool.ii. 1 , Hym. p. 111,1807, ((J9)- 



This is the Sydney form of this widely ranging species. The 

 male has the prothorax narrowed in front, the anterior lateral 

 angles not at all pi ominent. Tlie carina at tlie base of the clypeus 

 is well developed and branches near the base, the branches not 

 quite reaching the anterior margin. Tlie clypeus between the 

 branches is shining, sj)arsely punctured. The wings are more 

 strongly suffused with violet than in the southern forms. 



The female has the head longer than wide, slightly rounded at 

 the posterior angles, and the median segment is rather long and 

 not very strongly broadened from the base to tlie apex. The 

 whole insect is black, except two large luteous spots on r,he front, 

 which are often confluent. Sometimes the legs are fuscous. 



Hah. — Sydney. 



R. UNICOLOR Guer. st. mandibularis Westw. 



RJiayigasler mandibularis Westw., Arc. Ent. ii. 2, p.105, 1844 

 ((J9); Sauss., Reise d. Nov. Zool. ii. 1, Hym. p.lll((J). 



The male differs very slightly from the typical^. unicGlor, but 

 has the anterior mat gin of the prothorax more raised and the 

 lateral angles slightly prominent. The shining space on the 

 clypeus, between the carin?e, is more strongly punctured. 



The female has the head as broad as long, the posterior margin 

 almost straight, the median segment strongly broadened from the 

 base to the apex, and the spots on the front ai'e ferruginous-red, 

 as are also the mesothorax, median segment, and coxse. 



Hah. — Liverpool, Shoalhaven, Mittagong, N. S.W.; Gippsland, 

 Vic. 



Saussure gives Sydney as a locality, but I think he is probably 

 mistaken, thousrh the form occurs a little to the w^est. 



