86 Mr. E,. E. Turner on Fossorial Hymenoptera. 



Head Bot unusually large : eyes more 

 than twice as far from each other as 

 from the posterior margin of the head . R. frenchii, Turn. 



3. Hind tibia} not perceptibly spinose .... 4. 

 Hind tibipe more or less spinose 5. 



4. Prouotum rounded at the angles ; inter- 



mediate femora yellow ; abdomen 



marked with ferruginous R. tenuiventre, Turn. 



Pronotum transverse, angles well de- 

 fined ; abdomen and intermediate 

 femora black R. eucalypti, Turn. 



5. Abdomen more or less red 6. 



Abdomen wholly black 7. 



6. S[)ines of hind tibife strong ; petiole dis- 



tinctly longer than the second segment R. tricolor, Sm. 

 Spines of hind tibite feeble ; petiole equal 

 in length to the second segment .... R. tricolor imhelle, Turn. 



7. Pionotuni transverse, the angles well 



defined 8. 



Pronotum rounded at the angles 9. 



8 .Wings f usco-hyaline ; a very broad de- 

 pre.*sion from the inner margin of tlie 

 eye nearly reaching the posterior 

 ocelli; basal area of median segment 

 finely and closely punctured R. lejitosrjermi. Turn. 



Wings hyaline, iridescent ; a narrow 

 sulcus from the inner margin of the 

 eye to the posterior ocelli ; basal area 



of median segment rugose R. cygnorum, Turn. 



9. With a broad depi'ession from the inner 

 margin of the eye uearl}^ reaching the 

 posterior ocelli 10. 



Without a depression from the inner 

 margin of the eye towards the poste- 

 rior ocelli . . . .^ R. liltorch. Turn. 



10. Median segment with a longitudinal 

 sulcus; recurrent nervure received be- 

 yond three-quarters from the base of 

 the cubital cell R. alicice, Turn. 



Median segment without a sulcus ; re- 

 current nervure received at about 

 three-fiftlis from the base of the cubi- 

 tal cell . , R. variitarse. Turn. 



Rhopalum macrocephahis, sp. n. 



5 . Nigra ; mandibulis, apice excepto, scape, flagello articulo prime, 

 tuberculis humeralibus, tegulis, coxis anticis subtus, trochanteri- 

 bus, femoribus anticis intermediisqiie, tibiis tarsisque anticis 

 et intermediis, tibiisqne posticis basi flavis ; segmentis abdomin- 

 alibus margine apicali et subtus fusco-ferrugiueis ; alis hyalinis, 

 venis nigris. 



Long. 6 mm. 



$ . Head sbiuing, very large^ longer than broad ; the 



