92 Mr. R. E. Turnei' on Fossorial Hymenoptera. 



base, the triangular area divided by a longitudinal sulcus. 

 First abdominal segment about equal in length to the 

 second_, the apical half rather strongly swollen ; pygidial area 

 smooth and shining at the apex. Recurrent nervure received 

 just before two-thirds from the base of the cubital cell, at a 

 distance from the apex almost equal to twice the length of 

 the transverse cubital nervure. Hind tibiae swollen and 

 spinose. 



Hab. Yallingup, S.W. Australia ; November. 



This is near R. frenchn, but the petiole is longer and the 

 colour of the legs different. It is also a much larger species. 



Rhopahcm tricolor, Sm. 



Crabro tricolor, Sm. Cat. Ilyni. T5.M. iv. p. 394 (1850). c?- 



Crabro {lihopalum) militaris, Turn. Proc. Zool. yoc. London, p. 523 



(1908). cT. 

 Crabro {Rliojxilum) triccJor, Turn. Proc. Zool. Soc. London, p. 524 



(1908). 5 c?. 



Smithes type is lost, but from a long series of Tasmanian 

 specimens 1 have no doubt there is only one species, and that 

 militaris, Turn., is quite a usual form of the species, the 

 form identilied by me as tricolor being a dark colour-variety 

 found in the mountain-districts of New South Wales and 

 Victoria. 



Huh. Eaglehawk Neck ; February. Mt. Wellington, 

 2200 ft. ; January. 



Also from S.E. Australia. A closely allied form is common 

 in S.W. Australia, but differs in the slightly shorter petiole, 

 in the almost obsolete spines of the hiud tibise, and in the 

 slightly nearer approach to each other of the posterior ocelli. 

 For this form I propose the name Rhopahim tricolor imbelle, 

 subsp. n. 



R. tricolor "was taken fi'cel}'' on Lejitospermum, also 

 burrowing in sandy banks. 



Crabro (subgenus Solenius). 



I use the name Solenius in a wider sense than Ashmead. 

 The Australian species o£ Ci'abro do not fall well into 

 Ashmead's genera, which were founded without the study of 

 any large exotic collection. The species included here in 

 Solenius fall into more than one group of species, but in all 

 the female has the mandibles tridentate, a supraorbital fovea, 

 and a carina on the mesopleurae before the intermediate 

 coxse. C. trident atus and tasmanicus have the clypeus very 



